{"id":5582,"date":"2025-12-22T08:33:37","date_gmt":"2025-12-22T08:33:37","guid":{"rendered":"https:\/\/korea-transmission.com\/?p=5582"},"modified":"2025-12-22T08:34:32","modified_gmt":"2025-12-22T08:34:32","slug":"gb-t-3103-3-2020-flat-washer-tolerances-guide","status":"publish","type":"post","link":"https:\/\/korea-transmission.com\/it\/blog\/gb-t-3103-3-2020-flat-washer-tolerances-guide\/","title":{"rendered":"GB\/T 3103.3-2020 Guida alle tolleranze delle rondelle piane"},"content":{"rendered":"

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GB\/T 3103.3-2020 Guida alle tolleranze delle rondelle piane<\/h1>\n
Tolleranze per rondelle piatte<\/div>\n

<\/p>\n

\n

1. Introduzione<\/h2>\n

Le rondelle piane svolgono un ruolo fondamentale nei sistemi di fissaggio, distribuendo i carichi, prevenendo danni superficiali e garantendo l'integrit\u00e0 dell'assemblaggio. La norma GB\/T 3103.3-2020 specifica le tolleranze per le rondelle piane con diametri nominali da 1 mm a 150 mm, applicabili ai gradi di prodotto A, C e F. Questa norma \u00e8 essenziale per mantenere la precisione nei settori dell'ingegneria meccanica, automobilistico, aerospaziale e delle costruzioni.<\/p>\n

Adottata dalla norma ISO 4759-3:2016, garantisce la compatibilit\u00e0 con le pratiche internazionali, promuovendo il controllo qualit\u00e0 e l'intercambiabilit\u00e0. Questa guida specifica le tolleranze per foro interno, diametro esterno, spessore, smussi e attributi di forma\/posizione, supportando gli ingegneri nelle fasi di progettazione e approvvigionamento.<\/p>\n<\/div>\n

<\/p>\n

\n

2. Panoramica dello standard GB\/T 3103.3-2020<\/h2>\n

Pubblicata nel 2020 dall'Amministrazione cinese per la standardizzazione, questa norma aggiorna le versioni precedenti per allinearle ai progressi globali nella tecnologia dei dispositivi di fissaggio. Si applica alle rondelle piane utilizzate con bulloni, viti e dadi, escludendo i tipi speciali come le rondelle elastiche.<\/p>\n

Il contenuto principale comprende le tolleranze dimensionali prima del trattamento superficiale, con disposizioni per le deviazioni solo se tecnicamente giustificate. Le tolleranze di forma e posizione sono conformi alle norme GB\/T 1182 e GB\/T 16671.<\/p>\n<\/div>\n

<\/p>\n

\n

3. Principi di base delle tolleranze delle rondelle piane<\/h2>\n

Le tolleranze garantiscono che le rondelle si adattino perfettamente agli assemblaggi, prevenendo guasti dovuti a disallineamenti o giochi eccessivi. Sono definite per le classi di prodotto: A (precisione), C (generale) e F (fine). Salvo diversa indicazione, le tolleranze si applicano al pretrattamento.<\/p>\n

I parametri chiave includono il diametro interno (d1<\/sub>), diametro esterno (d2<\/sub>), spessore (t), smussi (c1<\/sub>, C2<\/sub>), e tolleranze di forma come coassialit\u00e0 e planarit\u00e0.<\/p>\n<\/div>\n

