{"id":5757,"date":"2025-12-24T05:18:00","date_gmt":"2025-12-24T05:18:00","guid":{"rendered":"https:\/\/korea-transmission.com\/?p=5757"},"modified":"2025-12-24T05:18:19","modified_gmt":"2025-12-24T05:18:19","slug":"gb-t-9145-2003-thread-limit-dimensions","status":"publish","type":"post","link":"https:\/\/korea-transmission.com\/it\/blog\/gb-t-9145-2003-thread-limit-dimensions\/","title":{"rendered":"Dimensioni limite filettatura GB\/T 9145-2003"},"content":{"rendered":"

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Introduzione alla norma GB\/T 9145-2003<\/h2>\n

Questa norma specifica le dimensioni limite per filettature metriche di uso generale di media precisione nella serie preferita, garantendo intercambiabilit\u00e0 e prestazioni negli assemblaggi meccanici. Copre filettature a passo grosso e fine per applicazioni interne ed esterne, con tolleranze applicate prima della placcatura per rivestimenti sottili.<\/p>\n<\/div>\n

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Ambito di applicazione<\/h2>\n

La norma GB\/T 9145-2003 definisce le dimensioni limite per le filettature metriche con precisione di tolleranza media e serie preferenziali, applicabili a scopi di ingegneria generale. Garantisce che i profili delle filettature non superino le condizioni massime del materiale definite dai profili di base e dalle posizioni di tolleranza. Ci\u00f2 \u00e8 fondamentale per gli elementi di fissaggio in settori che richiedono un accoppiamento affidabile senza interferenze, soprattutto dopo la placcatura.<\/p>\n

    \n
  • Si applica alle filettature prima di rivestimenti sottili come la galvanizzazione.<\/li>\n
  • Dopo la placcatura, i profili devono rimanere entro le posizioni H o h.<\/li>\n
  • Si concentra su durate di ingaggio medie per un equilibrio tra resistenza e producibilit\u00e0.<\/li>\n<\/ul>\n<\/div>\n
    \n

    Dimensioni limite generali<\/h2>\n

    Nessun punto del profilo della radice della filettatura deve superare il profilo massimo consentito per forma base e tolleranza. Per le filettature placcate, i contorni effettivi dopo la placcatura non devono superare le posizioni H\/h. Ci\u00f2 impedisce un serraggio eccessivo o la rottura degli assemblaggi. Nota: le tolleranze sono adatte a placcature sottili; i rivestimenti pi\u00f9 spessi richiedono delle regolazioni.<\/p>\n<\/div>\n

    \n

    Filettature interne a passo grosso<\/h2>\n

    Per una precisione media, la lunghezza di innesto \u00e8 media. Zone di tolleranza: 5H per d \u2264 1,4 mm; 6H per d > 1,4 mm. Limiti per il diametro del passo D2<\/sub> e diametro minore D1<\/sub> garantire un corretto accoppiamento con le filettature esterne.<\/p>\n

    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Filo<\/th>\nDurata dell'impegno<\/th>\nDiametro del passo D2<\/sub><\/th>\nDiametro minore D1<\/sub><\/th>\n<\/tr>\n
    ><\/th>\n\u2264<\/th>\nmassimo<\/th>\nminimo<\/th>\nmassimo<\/th>\nminimo<\/th>\n<\/tr>\n<\/thead>\n
    M1<\/td>\n0.6<\/td>\n1.7<\/td>\n0.894<\/td>\n0.838<\/td>\n0.785<\/td>\n0.729<\/td>\n<\/tr>\n
    M1.2<\/td>\n0.6<\/td>\n1.7<\/td>\n1.094<\/td>\n1.038<\/td>\n0.985<\/td>\n0.929<\/td>\n<\/tr>\n
    M1.4<\/td>\n0.7<\/td>\n2<\/td>\n1.265<\/td>\n1.205<\/td>\n1.142<\/td>\n1.075<\/td>\n<\/tr>\n
    M1.6<\/td>\n0.8<\/td>\n2.6<\/td>\n1.458<\/td>\n1.373<\/td>\n1.321<\/td>\n1.221<\/td>\n<\/tr>\n
    M1.8<\/td>\n0.8<\/td>\n2.6<\/td>\n1.658<\/td>\n1.573<\/td>\n1.521<\/td>\n1.421<\/td>\n<\/tr>\n
    M2<\/td>\n1<\/td>\n3<\/td>\n1.83<\/td>\n1.74<\/td>\n1.679<\/td>\n1.567<\/td>\n<\/tr>\n
    M2.5<\/td>\n1.3<\/td>\n3.8<\/td>\n2.303<\/td>\n2.208<\/td>\n2.138<\/td>\n2.013<\/td>\n<\/tr>\n
    M3<\/td>\n1.5<\/td>\n4.5<\/td>\n2.775<\/td>\n2.675<\/td>\n2.599<\/td>\n2.459<\/td>\n<\/tr>\n
    M3.5<\/td>\n1.7<\/td>\n5<\/td>\n3.222<\/td>\n3.11<\/td>\n3.01<\/td>\n2.85<\/td>\n<\/tr>\n
    M4<\/td>\n2<\/td>\n6<\/td>\n3.663<\/td>\n3.545<\/td>\n3.422<\/td>\n3.242<\/td>\n<\/tr>\n
    M5<\/td>\n2.5<\/td>\n7.5<\/td>\n4.605<\/td>\n4.48<\/td>\n4.334<\/td>\n4.134<\/td>\n<\/tr>\n
    M6<\/td>\n3<\/td>\n9<\/td>\n5.5<\/td>\n5.35<\/td>\n5.153<\/td>\n4.917<\/td>\n<\/tr>\n
    M7<\/td>\n3<\/td>\n9<\/td>\n6.5<\/td>\n6.35<\/td>\n6.153<\/td>\n5.917<\/td>\n<\/tr>\n
    M8<\/td>\n4<\/td>\n12<\/td>\n7.348<\/td>\n7.188<\/td>\n6.912<\/td>\n6.647<\/td>\n<\/tr>\n
    M10<\/td>\n5<\/td>\n15<\/td>\n9.206<\/td>\n9.026<\/td>\n8.676<\/td>\n8.376<\/td>\n<\/tr>\n
    M12<\/td>\n6<\/td>\n18<\/td>\n11.063<\/td>\n10.863<\/td>\n10.441<\/td>\n10.106<\/td>\n<\/tr>\n
    M14<\/td>\n8<\/td>\n24<\/td>\n12.913<\/td>\n12.701<\/td>\n12.21<\/td>\n11.835<\/td>\n<\/tr>\n
    M16<\/td>\n8<\/td>\n24<\/td>\n14.913<\/td>\n14.701<\/td>\n14.21<\/td>\n13.835<\/td>\n<\/tr>\n
    M18<\/td>\n10<\/td>\n30<\/td>\n16.6<\/td>\n16.376<\/td>\n15.744<\/td>\n15.294<\/td>\n<\/tr>\n
    M20<\/td>\n10<\/td>\n30<\/td>\n18.6<\/td>\n18.376<\/td>\n17.744<\/td>\n17.294<\/td>\n<\/tr>\n
    M22<\/td>\n10<\/td>\n30<\/td>\n20.6<\/td>\n20.376<\/td>\n19.744<\/td>\n19.294<\/td>\n<\/tr>\n
    M24<\/td>\n12<\/td>\n36<\/td>\n22.316<\/td>\n22.051<\/td>\n21.252<\/td>\n20.752<\/td>\n<\/tr>\n
    M27<\/td>\n12<\/td>\n36<\/td>\n25.316<\/td>\n25.051<\/td>\n24.252<\/td>\n23.752<\/td>\n<\/tr>\n
    M30<\/td>\n15<\/td>\n45<\/td>\n28.007<\/td>\n27.727<\/td>\n26.771<\/td>\n26.211<\/td>\n<\/tr>\n
    M33<\/td>\n15<\/td>\n45<\/td>\n31.007<\/td>\n30.727<\/td>\n29.771<\/td>\n29.211<\/td>\n<\/tr>\n
    M36<\/td>\n18<\/td>\n53<\/td>\n33.702<\/td>\n33.402<\/td>\n32.27<\/td>\n31.67<\/td>\n<\/tr>\n
    M39<\/td>\n18<\/td>\n53<\/td>\n36.702<\/td>\n36.402<\/td>\n35.27<\/td>\n34.67<\/td>\n<\/tr>\n
    M42<\/td>\n21<\/td>\n63<\/td>\n39.392<\/td>\n39.077<\/td>\n37.799<\/td>\n37.129<\/td>\n<\/tr>\n
    M45<\/td>\n21<\/td>\n63<\/td>\n42.392<\/td>\n42.077<\/td>\n40.799<\/td>\n40.129<\/td>\n<\/tr>\n
    M48<\/td>\n24<\/td>\n71<\/td>\n45.087<\/td>\n44.752<\/td>\n43.297<\/td>\n42.587<\/td>\n<\/tr>\n
    M52<\/td>\n24<\/td>\n71<\/td>\n49.087<\/td>\n48.752<\/td>\n46.681<\/td>\n45.971<\/td>\n<\/tr>\n
    M56<\/td>\n28<\/td>\n85<\/td>\n52.783<\/td>\n52.428<\/td>\n50.796<\/td>\n50.046<\/td>\n<\/tr>\n
    M60<\/td>\n28<\/td>\n85<\/td>\n56.783<\/td>\n56.428<\/td>\n54.796<\/td>\n54.046<\/td>\n<\/tr>\n
    M64<\/td>\n32<\/td>\n95<\/td>\n60.478<\/td>\n60.103<\/td>\n58.305<\/td>\n57.505<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    Queste dimensioni forniscono indicazioni per la fabbricazione dei dadi, garantendo la compatibilit\u00e0 con i bulloni in condizioni di carico medio.<\/p>\n<\/div>\n

