{"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\/fr\/blog\/gb-t-3103-3-2020-flat-washer-tolerances-guide\/","title":{"rendered":"Guide des tol\u00e9rances des rondelles plates GB\/T 3103.3-2020"},"content":{"rendered":"

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<\/p>\n

Guide des tol\u00e9rances des rondelles plates GB\/T 3103.3-2020<\/h1>\n
Tol\u00e9rances pour les rondelles plates<\/div>\n

<\/p>\n

\n

1. Introduction<\/h2>\n

Les rondelles plates jouent un r\u00f4le essentiel dans les syst\u00e8mes de fixation\u00a0: elles r\u00e9partissent les charges, pr\u00e9viennent les dommages de surface et garantissent l\u2019int\u00e9grit\u00e9 de l\u2019assemblage. La norme GB\/T 3103.3-2020 sp\u00e9cifie les tol\u00e9rances des rondelles plates de diam\u00e8tre nominal compris entre 1\u00a0mm et 150\u00a0mm, applicables aux classes de produits A, C et F. Cette norme est indispensable au maintien de la pr\u00e9cision dans les secteurs de la m\u00e9canique, de l\u2019automobile, de l\u2019a\u00e9rospatiale et de la construction.<\/p>\n

Adopt\u00e9 \u00e0 partir de la norme ISO 4759-3:2016, ce guide garantit la compatibilit\u00e9 avec les pratiques internationales, favorisant ainsi le contr\u00f4le qualit\u00e9 et l'interchangeabilit\u00e9. Il d\u00e9taille les tol\u00e9rances relatives aux al\u00e9sages int\u00e9rieurs, aux diam\u00e8tres ext\u00e9rieurs, aux \u00e9paisseurs, aux chanfreins et aux attributs de forme et de position, aidant ainsi les ing\u00e9nieurs dans la conception et l'approvisionnement.<\/p>\n<\/div>\n

<\/p>\n

\n

2. Aper\u00e7u de la norme GB\/T 3103.3-2020<\/h2>\n

Publi\u00e9e en 2020 par l'Administration chinoise de la normalisation, cette norme met \u00e0 jour les versions pr\u00e9c\u00e9dentes afin de les aligner sur les progr\u00e8s mondiaux en mati\u00e8re de technologie de fixation. Elle s'applique aux rondelles plates utilis\u00e9es avec les boulons, les vis et les \u00e9crous, \u00e0 l'exclusion des rondelles sp\u00e9ciales telles que les rondelles frein.<\/p>\n

Les \u00e9l\u00e9ments cl\u00e9s comprennent les tol\u00e9rances dimensionnelles avant traitement de surface, avec des d\u00e9rogations autoris\u00e9es uniquement lorsqu'elles sont techniquement justifi\u00e9es. Les tol\u00e9rances de forme et de position sont conformes aux normes GB\/T 1182 et GB\/T 16671.<\/p>\n<\/div>\n

<\/p>\n

\n

3. Principes de base des tol\u00e9rances des rondelles plates<\/h2>\n

Les tol\u00e9rances garantissent un ajustement pr\u00e9cis des rondelles dans les assemblages, \u00e9vitant ainsi les d\u00e9faillances dues \u00e0 un mauvais alignement ou \u00e0 un jeu excessif. Elles sont d\u00e9finies pour les classes de produit suivantes\u00a0: A (pr\u00e9cision), C (standard) et F (finition fine). Sauf indication contraire, les tol\u00e9rances s\u2019appliquent avant traitement.<\/p>\n

Les param\u00e8tres cl\u00e9s comprennent le diam\u00e8tre int\u00e9rieur (d).1<\/sub>), diam\u00e8tre ext\u00e9rieur (d2<\/sub>), \u00e9paisseur (t), chanfreins (c1<\/sub>, c2<\/sub>), et les tol\u00e9rances de forme telles que la coaxialit\u00e9 et la plan\u00e9it\u00e9.<\/p>\n<\/div>\n