<\/p>\n

\n

4. Specifiche dettagliate delle tolleranze<\/h2>\n
4.1 Foro interno d1<\/sub><\/div>\n

 <\/p>\n

Tolleranze per il foro interno d1<\/sub> variano in base allo spessore e alla qualit\u00e0 del prodotto.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Spessore<\/th>\nTolleranze<\/th>\n<\/tr>\n
Grado del prodotto<\/th>\n<\/tr>\n
F<\/th>\nUN<\/th>\nC<\/th>\n<\/tr>\n<\/thead>\n
t < 2
\n2 \u2264 t < 4
\nt \u2265 4<\/td>\n		d1<\/sub>
\nTolleranza<\/td>\n		T1<\/sub>
\nminimo<\/td>\n		e1<\/sub>
\nmassimo<\/td>\n		d1<\/sub>
\nTolleranza<\/td>\n		T1<\/sub>
\nminimo<\/td>\n		e1<\/sub>
\nmassimo<\/td>\n		d1<\/sub>
\nTolleranza<\/td>\n<\/tr>\n
H12<\/td>\n0,5 t<\/td>\n0,10 t<\/td>\nH13<\/td>\n0,3 t<\/td>\n0,15 t<\/td>\nH14<\/td>\n<\/tr>\n
H12<\/td>\n0,3 t<\/td>\n0,15 t<\/td>\nH13<\/td>\n0,25 t<\/td>\n0,20 t<\/td>\nH14<\/td>\n<\/tr>\n
H13<\/td>\n0,2 t<\/td>\n0,20 t<\/td>\nH14<\/td>\n0,2 t<\/td>\n0,25 t<\/td>\nH15<\/td>\n<\/tr>\n
La foratura non \u00e8 definita ma \u00e8 consentita<\/td>\nFascia di strappo (e1<\/sub>), T1<\/sub> e la bruciatura non \u00e8 definita ma \u00e8 consentita<\/td>\n<\/tr>\n
T1<\/sub> \u00e8 la porzione del foro entro la tolleranza specificata di d1<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.2 Diametro esterno d2<\/sub><\/div>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Spessore<\/th>\nTolleranze<\/th>\n<\/tr>\n
Grado del prodotto<\/th>\n<\/tr>\n
F<\/th>\nUN<\/th>\nC<\/th>\n<\/tr>\n<\/thead>\n
t < 2
\n2 \u2264 t < 4
\nt \u2265 4<\/td>\n		d2<\/sub>
\nTolleranza<\/td>\n		e2<\/sub>
\nmassimo<\/td>\n		d2<\/sub>
\nTolleranza<\/td>\n		e2<\/sub>
\nmassimo<\/td>\n		d2<\/sub>
\nTolleranza<\/td>\n<\/tr>\n
h13<\/td>\n0,13 t<\/td>\nh14<\/td>\n0,18 t<\/td>\nh16<\/td>\n<\/tr>\n
h13<\/td>\n0,15 t<\/td>\nh14<\/td>\n0,20 t<\/td>\nh16<\/td>\n<\/tr>\n
h14<\/td>\n0,18 t<\/td>\nh15<\/td>\n0,25 t<\/td>\nh16<\/td>\n<\/tr>\n
Burring e t2<\/sub> non definito ma consentito<\/td>\nFascia di strappo (e2<\/sub>), T2<\/sub> e la bruciatura non \u00e8 definita ma \u00e8 consentita<\/td>\n<\/tr>\n
T2<\/sub> \u00e8 la porzione del diametro esterno entro la tolleranza specificata di d2<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.3 Spessore t<\/div>\n