    \n

    Filettature esterne a passo grosso<\/h2>\n

    Precisione media, impegno medio. Zone di tolleranza: 6h per d \u2264 1,4 mm; 6g per d > 1,4 mm. Limiti per diametro maggiore d e diametro primitivo d2<\/sub>, con raggio minimo della radice secondo GB\/T 197-2003.<\/p>\n

    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Filo<\/th>\nDurata dell'impegno<\/th>\nDiametro maggiore d<\/th>\nDiametro del passo d2<\/sub><\/th>\nRaggio minimo della radiceUN<\/sup><\/th>\n<\/tr>\n
    ><\/th>\n\u2264<\/th>\nmassimo<\/th>\nminimo<\/th>\nmassimo<\/th>\nminimo<\/th>\nminimo<\/th>\n<\/tr>\n<\/thead>\n
    M1<\/td>\n0.6<\/td>\n1.7<\/td>\n1<\/td>\n0.933<\/td>\n0.838<\/td>\n0.785<\/td>\n0.031<\/td>\n<\/tr>\n
    M1.2<\/td>\n0.6<\/td>\n1.7<\/td>\n1.2<\/td>\n1.133<\/td>\n1.038<\/td>\n0.985<\/td>\n0.031<\/td>\n<\/tr>\n
    M1.4<\/td>\n0.7<\/td>\n2<\/td>\n1.4<\/td>\n1.325<\/td>\n1.205<\/td>\n1.149<\/td>\n0.038<\/td>\n<\/tr>\n
    M1.6<\/td>\n0.8<\/td>\n2.6<\/td>\n1.581<\/td>\n1.496<\/td>\n1.354<\/td>\n1.291<\/td>\n0.044<\/td>\n<\/tr>\n
    M1.8<\/td>\n0.8<\/td>\n2.6<\/td>\n1.781<\/td>\n1.696<\/td>\n1.554<\/td>\n1.491<\/td>\n0.044<\/td>\n<\/tr>\n
    M2<\/td>\n1<\/td>\n3<\/td>\n1.981<\/td>\n1.886<\/td>\n1.721<\/td>\n1.654<\/td>\n0.05<\/td>\n<\/tr>\n
    M2.5<\/td>\n1.3<\/td>\n3.8<\/td>\n2.48<\/td>\n2.38<\/td>\n2.188<\/td>\n2.117<\/td>\n0.056<\/td>\n<\/tr>\n
    M3<\/td>\n1.5<\/td>\n4.5<\/td>\n2.98<\/td>\n2.874<\/td>\n2.655<\/td>\n2.58<\/td>\n0.063<\/td>\n<\/tr>\n
    M3.5<\/td>\n1.7<\/td>\n5<\/td>\n3.479<\/td>\n3.354<\/td>\n3.089<\/td>\n3.004<\/td>\n0.075<\/td>\n<\/tr>\n
    M4<\/td>\n2<\/td>\n6<\/td>\n3.978<\/td>\n3.838<\/td>\n3.523<\/td>\n3.433<\/td>\n0.088<\/td>\n<\/tr>\n
    M5<\/td>\n2.5<\/td>\n7.5<\/td>\n4.976<\/td>\n4.826<\/td>\n4.456<\/td>\n4.361<\/td>\n0.1<\/td>\n<\/tr>\n
    M6<\/td>\n3<\/td>\n9<\/td>\n5.974<\/td>\n5.794<\/td>\n5.324<\/td>\n5.212<\/td>\n0.125<\/td>\n<\/tr>\n
    M7<\/td>\n3<\/td>\n9<\/td>\n6.974<\/td>\n6.794<\/td>\n6.324<\/td>\n6.212<\/td>\n0.125<\/td>\n<\/tr>\n
    M8<\/td>\n4<\/td>\n12<\/td>\n7.972<\/td>\n7.76<\/td>\n7.16<\/td>\n7.042<\/td>\n0.156<\/td>\n<\/tr>\n
    M10<\/td>\n5<\/td>\n15<\/td>\n9.968<\/td>\n9.732<\/td>\n8.994<\/td>\n8.862<\/td>\n0.188<\/td>\n<\/tr>\n
    M12<\/td>\n6<\/td>\n18<\/td>\n11.966<\/td>\n11.701<\/td>\n10.829<\/td>\n10.679<\/td>\n0.219<\/td>\n<\/tr>\n
    M14<\/td>\n8<\/td>\n24<\/td>\n13.962<\/td>\n13.682<\/td>\n12.663<\/td>\n12.503<\/td>\n0.25<\/td>\n<\/tr>\n
    M16<\/td>\n8<\/td>\n24<\/td>\n15.962<\/td>\n15.682<\/td>\n14.663<\/td>\n14.503<\/td>\n0.25<\/td>\n<\/tr>\n
    M18<\/td>\n10<\/td>\n30<\/td>\n17.958<\/td>\n17.623<\/td>\n16.334<\/td>\n16.164<\/td>\n0.313<\/td>\n<\/tr>\n
    M20<\/td>\n10<\/td>\n30<\/td>\n19.958<\/td>\n19.623<\/td>\n18.334<\/td>\n18.164<\/td>\n0.313<\/td>\n<\/tr>\n
    M22<\/td>\n10<\/td>\n30<\/td>\n21.958<\/td>\n21.623<\/td>\n20.334<\/td>\n20.164<\/td>\n0.313<\/td>\n<\/tr>\n
    M24<\/td>\n12<\/td>\n36<\/td>\n23.952<\/td>\n23.577<\/td>\n22.003<\/td>\n21.803<\/td>\n0.375<\/td>\n<\/tr>\n
    M27<\/td>\n12<\/td>\n36<\/td>\n26.952<\/td>\n26.577<\/td>\n25.003<\/td>\n24.803<\/td>\n0.375<\/td>\n<\/tr>\n
    M30<\/td>\n15<\/td>\n45<\/td>\n29.947<\/td>\n29.522<\/td>\n27.674<\/td>\n27.462<\/td>\n0.438<\/td>\n<\/tr>\n
    M33<\/td>\n15<\/td>\n45<\/td>\n32.947<\/td>\n32.522<\/td>\n30.674<\/td>\n30.462<\/td>\n0.438<\/td>\n<\/tr>\n
    M36<\/td>\n18<\/td>\n53<\/td>\n35.94<\/td>\n35.465<\/td>\n33.342<\/td>\n33.118<\/td>\n0.5<\/td>\n<\/tr>\n
    M39<\/td>\n18<\/td>\n53<\/td>\n38.94<\/td>\n38.465<\/td>\n36.342<\/td>\n36.118<\/td>\n0.5<\/td>\n<\/tr>\n
    M42<\/td>\n21<\/td>\n63<\/td>\n41.937<\/td>\n41.437<\/td>\n39.014<\/td>\n38.778<\/td>\n0.563<\/td>\n<\/tr>\n
    M45<\/td>\n21<\/td>\n63<\/td>\n44.937<\/td>\n44.437<\/td>\n42.014<\/td>\n41.778<\/td>\n0.563<\/td>\n<\/tr>\n
    M48<\/td>\n24<\/td>\n71<\/td>\n47.929<\/td>\n47.399<\/td>\n44.681<\/td>\n44.431<\/td>\n0.625<\/td>\n<\/tr>\n
    M52<\/td>\n24<\/td>\n71<\/td>\n51.929<\/td>\n51.399<\/td>\n48.681<\/td>\n48.431<\/td>\n0.625<\/td>\n<\/tr>\n
    M56<\/td>\n28<\/td>\n85<\/td>\n55.925<\/td>\n55.365<\/td>\n52.353<\/td>\n52.088<\/td>\n0.688<\/td>\n<\/tr>\n
    M60<\/td>\n28<\/td>\n85<\/td>\n59.925<\/td>\n59.365<\/td>\n56.353<\/td>\n56.088<\/td>\n0.688<\/td>\n<\/tr>\n
    M64<\/td>\n32<\/td>\n95<\/td>\n63.92<\/td>\n63.32<\/td>\n60.023<\/td>\n59.743<\/td>\n0.75<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    UN<\/sup> Per i dettagli relativi al raggio di raccordo alla base del giunto, consultare il capitolo 7 e la tabella 9 della norma GB\/T 197-2003. Questi elementi garantiscono la distribuzione delle sollecitazioni e la resistenza alla fatica.<\/p>\n<\/div>\n