Tolleranze di spessore misurate dopo la sbavatura.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Spessore t<\/th>\nGrado del prodotto<\/th>\n<\/tr>\n
F<\/th>\nUN<\/th>\nC<\/th>\n<\/tr>\n<\/thead>\n
t \u2264 0,5<\/td>\n\u00b10,04<\/td>\n\u00b10,05<\/td>\n\u00b10,10<\/td>\n<\/tr>\n
0,5 < t \u2264 1<\/td>\n\u00b10,06<\/td>\n\u00b10,10<\/td>\n\u00b10,20<\/td>\n<\/tr>\n
1 < t \u2264 2,5<\/td>\n\u00b10,12<\/td>\n\u00b10,20<\/td>\n\u00b10,30<\/td>\n<\/tr>\n
2,5 < t \u2264 4<\/td>\n\u00b10,16<\/td>\n\u00b10,30<\/td>\n\u00b10,60<\/td>\n<\/tr>\n
4 < t \u2264 6<\/td>\n\u00b10,20<\/td>\n\u00b10,60<\/td>\n\u00b11,00<\/td>\n<\/tr>\n
6 < t \u2264 10<\/td>\n\u00b10,24<\/td>\n\u00b11,00<\/td>\n\u00b11,20<\/td>\n<\/tr>\n
10 < t \u2264 20<\/td>\n\u00b10,28<\/td>\n\u00b11,20<\/td>\n\u00b11,60<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.4 Smussi<\/div>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n
Spessore nominale<\/th>\nGrado del prodotto<\/th>\n<\/tr>\n
F<\/th>\nUN<\/th>\nC<\/th>\n<\/tr>\n
c1<\/sub>
\nminimo<\/th>\n		c2<\/sub>
\nminimo<\/th>\n		c1<\/sub>
\nminimo<\/th>\n		c2<\/sub>
\nminimo<\/th>\n		c1<\/sub>
\nminimo<\/th>\n		c2<\/sub>
\nminimo<\/th>\n<\/tr>\n<\/thead>\n
1 \u2264 t < 2<\/td>\n0,20 t<\/td>\n0,25 t<\/td>\n0,20 t<\/td>\n0,25 t<\/td>\n0,20 t<\/td>\n0,25 t<\/td>\n<\/tr>\n
2 \u2264 t < 4<\/td>\n0,18 t<\/td>\n0,22 t<\/td>\n0,18 t<\/td>\n0,22 t<\/td>\n0,18 t<\/td>\n0,22 t<\/td>\n<\/tr>\n
t \u2265 4<\/td>\n0,15 t<\/td>\n0,20 t<\/td>\n0,15 t<\/td>\n0,20 t<\/td>\n0,15 t<\/td>\n0,20 t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.4.3 Requisiti supplementari per le lavatrici combinate<\/div>\n

Su richiesta dell'acquirente, la posizione della smussatura rispetto alle deviazioni di stampaggio deve essere specificata nell'ordine.<\/p>\n

4.5 Tolleranze di forma e posizione<\/div>\n

\u0394t si applica all'esterno di x = 0,1 (d2<\/sub> - D1<\/sub>), ovvero 60% di larghezza dell'anello.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Spessore t<\/th>\nGrado del prodotto<\/th>\n<\/tr>\n
F<\/th>\nUN<\/th>\nC<\/th>\n<\/tr>\n
\u0394t
\nmassimo<\/th>\n		\u0394t
\nmassimo<\/th>\n		<\/th>\n<\/tr>\n<\/thead>\n
t \u2264 0,5<\/td>\n0.02<\/td>\n0.025<\/td>\nNessun requisito<\/td>\n<\/tr>\n
0,5 < t \u2264 1<\/td>\n0.03<\/td>\n0.05<\/td>\n<\/tr>\n
1 < t \u2264 2,5<\/td>\n0.06<\/td>\n0.1<\/td>\n<\/tr>\n
2,5 < t \u2264 4<\/td>\n0.08<\/td>\n0.15<\/td>\n<\/tr>\n
4 < t \u2264 6<\/td>\n0.1<\/td>\n0.2<\/td>\n<\/tr>\n
6 < t \u2264 10<\/td>\n0.12<\/td>\n0.3<\/td>\n<\/tr>\n
10 < t \u2264 20<\/td>\n0.14<\/td>\n0.4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.5.2 Coassialit\u00e0 y<\/div>\n\n\n\n\n\n\n\n\n\n\n
Spessore t<\/th>\nGrado del prodotto<\/th>\n<\/tr>\n
F<\/th>\nUN<\/th>\nC<\/th>\n<\/tr>\n
y
\nmassimo<\/th>\n		y
\nmassimo<\/th>\n		y
\nmassimo<\/th>\n<\/tr>\n<\/thead>\n
t < 2<\/td>\n2 IT11<\/td>\n2 IT12<\/td>\n2 IT13<\/td>\n<\/tr>\n
2 \u2264 t \u2264 4<\/td>\n2 IT12<\/td>\n2 IT13<\/td>\n2 IT14<\/td>\n<\/tr>\n
t \u2265 4<\/td>\n2 IT13<\/td>\n2 IT14<\/td>\n2 IT15<\/td>\n<\/tr>\n
Tolleranza y in base al diametro d2<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.5.3 Planarit\u00e0 (Deformazione) z<\/div>\n

La planarit\u00e0 z \u00e8 la differenza tra l'altezza effettiva heff<\/sub> e spessore effettivo teff<\/sub>Nota: Indipendentemente dalla tolleranza di spessore; processi aggiuntivi come la rettifica possono ridurre la flessione. Misurato dopo la sbavatura.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Spessore t<\/th>\nGrado del prodotto<\/th>\n<\/tr>\n
F<\/th>\nUN<\/th>\nC<\/th>\n<\/tr>\n
z
\nmassimo<\/th>\n		z
\nmassimo<\/th>\n		z
\nmassimo<\/th>\n<\/tr>\n<\/thead>\n
t \u2264 0,5<\/td>\n0.07<\/td>\n0.1<\/td>\n0.13<\/td>\n<\/tr>\n
0,5 < t \u2264 1<\/td>\n0.1<\/td>\n0.15<\/td>\n0.2<\/td>\n<\/tr>\n
1 < t \u2264 2,5<\/td>\n0.2<\/td>\n0.2<\/td>\n0.25<\/td>\n<\/tr>\n
2,5 < t \u2264 4<\/td>\n0.3<\/td>\n0.3<\/td>\n0.3<\/td>\n<\/tr>\n
4 < t \u2264 6<\/td>\n0.4<\/td>\n0.4<\/td>\n0.4<\/td>\n<\/tr>\n
6 < t \u2264 10<\/td>\n0.6<\/td>\n0.6<\/td>\n0.6<\/td>\n<\/tr>\n
10 < t \u2264 20<\/td>\n1<\/td>\n1<\/td>\n1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

\n

5. Requisiti chiave nella norma GB\/T 3103.3-2020<\/h2>\n

Le tolleranze devono essere verificate prima del trattamento superficiale. In caso di discrepanze, prevalgono gli standard di prodotto. Le misurazioni di spessore e planarit\u00e0 vengono effettuate dopo la sbavatura per garantire la precisione.<\/p>\n<\/div>\n

<\/p>\n

\n

6. Analisi della precisione e dell'errore<\/h2>\n

Gli errori possono derivare da processi di produzione come la stampatura, che possono causare bave o problemi di coassialit\u00e0. Migliora la precisione attraverso utensili di precisione e post-elaborazione. Un errore comune \u00e8 quello di ignorare le specifiche di smusso; risolvilo attenendoti alle tabelle specifiche per ogni grado di materiale.<\/p>\n<\/div>\n

<\/p>\n

\n

7. Impatto della norma GB\/T 3103.3-2020 sull'industria<\/h2>\n

Questo standard migliora la ricerca sui materiali standardizzando le tolleranze, facilita il controllo qualit\u00e0 nella produzione e supporta le applicazioni in settori ad alta precisione come quello aerospaziale, dove le rondelle di grado A garantiscono l'affidabilit\u00e0.<\/p>\n<\/div>\n

<\/p>\n

\n

8. Domande frequenti (FAQ)<\/h2>\n
\n

Qual \u00e8 la differenza tra le categorie di prodotto A, C e F?<\/h3>\n

La classe A offre le tolleranze pi\u00f9 strette per applicazioni di precisione, la classe C per uso generale e la classe F per tolleranze ridotte in scenari specifici, come dettagliato nelle tabelle.<\/p>\n<\/div>\n

\n

Quando \u00e8 opportuno misurare le tolleranze?<\/h3>\n

Le tolleranze si applicano prima del trattamento superficiale, mentre lo spessore e la planarit\u00e0 vengono misurati dopo la sbavatura per evitare imprecisioni dovute a difetti di fabbricazione.<\/p>\n<\/div>\n

\n

Come si confronta questo standard con ISO 4759-3?<\/h3>\n

La norma GB\/T 3103.3-2020 \u00e8 equivalente alla ISO 4759-3:2016, garantendo la compatibilit\u00e0 globale per le tolleranze delle rondelle piane.<\/p>\n<\/div>\n

\n

E se gli standard di prodotto fossero diversi da questi?<\/h3>\n

Gli standard specifici del prodotto hanno la precedenza, ma le deviazioni richiedono una giustificazione tecnica.<\/p>\n<\/div>\n