    \n

    Filettature interne a passo fine<\/h2>\n

    Precisione media, innesto medio, zona di tolleranza 6H. I passi fini offrono una migliore resistenza alle vibrazioni e una maggiore precisione di regolazione.<\/p>\n

    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Filo<\/th>\nDurata dell'impegno<\/th>\nDiametro del passo D2<\/sub><\/th>\nDiametro minore D1<\/sub><\/th>\n<\/tr>\n
    ><\/th>\n\u2264<\/th>\nmassimo<\/th>\nminimo<\/th>\nmassimo<\/th>\nminimo<\/th>\n<\/tr>\n<\/thead>\n
    M8\u00d71<\/td>\n3<\/td>\n9<\/td>\n7.5<\/td>\n7.35<\/td>\n7.153<\/td>\n6.917<\/td>\n<\/tr>\n
    M10\u00d71<\/td>\n4<\/td>\n12<\/td>\n9.5<\/td>\n9.35<\/td>\n9.153<\/td>\n8.917<\/td>\n<\/tr>\n
    M10\u00d71.25<\/td>\n4<\/td>\n12<\/td>\n9.348<\/td>\n9.188<\/td>\n8.912<\/td>\n8.647<\/td>\n<\/tr>\n
    M12\u00d71.25<\/td>\n4.5<\/td>\n13<\/td>\n11.368<\/td>\n11.188<\/td>\n10.912<\/td>\n10.647<\/td>\n<\/tr>\n
    M12\u00d71.5<\/td>\n4.5<\/td>\n13<\/td>\n11.216<\/td>\n11.026<\/td>\n10.676<\/td>\n10.376<\/td>\n<\/tr>\n
    M14\u00d71.5<\/td>\n5.6<\/td>\n16<\/td>\n13.216<\/td>\n13.026<\/td>\n12.676<\/td>\n12.376<\/td>\n<\/tr>\n
    M16\u00d71.5<\/td>\n5.6<\/td>\n16<\/td>\n15.216<\/td>\n15.026<\/td>\n14.676<\/td>\n14.376<\/td>\n<\/tr>\n
    M18\u00d71.5<\/td>\n5.6<\/td>\n16<\/td>\n17.216<\/td>\n17.026<\/td>\n16.676<\/td>\n16.376<\/td>\n<\/tr>\n
    M18\u00d72<\/td>\n5.6<\/td>\n16<\/td>\n16.913<\/td>\n16.701<\/td>\n16.21<\/td>\n15.835<\/td>\n<\/tr>\n
    M20\u00d71.5<\/td>\n5.6<\/td>\n16<\/td>\n19.216<\/td>\n19.026<\/td>\n18.676<\/td>\n18.376<\/td>\n<\/tr>\n
    M20\u00d72<\/td>\n5.6<\/td>\n16<\/td>\n18.913<\/td>\n18.701<\/td>\n18.21<\/td>\n17.835<\/td>\n<\/tr>\n
    M22\u00d71.5<\/td>\n5.6<\/td>\n16<\/td>\n21.216<\/td>\n21.026<\/td>\n20.676<\/td>\n20.376<\/td>\n<\/tr>\n
    M22\u00d72<\/td>\n5.6<\/td>\n16<\/td>\n20.913<\/td>\n20.701<\/td>\n20.21<\/td>\n19.835<\/td>\n<\/tr>\n
    M24\u00d72<\/td>\n8.5<\/td>\n25<\/td>\n22.925<\/td>\n22.701<\/td>\n22.21<\/td>\n21.835<\/td>\n<\/tr>\n
    M27\u00d72<\/td>\n8.5<\/td>\n25<\/td>\n25.925<\/td>\n25.701<\/td>\n25.21<\/td>\n24.835<\/td>\n<\/tr>\n
    M30\u00d72<\/td>\n8.5<\/td>\n25<\/td>\n28.925<\/td>\n28.701<\/td>\n28.21<\/td>\n27.835<\/td>\n<\/tr>\n
    M33\u00d72<\/td>\n8.5<\/td>\n25<\/td>\n31.925<\/td>\n31.701<\/td>\n31.21<\/td>\n30.835<\/td>\n<\/tr>\n
    M36\u00d73<\/td>\n12<\/td>\n36<\/td>\n34.316<\/td>\n34.051<\/td>\n33.252<\/td>\n32.752<\/td>\n<\/tr>\n
    M39\u00d73<\/td>\n12<\/td>\n36<\/td>\n37.316<\/td>\n37.051<\/td>\n36.252<\/td>\n35.752<\/td>\n<\/tr>\n
    M42\u00d73<\/td>\n12<\/td>\n36<\/td>\n40.316<\/td>\n40.051<\/td>\n39.252<\/td>\n38.752<\/td>\n<\/tr>\n
    M45\u00d73<\/td>\n12<\/td>\n36<\/td>\n43.316<\/td>\n43.051<\/td>\n42.252<\/td>\n41.752<\/td>\n<\/tr>\n
    M48\u00d73<\/td>\n15<\/td>\n45<\/td>\n46.331<\/td>\n46.051<\/td>\n45.252<\/td>\n44.752<\/td>\n<\/tr>\n
    M52\u00d74<\/td>\n19<\/td>\n56<\/td>\n49.717<\/td>\n49.402<\/td>\n48.27<\/td>\n47.67<\/td>\n<\/tr>\n
    M56\u00d74<\/td>\n19<\/td>\n56<\/td>\n53.717<\/td>\n53.402<\/td>\n52.27<\/td>\n51.67<\/td>\n<\/tr>\n
    M60\u00d74<\/td>\n19<\/td>\n56<\/td>\n57.717<\/td>\n57.402<\/td>\n56.27<\/td>\n55.67<\/td>\n<\/tr>\n
    M64\u00d74<\/td>\n19<\/td>\n56<\/td>\n61.717<\/td>\n61.402<\/td>\n60.27<\/td>\n59.67<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    Questi valori favoriscono una distribuzione pi\u00f9 precisa del carico in ambienti soggetti a forti vibrazioni.<\/p>\n<\/div>\n

    \n

    Filettature esterne a passo fine<\/h2>\n

    Precisione media, innesto medio, zona di tolleranza di 6 g. Offre sezioni centrali pi\u00f9 robuste per una maggiore resistenza al taglio.<\/p>\n

    \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Filo<\/th>\nDurata dell'impegno<\/th>\nDiametro maggiore d<\/th>\nDiametro del passo d2<\/sub><\/th>\nRaggio minimo della radiceUN<\/sup><\/th>\n<\/tr>\n
    ><\/th>\n\u2264<\/th>\nmassimo<\/th>\nminimo<\/th>\nmassimo<\/th>\nminimo<\/th>\nminimo<\/th>\n<\/tr>\n<\/thead>\n
    M8\u00d71<\/td>\n3<\/td>\n9<\/td>\n7.974<\/td>\n7.794<\/td>\n7.324<\/td>\n7.212<\/td>\n0.125<\/td>\n<\/tr>\n
    M10\u00d71<\/td>\n4<\/td>\n12<\/td>\n9.974<\/td>\n9.794<\/td>\n9.324<\/td>\n9.212<\/td>\n0.125<\/td>\n<\/tr>\n
    M10\u00d71.25<\/td>\n4<\/td>\n12<\/td>\n9.972<\/td>\n9.76<\/td>\n9.16<\/td>\n9.042<\/td>\n0.156<\/td>\n<\/tr>\n
    M12\u00d71.25<\/td>\n4.5<\/td>\n13<\/td>\n11.972<\/td>\n11.76<\/td>\n11.16<\/td>\n11.028<\/td>\n0.156<\/td>\n<\/tr>\n
    M12\u00d71.5<\/td>\n4.5<\/td>\n13<\/td>\n11.968<\/td>\n11.732<\/td>\n10.994<\/td>\n10.854<\/td>\n0.188<\/td>\n<\/tr>\n
    M14\u00d71.5<\/td>\n5.6<\/td>\n16<\/td>\n13.968<\/td>\n13.732<\/td>\n12.994<\/td>\n12.854<\/td>\n0.188<\/td>\n<\/tr>\n
    M16\u00d71.5<\/td>\n5.6<\/td>\n16<\/td>\n15.968<\/td>\n15.732<\/td>\n14.994<\/td>\n14.854<\/td>\n0.188<\/td>\n<\/tr>\n
    M18\u00d71.5<\/td>\n5.6<\/td>\n16<\/td>\n17.968<\/td>\n17.732<\/td>\n16.994<\/td>\n16.854<\/td>\n0.188<\/td>\n<\/tr>\n
    M18\u00d72<\/td>\n5.6<\/td>\n16<\/td>\n17.962<\/td>\n17.682<\/td>\n16.663<\/td>\n16.503<\/td>\n0.25<\/td>\n<\/tr>\n
    M20\u00d71.5<\/td>\n5.6<\/td>\n16<\/td>\n19.968<\/td>\n19.732<\/td>\n18.994<\/td>\n18.854<\/td>\n0.188<\/td>\n<\/tr>\n
    M20\u00d72<\/td>\n5.6<\/td>\n16<\/td>\n19.962<\/td>\n19.682<\/td>\n18.663<\/td>\n18.503<\/td>\n0.25<\/td>\n<\/tr>\n
    M22\u00d71.5<\/td>\n5.6<\/td>\n16<\/td>\n21.968<\/td>\n21.732<\/td>\n20.994<\/td>\n20.854<\/td>\n0.188<\/td>\n<\/tr>\n
    M22\u00d72<\/td>\n5.6<\/td>\n16<\/td>\n21.962<\/td>\n21.682<\/td>\n20.663<\/td>\n20.503<\/td>\n0.25<\/td>\n<\/tr>\n
    M24\u00d72<\/td>\n8.5<\/td>\n25<\/td>\n23.962<\/td>\n23.682<\/td>\n22.663<\/td>\n22.493<\/td>\n0.25<\/td>\n<\/tr>\n
    M27\u00d72<\/td>\n8.5<\/td>\n25<\/td>\n26.962<\/td>\n26.682<\/td>\n25.663<\/td>\n25.493<\/td>\n0.25<\/td>\n<\/tr>\n
    M30\u00d72<\/td>\n8.5<\/td>\n25<\/td>\n29.962<\/td>\n29.682<\/td>\n28.663<\/td>\n28.493<\/td>\n0.25<\/td>\n<\/tr>\n
    M33\u00d72<\/td>\n8.5<\/td>\n25<\/td>\n32.962<\/td>\n32.682<\/td>\n31.663<\/td>\n31.493<\/td>\n0.25<\/td>\n<\/tr>\n
    M36\u00d73<\/td>\n12<\/td>\n36<\/td>\n35.952<\/td>\n35.577<\/td>\n34.003<\/td>\n33.803<\/td>\n0.375<\/td>\n<\/tr>\n
    M39\u00d73<\/td>\n12<\/td>\n36<\/td>\n38.952<\/td>\n38.577<\/td>\n37.003<\/td>\n36.803<\/td>\n0.375<\/td>\n<\/tr>\n
    M42\u00d73<\/td>\n12<\/td>\n36<\/td>\n41.952<\/td>\n41.577<\/td>\n40.003<\/td>\n39.803<\/td>\n0.375<\/td>\n<\/tr>\n
    M45\u00d73<\/td>\n12<\/td>\n36<\/td>\n44.952<\/td>\n44.577<\/td>\n43.003<\/td>\n42.803<\/td>\n0.375<\/td>\n<\/tr>\n
    M48\u00d73<\/td>\n15<\/td>\n45<\/td>\n47.952<\/td>\n47.577<\/td>\n46.003<\/td>\n45.791<\/td>\n0.375<\/td>\n<\/tr>\n
    M52\u00d74<\/td>\n19<\/td>\n56<\/td>\n51.94<\/td>\n51.465<\/td>\n49.342<\/td>\n49.106<\/td>\n0.5<\/td>\n<\/tr>\n
    M56\u00d74<\/td>\n19<\/td>\n56<\/td>\n55.94<\/td>\n55.465<\/td>\n53.342<\/td>\n53.106<\/td>\n0.5<\/td>\n<\/tr>\n
    M60\u00d74<\/td>\n19<\/td>\n56<\/td>\n59.94<\/td>\n59.465<\/td>\n57.342<\/td>\n57.106<\/td>\n0.5<\/td>\n<\/tr>\n
    M64\u00d74<\/td>\n19<\/td>\n56<\/td>\n63.94<\/td>\n63.465<\/td>\n61.342<\/td>\n61.106<\/td>\n0.5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    UN<\/sup> Consultare la norma GB\/T 197-2003 per le specifiche relative al raggio di curvatura della radice, fondamentale per evitare concentrazioni di stress.<\/p>\n<\/div>\n

    \n

    Domande frequenti<\/h2>\n

    Quali zone di tolleranza si applicano alle filettature interne a passo grosso?<\/h3>\n

    5H per diametri \u22641,4 mm; 6H per >1,4 mm, garantendo un accoppiamento di media precisione.<\/p>\n

    In che modo la placcatura influisce sulle dimensioni della filettatura?<\/h3>\n

    Le tolleranze sono relative alla pre-placcatura; i profili post-placcatura non devono superare le posizioni H\/h per i rivestimenti sottili al fine di mantenere l'assemblaggio.<\/p>\n

    Perch\u00e9 utilizzare filettature a passo fine?<\/h3>\n

    Offrono una migliore resistenza alle vibrazioni e regolazioni pi\u00f9 precise, con nuclei pi\u00f9 robusti secondo i limiti indicati nelle tabelle 3 e 4.<\/p>\n

    Che cos'\u00e8 un impegno di durata media?<\/h3>\n

    Trova il giusto equilibrio tra resistenza della filettatura e costo; utilizzare i valori della tabella per intervalli specifici per evitare un eccessivo o insufficiente innesto.<\/p>\n

    Come interpretare il raggio di radice?<\/h3>\n

    I valori minimi previsti dalla norma GB\/T 197-2003 riducono le sollecitazioni; essenziali per le applicazioni soggette a fatica.<\/p>\n

    Questi limiti si applicano a tutti i materiali?<\/h3>\n

    S\u00ec, ma \u00e8 necessario apportare delle modifiche per le placcature speciali; consultare le norme per i rivestimenti pesanti che richiedono filettature sovradimensionate.<\/p>\n<\/div>\n

     [\/et_pb_text][\/et_pb_column]
    \n\t\t\t[\/et_pb_row]
    \n\t\t[\/et_pb_section]<\/p>","protected":false},"excerpt":{"rendered":"

    Introduction to GB\/T 9145-2003 Standard This standard specifies limit dimensions for general-purpose metric screw threads of medium accuracy in the preferred series, ensuring interchangeability and performance in mechanical assemblies. It covers coarse and fine pitch threads for internal and external applications, with tolerances applied before plating for thin coatings. Scope GB\/T 9145-2003 defines the limit […]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"

    \r\n

    Introduction to GB\/T 9145-2003 Standard<\/h2>\r\nThis standard specifies limit dimensions for general-purpose metric screw threads of medium accuracy in the preferred series, ensuring interchangeability and performance in mechanical assemblies. It covers coarse and fine pitch threads for internal and external applications, with tolerances applied before plating for thin coatings.\r\n\r\n<\/div>\r\n
    \r\n

    Scope<\/h2>\r\nGB\/T 9145-2003 defines the limit dimensions for metric screw threads with medium tolerance precision and preferred series, applicable to general engineering purposes. It ensures that thread profiles do not exceed the maximum material condition defined by basic profiles and tolerance positions. This is crucial for fasteners in industries requiring reliable mating without interference, especially post-plating.\r\n
      \r\n \t
    • Applies to threads before thin coatings like electroplating.<\/li>\r\n \t
    • Post-plating, profiles must stay within H or h positions.<\/li>\r\n \t
    • Focuses on medium engagement lengths for balanced strength and manufacturability.<\/li>\r\n<\/ul>\r\n<\/div>\r\n
      \r\n