\n

Gli smussi sono obbligatori?<\/h3>\n

Le smussature minime sono specificate per evitare spigoli vivi, con valori basati sullo spessore e sulla qualit\u00e0; per le rondelle combinate, potrebbe essere necessario specificare la posizione.<\/p>\n<\/div>\n

\n

Come scegliere il voto appropriato per una domanda di ammissione?<\/h3>\n

La scelta si basa sulla precisione di assemblaggio: A per componenti critici sottoposti a carichi elevati, C per bullonatura standard, tenendo conto di fattori quali vibrazioni e distribuzione del carico.<\/p>\n<\/div>\n<\/div>\n

<\/div>\n

<\/p>\n<\/div>\n

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GB\/T 3103.3-2020 Flat Washer Tolerances Guide Tolerances for Flat Washers 1. Introduction Flat washers play a critical role in fastening systems by distributing loads, preventing surface damage, and ensuring assembly integrity. The GB\/T 3103.3-2020 standard specifies tolerances for plain flat washers with nominal diameters from 1 mm to 150 mm, applicable to product grades A, […]<\/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\r\n\r\n

GB\/T 3103.3-2020 Flat Washer Tolerances Guide<\/h1>\r\n
Tolerances for Flat Washers<\/div>\r\n\r\n
\r\n

1. Introduction<\/h2>\r\nFlat washers play a critical role in fastening systems by distributing loads, preventing surface damage, and ensuring assembly integrity. The GB\/T 3103.3-2020 standard specifies tolerances for plain flat washers with nominal diameters from 1 mm to 150 mm, applicable to product grades A, C, and F. This standard is essential for maintaining precision in mechanical engineering, automotive, aerospace, and construction industries.\r\n\r\nAdopted from ISO 4759-3:2016, it ensures compatibility with international practices, promoting quality control and interchangeability. This guide details tolerances for inner hole, outer diameter, thickness, chamfers, and form\/position attributes, aiding engineers in design and procurement.\r\n\r\n<\/div>\r\n\r\n
\r\n

2. GB\/T 3103.3-2020 Standard Overview<\/h2>\r\nReleased in 2020 by the Standardization Administration of China, this standard updates previous versions to align with global advancements in fastener technology. It applies to plain washers used with bolts, screws, and nuts, excluding special types like lock washers.\r\n\r\nKey content includes dimensional tolerances before surface treatment, with provisions for deviations only when technically justified. Shape and position tolerances follow GB\/T 1182 and GB\/T 16671.\r\n\r\n<\/div>\r\n\r\n
\r\n

3. Basic Principles of Flat Washer Tolerances<\/h2>\r\nTolerances ensure washers fit precisely in assemblies, preventing failures due to misalignment or excessive play. They are defined for product grades: A (precision), C (general), and F (fine). Unless specified otherwise, tolerances apply pre-treatment.\r\n\r\nKey parameters include inner diameter (d1<\/sub>), outer diameter (d2<\/sub>), thickness (t), chamfers (c1<\/sub>, c2<\/sub>), and form tolerances like coaxiality and flatness.\r\n\r\n<\/div>\r\n\r\n
\r\n