      General Limit Dimensions<\/h2>\r\nNo point on the thread root profile shall exceed the maximum entity profile per basic form and tolerance. For plated threads, actual contours post-plating must not surpass H\/h positions. This prevents over-tightening or failure in assemblies. Note: Tolerances suit thin platings; heavier coatings require adjustments.\r\n\r\n<\/div>\r\n
      \r\n

      Coarse Pitch Internal Threads<\/h2>\r\nFor medium precision, engagement length is medium. Tolerance zones: 5H for d \u2264 1.4 mm; 6H for d > 1.4 mm. Limits for pitch diameter D2<\/sub> and minor diameter D1<\/sub> ensure proper fit with external threads.\r\n
      \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
      Thread<\/th>\r\nEngagement Length<\/th>\r\nPitch Diameter D2<\/sub><\/th>\r\nMinor Diameter D1<\/sub><\/th>\r\n<\/tr>\r\n
      ><\/th>\r\n\u2264<\/th>\r\nmax<\/th>\r\nmin<\/th>\r\nmax<\/th>\r\nmin<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
      M1<\/td>\r\n0.6<\/td>\r\n1.7<\/td>\r\n0.894<\/td>\r\n0.838<\/td>\r\n0.785<\/td>\r\n0.729<\/td>\r\n<\/tr>\r\n
      M1.2<\/td>\r\n0.6<\/td>\r\n1.7<\/td>\r\n1.094<\/td>\r\n1.038<\/td>\r\n0.985<\/td>\r\n0.929<\/td>\r\n<\/tr>\r\n
      M1.4<\/td>\r\n0.7<\/td>\r\n2<\/td>\r\n1.265<\/td>\r\n1.205<\/td>\r\n1.142<\/td>\r\n1.075<\/td>\r\n<\/tr>\r\n
      M1.6<\/td>\r\n0.8<\/td>\r\n2.6<\/td>\r\n1.458<\/td>\r\n1.373<\/td>\r\n1.321<\/td>\r\n1.221<\/td>\r\n<\/tr>\r\n
      M1.8<\/td>\r\n0.8<\/td>\r\n2.6<\/td>\r\n1.658<\/td>\r\n1.573<\/td>\r\n1.521<\/td>\r\n1.421<\/td>\r\n<\/tr>\r\n
      M2<\/td>\r\n1<\/td>\r\n3<\/td>\r\n1.83<\/td>\r\n1.74<\/td>\r\n1.679<\/td>\r\n1.567<\/td>\r\n<\/tr>\r\n
      M2.5<\/td>\r\n1.3<\/td>\r\n3.8<\/td>\r\n2.303<\/td>\r\n2.208<\/td>\r\n2.138<\/td>\r\n2.013<\/td>\r\n<\/tr>\r\n
      M3<\/td>\r\n1.5<\/td>\r\n4.5<\/td>\r\n2.775<\/td>\r\n2.675<\/td>\r\n2.599<\/td>\r\n2.459<\/td>\r\n<\/tr>\r\n
      M3.5<\/td>\r\n1.7<\/td>\r\n5<\/td>\r\n3.222<\/td>\r\n3.11<\/td>\r\n3.01<\/td>\r\n2.85<\/td>\r\n<\/tr>\r\n
      M4<\/td>\r\n2<\/td>\r\n6<\/td>\r\n3.663<\/td>\r\n3.545<\/td>\r\n3.422<\/td>\r\n3.242<\/td>\r\n<\/tr>\r\n
      M5<\/td>\r\n2.5<\/td>\r\n7.5<\/td>\r\n4.605<\/td>\r\n4.48<\/td>\r\n4.334<\/td>\r\n4.134<\/td>\r\n<\/tr>\r\n
      M6<\/td>\r\n3<\/td>\r\n9<\/td>\r\n5.5<\/td>\r\n5.35<\/td>\r\n5.153<\/td>\r\n4.917<\/td>\r\n<\/tr>\r\n
      M7<\/td>\r\n3<\/td>\r\n9<\/td>\r\n6.5<\/td>\r\n6.35<\/td>\r\n6.153<\/td>\r\n5.917<\/td>\r\n<\/tr>\r\n
      M8<\/td>\r\n4<\/td>\r\n12<\/td>\r\n7.348<\/td>\r\n7.188<\/td>\r\n6.912<\/td>\r\n6.647<\/td>\r\n<\/tr>\r\n
      M10<\/td>\r\n5<\/td>\r\n15<\/td>\r\n9.206<\/td>\r\n9.026<\/td>\r\n8.676<\/td>\r\n8.376<\/td>\r\n<\/tr>\r\n
      M12<\/td>\r\n6<\/td>\r\n18<\/td>\r\n11.063<\/td>\r\n10.863<\/td>\r\n10.441<\/td>\r\n10.106<\/td>\r\n<\/tr>\r\n
      M14<\/td>\r\n8<\/td>\r\n24<\/td>\r\n12.913<\/td>\r\n12.701<\/td>\r\n12.21<\/td>\r\n11.835<\/td>\r\n<\/tr>\r\n
      M16<\/td>\r\n8<\/td>\r\n24<\/td>\r\n14.913<\/td>\r\n14.701<\/td>\r\n14.21<\/td>\r\n13.835<\/td>\r\n<\/tr>\r\n
      M18<\/td>\r\n10<\/td>\r\n30<\/td>\r\n16.6<\/td>\r\n16.376<\/td>\r\n15.744<\/td>\r\n15.294<\/td>\r\n<\/tr>\r\n
      M20<\/td>\r\n10<\/td>\r\n30<\/td>\r\n18.6<\/td>\r\n18.376<\/td>\r\n17.744<\/td>\r\n17.294<\/td>\r\n<\/tr>\r\n
      M22<\/td>\r\n10<\/td>\r\n30<\/td>\r\n20.6<\/td>\r\n20.376<\/td>\r\n19.744<\/td>\r\n19.294<\/td>\r\n<\/tr>\r\n
      M24<\/td>\r\n12<\/td>\r\n36<\/td>\r\n22.316<\/td>\r\n22.051<\/td>\r\n21.252<\/td>\r\n20.752<\/td>\r\n<\/tr>\r\n
      M27<\/td>\r\n12<\/td>\r\n36<\/td>\r\n25.316<\/td>\r\n25.051<\/td>\r\n24.252<\/td>\r\n23.752<\/td>\r\n<\/tr>\r\n
      M30<\/td>\r\n15<\/td>\r\n45<\/td>\r\n28.007<\/td>\r\n27.727<\/td>\r\n26.771<\/td>\r\n26.211<\/td>\r\n<\/tr>\r\n
      M33<\/td>\r\n15<\/td>\r\n45<\/td>\r\n31.007<\/td>\r\n30.727<\/td>\r\n29.771<\/td>\r\n29.211<\/td>\r\n<\/tr>\r\n
      M36<\/td>\r\n18<\/td>\r\n53<\/td>\r\n33.702<\/td>\r\n33.402<\/td>\r\n32.27<\/td>\r\n31.67<\/td>\r\n<\/tr>\r\n
      M39<\/td>\r\n18<\/td>\r\n53<\/td>\r\n36.702<\/td>\r\n36.402<\/td>\r\n35.27<\/td>\r\n34.67<\/td>\r\n<\/tr>\r\n
      M42<\/td>\r\n21<\/td>\r\n63<\/td>\r\n39.392<\/td>\r\n39.077<\/td>\r\n37.799<\/td>\r\n37.129<\/td>\r\n<\/tr>\r\n
      M45<\/td>\r\n21<\/td>\r\n63<\/td>\r\n42.392<\/td>\r\n42.077<\/td>\r\n40.799<\/td>\r\n40.129<\/td>\r\n<\/tr>\r\n
      M48<\/td>\r\n24<\/td>\r\n71<\/td>\r\n45.087<\/td>\r\n44.752<\/td>\r\n43.297<\/td>\r\n42.587<\/td>\r\n<\/tr>\r\n
      M52<\/td>\r\n24<\/td>\r\n71<\/td>\r\n49.087<\/td>\r\n48.752<\/td>\r\n46.681<\/td>\r\n45.971<\/td>\r\n<\/tr>\r\n
      M56<\/td>\r\n28<\/td>\r\n85<\/td>\r\n52.783<\/td>\r\n52.428<\/td>\r\n50.796<\/td>\r\n50.046<\/td>\r\n<\/tr>\r\n
      M60<\/td>\r\n28<\/td>\r\n85<\/td>\r\n56.783<\/td>\r\n56.428<\/td>\r\n54.796<\/td>\r\n54.046<\/td>\r\n<\/tr>\r\n
      M64<\/td>\r\n32<\/td>\r\n95<\/td>\r\n60.478<\/td>\r\n60.103<\/td>\r\n58.305<\/td>\r\n57.505<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\nThese dimensions provide guidance for nut manufacturing, ensuring compatibility with bolts under medium load conditions.\r\n\r\n<\/div>\r\n
      \r\n

      Coarse Pitch External Threads<\/h2>\r\nMedium precision, medium engagement. Tolerance zones: 6h for d \u2264 1.4 mm; 6g for d > 1.4 mm. Limits for major diameter d and pitch diameter d2<\/sub>, with min root radius per GB\/T 197-2003.\r\n
      \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
      Thread<\/th>\r\nEngagement Length<\/th>\r\nMajor Diameter d<\/th>\r\nPitch Diameter d2<\/sub><\/th>\r\nMin Root Radiusa<\/sup><\/th>\r\n<\/tr>\r\n
      ><\/th>\r\n\u2264<\/th>\r\nmax<\/th>\r\nmin<\/th>\r\nmax<\/th>\r\nmin<\/th>\r\nmin<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
      M1<\/td>\r\n0.6<\/td>\r\n1.7<\/td>\r\n1<\/td>\r\n0.933<\/td>\r\n0.838<\/td>\r\n0.785<\/td>\r\n0.031<\/td>\r\n<\/tr>\r\n
      M1.2<\/td>\r\n0.6<\/td>\r\n1.7<\/td>\r\n1.2<\/td>\r\n1.133<\/td>\r\n1.038<\/td>\r\n0.985<\/td>\r\n0.031<\/td>\r\n<\/tr>\r\n
      M1.4<\/td>\r\n0.7<\/td>\r\n2<\/td>\r\n1.4<\/td>\r\n1.325<\/td>\r\n1.205<\/td>\r\n1.149<\/td>\r\n0.038<\/td>\r\n<\/tr>\r\n
      M1.6<\/td>\r\n0.8<\/td>\r\n2.6<\/td>\r\n1.581<\/td>\r\n1.496<\/td>\r\n1.354<\/td>\r\n1.291<\/td>\r\n0.044<\/td>\r\n<\/tr>\r\n
      M1.8<\/td>\r\n0.8<\/td>\r\n2.6<\/td>\r\n1.781<\/td>\r\n1.696<\/td>\r\n1.554<\/td>\r\n1.491<\/td>\r\n0.044<\/td>\r\n<\/tr>\r\n
      M2<\/td>\r\n1<\/td>\r\n3<\/td>\r\n1.981<\/td>\r\n1.886<\/td>\r\n1.721<\/td>\r\n1.654<\/td>\r\n0.05<\/td>\r\n<\/tr>\r\n
      M2.5<\/td>\r\n1.3<\/td>\r\n3.8<\/td>\r\n2.48<\/td>\r\n2.38<\/td>\r\n2.188<\/td>\r\n2.117<\/td>\r\n0.056<\/td>\r\n<\/tr>\r\n
      M3<\/td>\r\n1.5<\/td>\r\n4.5<\/td>\r\n2.98<\/td>\r\n2.874<\/td>\r\n2.655<\/td>\r\n2.58<\/td>\r\n0.063<\/td>\r\n<\/tr>\r\n
      M3.5<\/td>\r\n1.7<\/td>\r\n5<\/td>\r\n3.479<\/td>\r\n3.354<\/td>\r\n3.089<\/td>\r\n3.004<\/td>\r\n0.075<\/td>\r\n<\/tr>\r\n
      M4<\/td>\r\n2<\/td>\r\n6<\/td>\r\n3.978<\/td>\r\n3.838<\/td>\r\n3.523<\/td>\r\n3.433<\/td>\r\n0.088<\/td>\r\n<\/tr>\r\n
      M5<\/td>\r\n2.5<\/td>\r\n7.5<\/td>\r\n4.976<\/td>\r\n4.826<\/td>\r\n4.456<\/td>\r\n4.361<\/td>\r\n0.1<\/td>\r\n<\/tr>\r\n
      M6<\/td>\r\n3<\/td>\r\n9<\/td>\r\n5.974<\/td>\r\n5.794<\/td>\r\n5.324<\/td>\r\n5.212<\/td>\r\n0.125<\/td>\r\n<\/tr>\r\n
      M7<\/td>\r\n3<\/td>\r\n9<\/td>\r\n6.974<\/td>\r\n6.794<\/td>\r\n6.324<\/td>\r\n6.212<\/td>\r\n0.125<\/td>\r\n<\/tr>\r\n
      M8<\/td>\r\n4<\/td>\r\n12<\/td>\r\n7.972<\/td>\r\n7.76<\/td>\r\n7.16<\/td>\r\n7.042<\/td>\r\n0.156<\/td>\r\n<\/tr>\r\n
      M10<\/td>\r\n5<\/td>\r\n15<\/td>\r\n9.968<\/td>\r\n9.732<\/td>\r\n8.994<\/td>\r\n8.862<\/td>\r\n0.188<\/td>\r\n<\/tr>\r\n
      M12<\/td>\r\n6<\/td>\r\n18<\/td>\r\n11.966<\/td>\r\n11.701<\/td>\r\n10.829<\/td>\r\n10.679<\/td>\r\n0.219<\/td>\r\n<\/tr>\r\n
      M14<\/td>\r\n8<\/td>\r\n24<\/td>\r\n13.962<\/td>\r\n13.682<\/td>\r\n12.663<\/td>\r\n12.503<\/td>\r\n0.25<\/td>\r\n<\/tr>\r\n
      M16<\/td>\r\n8<\/td>\r\n24<\/td>\r\n15.962<\/td>\r\n15.682<\/td>\r\n14.663<\/td>\r\n14.503<\/td>\r\n0.25<\/td>\r\n<\/tr>\r\n
      M18<\/td>\r\n10<\/td>\r\n30<\/td>\r\n17.958<\/td>\r\n17.623<\/td>\r\n16.334<\/td>\r\n16.164<\/td>\r\n0.313<\/td>\r\n<\/tr>\r\n
      M20<\/td>\r\n10<\/td>\r\n30<\/td>\r\n19.958<\/td>\r\n19.623<\/td>\r\n18.334<\/td>\r\n18.164<\/td>\r\n0.313<\/td>\r\n<\/tr>\r\n
      M22<\/td>\r\n10<\/td>\r\n30<\/td>\r\n21.958<\/td>\r\n21.623<\/td>\r\n20.334<\/td>\r\n20.164<\/td>\r\n0.313<\/td>\r\n<\/tr>\r\n
      M24<\/td>\r\n12<\/td>\r\n36<\/td>\r\n23.952<\/td>\r\n23.577<\/td>\r\n22.003<\/td>\r\n21.803<\/td>\r\n0.375<\/td>\r\n<\/tr>\r\n
      M27<\/td>\r\n12<\/td>\r\n36<\/td>\r\n26.952<\/td>\r\n26.577<\/td>\r\n25.003<\/td>\r\n24.803<\/td>\r\n0.375<\/td>\r\n<\/tr>\r\n
      M30<\/td>\r\n15<\/td>\r\n45<\/td>\r\n29.947<\/td>\r\n29.522<\/td>\r\n27.674<\/td>\r\n27.462<\/td>\r\n0.438<\/td>\r\n<\/tr>\r\n
      M33<\/td>\r\n15<\/td>\r\n45<\/td>\r\n32.947<\/td>\r\n32.522<\/td>\r\n30.674<\/td>\r\n30.462<\/td>\r\n0.438<\/td>\r\n<\/tr>\r\n
      M36<\/td>\r\n18<\/td>\r\n53<\/td>\r\n35.94<\/td>\r\n35.465<\/td>\r\n33.342<\/td>\r\n33.118<\/td>\r\n0.5<\/td>\r\n<\/tr>\r\n
      M39<\/td>\r\n18<\/td>\r\n53<\/td>\r\n38.94<\/td>\r\n38.465<\/td>\r\n36.342<\/td>\r\n36.118<\/td>\r\n0.5<\/td>\r\n<\/tr>\r\n
      M42<\/td>\r\n21<\/td>\r\n63<\/td>\r\n41.937<\/td>\r\n41.437<\/td>\r\n39.014<\/td>\r\n38.778<\/td>\r\n0.563<\/td>\r\n<\/tr>\r\n
      M45<\/td>\r\n21<\/td>\r\n63<\/td>\r\n44.937<\/td>\r\n44.437<\/td>\r\n42.014<\/td>\r\n41.778<\/td>\r\n0.563<\/td>\r\n<\/tr>\r\n
      M48<\/td>\r\n24<\/td>\r\n71<\/td>\r\n47.929<\/td>\r\n47.399<\/td>\r\n44.681<\/td>\r\n44.431<\/td>\r\n0.625<\/td>\r\n<\/tr>\r\n
      M52<\/td>\r\n24<\/td>\r\n71<\/td>\r\n51.929<\/td>\r\n51.399<\/td>\r\n48.681<\/td>\r\n48.431<\/td>\r\n0.625<\/td>\r\n<\/tr>\r\n
      M56<\/td>\r\n28<\/td>\r\n85<\/td>\r\n55.925<\/td>\r\n55.365<\/td>\r\n52.353<\/td>\r\n52.088<\/td>\r\n0.688<\/td>\r\n<\/tr>\r\n
      M60<\/td>\r\n28<\/td>\r\n85<\/td>\r\n59.925<\/td>\r\n59.365<\/td>\r\n56.353<\/td>\r\n56.088<\/td>\r\n0.688<\/td>\r\n<\/tr>\r\n
      M64<\/td>\r\n32<\/td>\r\n95<\/td>\r\n63.92<\/td>\r\n63.32<\/td>\r\n60.023<\/td>\r\n59.743<\/td>\r\n0.75<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\na<\/sup> See GB\/T 197-2003 Chapter 7 and Table 9 for root radius details. These ensure stress distribution and fatigue resistance.\r\n\r\n<\/div>\r\n
      \r\n