4. Detailed Tolerance Specifications<\/h2>\r\n
4.1 Inner Hole d1<\/sub><\/div>\r\n \r\n

Tolerances for inner hole d1<\/sub> vary by thickness and product grade.<\/p>\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
Thickness<\/th>\r\nTolerances<\/th>\r\n<\/tr>\r\n
Product Grade<\/th>\r\n<\/tr>\r\n
F<\/th>\r\nA<\/th>\r\nC<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
t < 2\r\n2 \u2264 t < 4\r\nt \u2265 4<\/td>\r\nd1<\/sub>\r\nTolerance<\/td>\r\nt1<\/sub>\r\nmin<\/td>\r\ne1<\/sub>\r\nmax<\/td>\r\nd1<\/sub>\r\nTolerance<\/td>\r\nt1<\/sub>\r\nmin<\/td>\r\ne1<\/sub>\r\nmax<\/td>\r\nd1<\/sub>\r\nTolerance<\/td>\r\n<\/tr>\r\n
H12<\/td>\r\n0.5 t<\/td>\r\n0.10 t<\/td>\r\nH13<\/td>\r\n0.3 t<\/td>\r\n0.15 t<\/td>\r\nH14<\/td>\r\n<\/tr>\r\n
H12<\/td>\r\n0.3 t<\/td>\r\n0.15 t<\/td>\r\nH13<\/td>\r\n0.25 t<\/td>\r\n0.20 t<\/td>\r\nH14<\/td>\r\n<\/tr>\r\n
H13<\/td>\r\n0.2 t<\/td>\r\n0.20 t<\/td>\r\nH14<\/td>\r\n0.2 t<\/td>\r\n0.25 t<\/td>\r\nH15<\/td>\r\n<\/tr>\r\n
Burring not defined but permitted<\/td>\r\nTear band (e1<\/sub>), t1<\/sub> and burring not defined but permitted<\/td>\r\n<\/tr>\r\n
t1<\/sub> is the portion of the hole within the specified tolerance of d1<\/sub><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n
4.2 Outer Diameter d2<\/sub><\/div>\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
Thickness<\/th>\r\nTolerances<\/th>\r\n<\/tr>\r\n
Product Grade<\/th>\r\n<\/tr>\r\n
F<\/th>\r\nA<\/th>\r\nC<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
t < 2\r\n2 \u2264 t < 4\r\nt \u2265 4<\/td>\r\nd2<\/sub>\r\nTolerance<\/td>\r\ne2<\/sub>\r\nmax<\/td>\r\nd2<\/sub>\r\nTolerance<\/td>\r\ne2<\/sub>\r\nmax<\/td>\r\nd2<\/sub>\r\nTolerance<\/td>\r\n<\/tr>\r\n
h13<\/td>\r\n0.13 t<\/td>\r\nh14<\/td>\r\n0.18 t<\/td>\r\nh16<\/td>\r\n<\/tr>\r\n
h13<\/td>\r\n0.15 t<\/td>\r\nh14<\/td>\r\n0.20 t<\/td>\r\nh16<\/td>\r\n<\/tr>\r\n
h14<\/td>\r\n0.18 t<\/td>\r\nh15<\/td>\r\n0.25 t<\/td>\r\nh16<\/td>\r\n<\/tr>\r\n
Burring and t2<\/sub> not defined but permitted<\/td>\r\nTear band (e2<\/sub>), t2<\/sub> and burring not defined but permitted<\/td>\r\n<\/tr>\r\n
t2<\/sub> is the portion of the outer diameter within the specified tolerance of d2<\/sub><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n
4.3 Thickness t<\/div>\r\n

Thickness tolerances measured after deburring.<\/p>\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
Thickness t<\/th>\r\nProduct Grade<\/th>\r\n<\/tr>\r\n
F<\/th>\r\nA<\/th>\r\nC<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
t \u2264 0.5<\/td>\r\n\u00b10.04<\/td>\r\n\u00b10.05<\/td>\r\n\u00b10.10<\/td>\r\n<\/tr>\r\n
0.5 < t \u2264 1<\/td>\r\n\u00b10.06<\/td>\r\n\u00b10.10<\/td>\r\n\u00b10.20<\/td>\r\n<\/tr>\r\n
1 < t \u2264 2.5<\/td>\r\n\u00b10.12<\/td>\r\n\u00b10.20<\/td>\r\n\u00b10.30<\/td>\r\n<\/tr>\r\n
2.5 < t \u2264 4<\/td>\r\n\u00b10.16<\/td>\r\n\u00b10.30<\/td>\r\n\u00b10.60<\/td>\r\n<\/tr>\r\n
4 < t \u2264 6<\/td>\r\n\u00b10.20<\/td>\r\n\u00b10.60<\/td>\r\n\u00b11.00<\/td>\r\n<\/tr>\r\n
6 < t \u2264 10<\/td>\r\n\u00b10.24<\/td>\r\n\u00b11.00<\/td>\r\n\u00b11.20<\/td>\r\n<\/tr>\r\n
10 < t \u2264 20<\/td>\r\n\u00b10.28<\/td>\r\n\u00b11.20<\/td>\r\n\u00b11.60<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n
4.4 Chamfers<\/div>\r\n \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Nominal Thickness<\/th>\r\nProduct Grade<\/th>\r\n<\/tr>\r\n
F<\/th>\r\nA<\/th>\r\nC<\/th>\r\n<\/tr>\r\n
c1<\/sub>\r\nmin<\/th>\r\nc2<\/sub>\r\nmin<\/th>\r\nc1<\/sub>\r\nmin<\/th>\r\nc2<\/sub>\r\nmin<\/th>\r\nc1<\/sub>\r\nmin<\/th>\r\nc2<\/sub>\r\nmin<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
1 \u2264 t < 2<\/td>\r\n0.20 t<\/td>\r\n0.25 t<\/td>\r\n0.20 t<\/td>\r\n0.25 t<\/td>\r\n0.20 t<\/td>\r\n0.25 t<\/td>\r\n<\/tr>\r\n
2 \u2264 t < 4<\/td>\r\n0.18 t<\/td>\r\n0.22 t<\/td>\r\n0.18 t<\/td>\r\n0.22 t<\/td>\r\n0.18 t<\/td>\r\n0.22 t<\/td>\r\n<\/tr>\r\n
t \u2265 4<\/td>\r\n0.15 t<\/td>\r\n0.20 t<\/td>\r\n0.15 t<\/td>\r\n0.20 t<\/td>\r\n0.15 t<\/td>\r\n0.20 t<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n
4.4.3 Combined Washers Supplementary Requirements<\/div>\r\nUpon buyer request, chamfer position relative to stamping deviations should be specified in the order.\r\n
4.5 Form and Position Tolerances<\/div>\r\n

\u0394t applies outside x = 0.1 (d2<\/sub> - d1<\/sub>), i.e., 60% of ring width.<\/p>\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
Thickness t<\/th>\r\nProduct Grade<\/th>\r\n<\/tr>\r\n
F<\/th>\r\nA<\/th>\r\nC<\/th>\r\n<\/tr>\r\n
\u0394t\r\nmax<\/th>\r\n\u0394t\r\nmax<\/th>\r\n<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
t \u2264 0.5<\/td>\r\n0.02<\/td>\r\n0.025<\/td>\r\nNo requirement<\/td>\r\n<\/tr>\r\n
0.5 < t \u2264 1<\/td>\r\n0.03<\/td>\r\n0.05<\/td>\r\n<\/tr>\r\n
1 < t \u2264 2.5<\/td>\r\n0.06<\/td>\r\n0.1<\/td>\r\n<\/tr>\r\n
2.5 < t \u2264 4<\/td>\r\n0.08<\/td>\r\n0.15<\/td>\r\n<\/tr>\r\n
4 < t \u2264 6<\/td>\r\n0.1<\/td>\r\n0.2<\/td>\r\n<\/tr>\r\n
6 < t \u2264 10<\/td>\r\n0.12<\/td>\r\n0.3<\/td>\r\n<\/tr>\r\n
10 < t \u2264 20<\/td>\r\n0.14<\/td>\r\n0.4<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n
4.5.2 Coaxiality y<\/div>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Thickness t<\/th>\r\nProduct Grade<\/th>\r\n<\/tr>\r\n
F<\/th>\r\nA<\/th>\r\nC<\/th>\r\n<\/tr>\r\n
y\r\nmax<\/th>\r\ny\r\nmax<\/th>\r\ny\r\nmax<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
t < 2<\/td>\r\n2 IT11<\/td>\r\n2 IT12<\/td>\r\n2 IT13<\/td>\r\n<\/tr>\r\n
2 \u2264 t \u2264 4<\/td>\r\n2 IT12<\/td>\r\n2 IT13<\/td>\r\n2 IT14<\/td>\r\n<\/tr>\r\n
t \u2265 4<\/td>\r\n2 IT13<\/td>\r\n2 IT14<\/td>\r\n2 IT15<\/td>\r\n<\/tr>\r\n
Tolerance y based on diameter d2<\/sub><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n
4.5.3 Flatness (Deflection) z<\/div>\r\n