      Fine Pitch Internal Threads<\/h2>\r\nMedium precision, medium engagement, 6H tolerance zone. Fine pitches offer better vibration resistance and adjustment precision.\r\n
      \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
      Thread<\/th>\r\nEngagement Length<\/th>\r\nPitch Diameter D2<\/sub><\/th>\r\nMinor Diameter D1<\/sub><\/th>\r\n<\/tr>\r\n
      ><\/th>\r\n\u2264<\/th>\r\nmax<\/th>\r\nmin<\/th>\r\nmax<\/th>\r\nmin<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
      M8\u00d71<\/td>\r\n3<\/td>\r\n9<\/td>\r\n7.5<\/td>\r\n7.35<\/td>\r\n7.153<\/td>\r\n6.917<\/td>\r\n<\/tr>\r\n
      M10\u00d71<\/td>\r\n4<\/td>\r\n12<\/td>\r\n9.5<\/td>\r\n9.35<\/td>\r\n9.153<\/td>\r\n8.917<\/td>\r\n<\/tr>\r\n
      M10\u00d71.25<\/td>\r\n4<\/td>\r\n12<\/td>\r\n9.348<\/td>\r\n9.188<\/td>\r\n8.912<\/td>\r\n8.647<\/td>\r\n<\/tr>\r\n
      M12\u00d71.25<\/td>\r\n4.5<\/td>\r\n13<\/td>\r\n11.368<\/td>\r\n11.188<\/td>\r\n10.912<\/td>\r\n10.647<\/td>\r\n<\/tr>\r\n
      M12\u00d71.5<\/td>\r\n4.5<\/td>\r\n13<\/td>\r\n11.216<\/td>\r\n11.026<\/td>\r\n10.676<\/td>\r\n10.376<\/td>\r\n<\/tr>\r\n
      M14\u00d71.5<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n13.216<\/td>\r\n13.026<\/td>\r\n12.676<\/td>\r\n12.376<\/td>\r\n<\/tr>\r\n
      M16\u00d71.5<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n15.216<\/td>\r\n15.026<\/td>\r\n14.676<\/td>\r\n14.376<\/td>\r\n<\/tr>\r\n
      M18\u00d71.5<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n17.216<\/td>\r\n17.026<\/td>\r\n16.676<\/td>\r\n16.376<\/td>\r\n<\/tr>\r\n
      M18\u00d72<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n16.913<\/td>\r\n16.701<\/td>\r\n16.21<\/td>\r\n15.835<\/td>\r\n<\/tr>\r\n
      M20\u00d71.5<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n19.216<\/td>\r\n19.026<\/td>\r\n18.676<\/td>\r\n18.376<\/td>\r\n<\/tr>\r\n
      M20\u00d72<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n18.913<\/td>\r\n18.701<\/td>\r\n18.21<\/td>\r\n17.835<\/td>\r\n<\/tr>\r\n
      M22\u00d71.5<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n21.216<\/td>\r\n21.026<\/td>\r\n20.676<\/td>\r\n20.376<\/td>\r\n<\/tr>\r\n
      M22\u00d72<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n20.913<\/td>\r\n20.701<\/td>\r\n20.21<\/td>\r\n19.835<\/td>\r\n<\/tr>\r\n
      M24\u00d72<\/td>\r\n8.5<\/td>\r\n25<\/td>\r\n22.925<\/td>\r\n22.701<\/td>\r\n22.21<\/td>\r\n21.835<\/td>\r\n<\/tr>\r\n
      M27\u00d72<\/td>\r\n8.5<\/td>\r\n25<\/td>\r\n25.925<\/td>\r\n25.701<\/td>\r\n25.21<\/td>\r\n24.835<\/td>\r\n<\/tr>\r\n
      M30\u00d72<\/td>\r\n8.5<\/td>\r\n25<\/td>\r\n28.925<\/td>\r\n28.701<\/td>\r\n28.21<\/td>\r\n27.835<\/td>\r\n<\/tr>\r\n
      M33\u00d72<\/td>\r\n8.5<\/td>\r\n25<\/td>\r\n31.925<\/td>\r\n31.701<\/td>\r\n31.21<\/td>\r\n30.835<\/td>\r\n<\/tr>\r\n
      M36\u00d73<\/td>\r\n12<\/td>\r\n36<\/td>\r\n34.316<\/td>\r\n34.051<\/td>\r\n33.252<\/td>\r\n32.752<\/td>\r\n<\/tr>\r\n
      M39\u00d73<\/td>\r\n12<\/td>\r\n36<\/td>\r\n37.316<\/td>\r\n37.051<\/td>\r\n36.252<\/td>\r\n35.752<\/td>\r\n<\/tr>\r\n
      M42\u00d73<\/td>\r\n12<\/td>\r\n36<\/td>\r\n40.316<\/td>\r\n40.051<\/td>\r\n39.252<\/td>\r\n38.752<\/td>\r\n<\/tr>\r\n
      M45\u00d73<\/td>\r\n12<\/td>\r\n36<\/td>\r\n43.316<\/td>\r\n43.051<\/td>\r\n42.252<\/td>\r\n41.752<\/td>\r\n<\/tr>\r\n
      M48\u00d73<\/td>\r\n15<\/td>\r\n45<\/td>\r\n46.331<\/td>\r\n46.051<\/td>\r\n45.252<\/td>\r\n44.752<\/td>\r\n<\/tr>\r\n
      M52\u00d74<\/td>\r\n19<\/td>\r\n56<\/td>\r\n49.717<\/td>\r\n49.402<\/td>\r\n48.27<\/td>\r\n47.67<\/td>\r\n<\/tr>\r\n
      M56\u00d74<\/td>\r\n19<\/td>\r\n56<\/td>\r\n53.717<\/td>\r\n53.402<\/td>\r\n52.27<\/td>\r\n51.67<\/td>\r\n<\/tr>\r\n
      M60\u00d74<\/td>\r\n19<\/td>\r\n56<\/td>\r\n57.717<\/td>\r\n57.402<\/td>\r\n56.27<\/td>\r\n55.67<\/td>\r\n<\/tr>\r\n
      M64\u00d74<\/td>\r\n19<\/td>\r\n56<\/td>\r\n61.717<\/td>\r\n61.402<\/td>\r\n60.27<\/td>\r\n59.67<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\nThese values support finer load distribution in high-vibration environments.\r\n\r\n<\/div>\r\n
      \r\n