Flatness z is the difference between effective height heff<\/sub> and effective thickness teff<\/sub>. Note: Independent of thickness tolerance; additional processes like grinding may reduce deflection. Measured after deburring.<\/p>\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
Thickness t<\/th>\r\nProduct Grade<\/th>\r\n<\/tr>\r\n
F<\/th>\r\nA<\/th>\r\nC<\/th>\r\n<\/tr>\r\n
z\r\nmax<\/th>\r\nz\r\nmax<\/th>\r\nz\r\nmax<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
t \u2264 0.5<\/td>\r\n0.07<\/td>\r\n0.1<\/td>\r\n0.13<\/td>\r\n<\/tr>\r\n
0.5 < t \u2264 1<\/td>\r\n0.1<\/td>\r\n0.15<\/td>\r\n0.2<\/td>\r\n<\/tr>\r\n
1 < t \u2264 2.5<\/td>\r\n0.2<\/td>\r\n0.2<\/td>\r\n0.25<\/td>\r\n<\/tr>\r\n
2.5 < t \u2264 4<\/td>\r\n0.3<\/td>\r\n0.3<\/td>\r\n0.3<\/td>\r\n<\/tr>\r\n
4 < t \u2264 6<\/td>\r\n0.4<\/td>\r\n0.4<\/td>\r\n0.4<\/td>\r\n<\/tr>\r\n
6 < t \u2264 10<\/td>\r\n0.6<\/td>\r\n0.6<\/td>\r\n0.6<\/td>\r\n<\/tr>\r\n
10 < t \u2264 20<\/td>\r\n1<\/td>\r\n1<\/td>\r\n1<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/div>\r\n\r\n
\r\n

5. Key Requirements in GB\/T 3103.3-2020<\/h2>\r\nTolerances must be verified pre-surface treatment. Product standards take precedence if differing. Measurements for thickness and flatness occur post-deburring to ensure accuracy.\r\n\r\n<\/div>\r\n\r\n
\r\n

6. Precision and Error Analysis<\/h2>\r\nErrors may arise from manufacturing processes like stamping, leading to burring or coaxiality issues. Improve accuracy via precise tooling and post-processing. Common errors include ignoring chamfer specs; resolve by adhering to grade-specific tables.\r\n\r\n<\/div>\r\n\r\n
\r\n

7. Impact of GB\/T 3103.3-2020 on Industry<\/h2>\r\nThis standard enhances material research by standardizing tolerances, aids quality control in manufacturing, and supports applications in high-precision sectors like aerospace, where grade A washers ensure reliability.\r\n\r\n<\/div>\r\n\r\n
\r\n

8. Frequently Asked Questions (FAQ)<\/h2>\r\n
\r\n

What is the difference between product grades A, C, and F?<\/h3>\r\nGrade A offers the tightest tolerances for precision applications, C for general use, and F for fine tolerances in specific scenarios, as detailed in the tables.\r\n\r\n<\/div>\r\n
\r\n

When should tolerances be measured?<\/h3>\r\nTolerances apply before surface treatment, with thickness and flatness measured after deburring to avoid inaccuracies from manufacturing artifacts.\r\n\r\n<\/div>\r\n
\r\n

How does this standard compare to ISO 4759-3?<\/h3>\r\nGB\/T 3103.3-2020 is equivalent to ISO 4759-3:2016, ensuring global compatibility for tolerances on flat washers.\r\n\r\n<\/div>\r\n
\r\n

What if product standards differ from this?<\/h3>\r\nProduct-specific standards take precedence, but deviations require technical justification.\r\n\r\n<\/div>\r\n
\r\n

Are chamfers mandatory?<\/h3>\r\nMinimum chamfers are specified to prevent sharp edges, with values based on thickness and grade; for combined washers, position may need specification.\r\n\r\n<\/div>\r\n
\r\n

How to select the appropriate grade for an application?<\/h3>\r\nChoose based on assembly precision: A for high-load critical parts, C for standard bolting, considering factors like vibration and load distribution.\r\n\r\n<\/div>\r\n<\/div>\r\n
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