      Fine Pitch External Threads<\/h2>\r\nMedium precision, medium engagement, 6g tolerance zone. Provides stronger core sections for enhanced shear strength.\r\n
      \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
      Thread<\/th>\r\nEngagement Length<\/th>\r\nMajor Diameter d<\/th>\r\nPitch Diameter d2<\/sub><\/th>\r\nMin Root Radiusa<\/sup><\/th>\r\n<\/tr>\r\n
      ><\/th>\r\n\u2264<\/th>\r\nmax<\/th>\r\nmin<\/th>\r\nmax<\/th>\r\nmin<\/th>\r\nmin<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
      M8\u00d71<\/td>\r\n3<\/td>\r\n9<\/td>\r\n7.974<\/td>\r\n7.794<\/td>\r\n7.324<\/td>\r\n7.212<\/td>\r\n0.125<\/td>\r\n<\/tr>\r\n
      M10\u00d71<\/td>\r\n4<\/td>\r\n12<\/td>\r\n9.974<\/td>\r\n9.794<\/td>\r\n9.324<\/td>\r\n9.212<\/td>\r\n0.125<\/td>\r\n<\/tr>\r\n
      M10\u00d71.25<\/td>\r\n4<\/td>\r\n12<\/td>\r\n9.972<\/td>\r\n9.76<\/td>\r\n9.16<\/td>\r\n9.042<\/td>\r\n0.156<\/td>\r\n<\/tr>\r\n
      M12\u00d71.25<\/td>\r\n4.5<\/td>\r\n13<\/td>\r\n11.972<\/td>\r\n11.76<\/td>\r\n11.16<\/td>\r\n11.028<\/td>\r\n0.156<\/td>\r\n<\/tr>\r\n
      M12\u00d71.5<\/td>\r\n4.5<\/td>\r\n13<\/td>\r\n11.968<\/td>\r\n11.732<\/td>\r\n10.994<\/td>\r\n10.854<\/td>\r\n0.188<\/td>\r\n<\/tr>\r\n
      M14\u00d71.5<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n13.968<\/td>\r\n13.732<\/td>\r\n12.994<\/td>\r\n12.854<\/td>\r\n0.188<\/td>\r\n<\/tr>\r\n
      M16\u00d71.5<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n15.968<\/td>\r\n15.732<\/td>\r\n14.994<\/td>\r\n14.854<\/td>\r\n0.188<\/td>\r\n<\/tr>\r\n
      M18\u00d71.5<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n17.968<\/td>\r\n17.732<\/td>\r\n16.994<\/td>\r\n16.854<\/td>\r\n0.188<\/td>\r\n<\/tr>\r\n
      M18\u00d72<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n17.962<\/td>\r\n17.682<\/td>\r\n16.663<\/td>\r\n16.503<\/td>\r\n0.25<\/td>\r\n<\/tr>\r\n
      M20\u00d71.5<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n19.968<\/td>\r\n19.732<\/td>\r\n18.994<\/td>\r\n18.854<\/td>\r\n0.188<\/td>\r\n<\/tr>\r\n
      M20\u00d72<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n19.962<\/td>\r\n19.682<\/td>\r\n18.663<\/td>\r\n18.503<\/td>\r\n0.25<\/td>\r\n<\/tr>\r\n
      M22\u00d71.5<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n21.968<\/td>\r\n21.732<\/td>\r\n20.994<\/td>\r\n20.854<\/td>\r\n0.188<\/td>\r\n<\/tr>\r\n
      M22\u00d72<\/td>\r\n5.6<\/td>\r\n16<\/td>\r\n21.962<\/td>\r\n21.682<\/td>\r\n20.663<\/td>\r\n20.503<\/td>\r\n0.25<\/td>\r\n<\/tr>\r\n
      M24\u00d72<\/td>\r\n8.5<\/td>\r\n25<\/td>\r\n23.962<\/td>\r\n23.682<\/td>\r\n22.663<\/td>\r\n22.493<\/td>\r\n0.25<\/td>\r\n<\/tr>\r\n
      M27\u00d72<\/td>\r\n8.5<\/td>\r\n25<\/td>\r\n26.962<\/td>\r\n26.682<\/td>\r\n25.663<\/td>\r\n25.493<\/td>\r\n0.25<\/td>\r\n<\/tr>\r\n
      M30\u00d72<\/td>\r\n8.5<\/td>\r\n25<\/td>\r\n29.962<\/td>\r\n29.682<\/td>\r\n28.663<\/td>\r\n28.493<\/td>\r\n0.25<\/td>\r\n<\/tr>\r\n
      M33\u00d72<\/td>\r\n8.5<\/td>\r\n25<\/td>\r\n32.962<\/td>\r\n32.682<\/td>\r\n31.663<\/td>\r\n31.493<\/td>\r\n0.25<\/td>\r\n<\/tr>\r\n
      M36\u00d73<\/td>\r\n12<\/td>\r\n36<\/td>\r\n35.952<\/td>\r\n35.577<\/td>\r\n34.003<\/td>\r\n33.803<\/td>\r\n0.375<\/td>\r\n<\/tr>\r\n
      M39\u00d73<\/td>\r\n12<\/td>\r\n36<\/td>\r\n38.952<\/td>\r\n38.577<\/td>\r\n37.003<\/td>\r\n36.803<\/td>\r\n0.375<\/td>\r\n<\/tr>\r\n
      M42\u00d73<\/td>\r\n12<\/td>\r\n36<\/td>\r\n41.952<\/td>\r\n41.577<\/td>\r\n40.003<\/td>\r\n39.803<\/td>\r\n0.375<\/td>\r\n<\/tr>\r\n
      M45\u00d73<\/td>\r\n12<\/td>\r\n36<\/td>\r\n44.952<\/td>\r\n44.577<\/td>\r\n43.003<\/td>\r\n42.803<\/td>\r\n0.375<\/td>\r\n<\/tr>\r\n
      M48\u00d73<\/td>\r\n15<\/td>\r\n45<\/td>\r\n47.952<\/td>\r\n47.577<\/td>\r\n46.003<\/td>\r\n45.791<\/td>\r\n0.375<\/td>\r\n<\/tr>\r\n
      M52\u00d74<\/td>\r\n19<\/td>\r\n56<\/td>\r\n51.94<\/td>\r\n51.465<\/td>\r\n49.342<\/td>\r\n49.106<\/td>\r\n0.5<\/td>\r\n<\/tr>\r\n
      M56\u00d74<\/td>\r\n19<\/td>\r\n56<\/td>\r\n55.94<\/td>\r\n55.465<\/td>\r\n53.342<\/td>\r\n53.106<\/td>\r\n0.5<\/td>\r\n<\/tr>\r\n
      M60\u00d74<\/td>\r\n19<\/td>\r\n56<\/td>\r\n59.94<\/td>\r\n59.465<\/td>\r\n57.342<\/td>\r\n57.106<\/td>\r\n0.5<\/td>\r\n<\/tr>\r\n
      M64\u00d74<\/td>\r\n19<\/td>\r\n56<\/td>\r\n63.94<\/td>\r\n63.465<\/td>\r\n61.342<\/td>\r\n61.106<\/td>\r\n0.5<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\na<\/sup> See GB\/T 197-2003 for root radius specifications, critical for avoiding stress concentrations.\r\n\r\n<\/div>\r\n
      \r\n

      FAQ<\/h2>\r\n

      What tolerance zones apply to coarse internal threads?<\/h3>\r\n5H for diameters \u22641.4 mm; 6H for >1.4 mm, ensuring medium precision fit.\r\n

      How does plating affect thread dimensions?<\/h3>\r\nTolerances are pre-plating; post-plating profiles must not exceed H\/h positions for thin coatings to maintain assembly.\r\n

      Why use fine pitch threads?<\/h3>\r\nThey provide better vibration resistance and finer adjustments, with stronger cores per limits in tables 3 and 4.\r\n

      What is medium engagement length?<\/h3>\r\nIt balances thread strength and cost; use table values for specific ranges to avoid over- or under-engagement.\r\n

      How to interpret root radius?<\/h3>\r\nMin values per GB\/T 197-2003 reduce stress; essential for fatigue-prone applications.\r\n

      Are these limits for all materials?<\/h3>\r\nYes, but adjust for special platings; consult standard for heavy coatings requiring oversized threads.\r\n\r\n<\/div>\r\n ","_et_gb_content_width":"","footnotes":""},"categories":[220],"tags":[],"class_list":["post-5757","post","type-post","status-publish","format-standard","hentry","category-technical-documentation-and-references"],"_links":{"self":[{"href":"https:\/\/korea-transmission.com\/it\/wp-json\/wp\/v2\/posts\/5757","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/korea-transmission.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/it\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/it\/wp-json\/wp\/v2\/comments?post=5757"}],"version-history":[{"count":3,"href":"https:\/\/korea-transmission.com\/it\/wp-json\/wp\/v2\/posts\/5757\/revisions"}],"predecessor-version":[{"id":5760,"href":"https:\/\/korea-transmission.com\/it\/wp-json\/wp\/v2\/posts\/5757\/revisions\/5760"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/it\/wp-json\/wp\/v2\/media?parent=5757"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/korea-transmission.com\/it\/wp-json\/wp\/v2\/categories?post=5757"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/it\/wp-json\/wp\/v2\/tags?post=5757"}],"curies":[{"name":"parola chiave","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}