<\/p>\n

\n

4. Sp\u00e9cifications d\u00e9taill\u00e9es des tol\u00e9rances<\/h2>\n
4.1 Trou int\u00e9rieur d1<\/sub><\/div>\n

 <\/p>\n

Tol\u00e9rances pour l'al\u00e9sage int\u00e9rieur d1<\/sub> varient selon l'\u00e9paisseur et la qualit\u00e9 du produit.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u00c9paisseur<\/th>\nTol\u00e9rances<\/th>\n<\/tr>\n
Qualit\u00e9 du produit<\/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>
\nTol\u00e9rance<\/td>\n		t1<\/sub>
\nmin<\/td>\n		et1<\/sub>
\nmax<\/td>\n		d1<\/sub>
\nTol\u00e9rance<\/td>\n		t1<\/sub>
\nmin<\/td>\n		et1<\/sub>
\nmax<\/td>\n		d1<\/sub>
\nTol\u00e9rance<\/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
Le fumage n'est pas d\u00e9fini mais est autoris\u00e9.<\/td>\nBande de d\u00e9chirure (e1<\/sub>), t1<\/sub> et le br\u00fblage non d\u00e9fini mais autoris\u00e9<\/td>\n<\/tr>\n
t1<\/sub> est la portion du trou comprise dans la tol\u00e9rance sp\u00e9cifi\u00e9e de d1<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.2 Diam\u00e8tre ext\u00e9rieur d2<\/sub><\/div>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u00c9paisseur<\/th>\nTol\u00e9rances<\/th>\n<\/tr>\n
Qualit\u00e9 du produit<\/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>
\nTol\u00e9rance<\/td>\n		et2<\/sub>
\nmax<\/td>\n		d2<\/sub>
\nTol\u00e9rance<\/td>\n		et2<\/sub>
\nmax<\/td>\n		d2<\/sub>
\nTol\u00e9rance<\/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 et t2<\/sub> non d\u00e9fini mais autoris\u00e9<\/td>\nBande de d\u00e9chirure (e2<\/sub>), t2<\/sub> et le br\u00fblage non d\u00e9fini mais autoris\u00e9<\/td>\n<\/tr>\n
t2<\/sub> est la portion du diam\u00e8tre ext\u00e9rieur comprise dans la tol\u00e9rance sp\u00e9cifi\u00e9e de d2<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.3 \u00c9paisseur t<\/div>\n

Tol\u00e9rances d'\u00e9paisseur mesur\u00e9es apr\u00e8s \u00e9bavurage.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u00c9paisseur t<\/th>\nQualit\u00e9 du produit<\/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 Chanfreins<\/div>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n
\u00c9paisseur nominale<\/th>\nQualit\u00e9 du produit<\/th>\n<\/tr>\n
F<\/th>\nUN<\/th>\nC<\/th>\n<\/tr>\n
c1<\/sub>
\nmin<\/th>\n		c2<\/sub>
\nmin<\/th>\n		c1<\/sub>
\nmin<\/th>\n		c2<\/sub>
\nmin<\/th>\n		c1<\/sub>
\nmin<\/th>\n		c2<\/sub>
\nmin<\/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 Exigences suppl\u00e9mentaires relatives aux laveuses combin\u00e9es<\/div>\n

\u00c0 la demande de l'acheteur, la position du chanfrein par rapport aux \u00e9carts d'estampage doit \u00eatre pr\u00e9cis\u00e9e dans la commande.<\/p>\n

4.5 Tol\u00e9rances de forme et de position<\/div>\n

\u0394t s'applique en dehors de x = 0,1 (d2<\/sub> - d1<\/sub>), c'est-\u00e0-dire 60% de largeur d'anneau.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u00c9paisseur t<\/th>\nQualit\u00e9 du produit<\/th>\n<\/tr>\n
F<\/th>\nUN<\/th>\nC<\/th>\n<\/tr>\n
\u0394t
\nmax<\/th>\n		\u0394t
\nmax<\/th>\n		<\/th>\n<\/tr>\n<\/thead>\n
t \u2264 0,5<\/td>\n0.02<\/td>\n0.025<\/td>\nAucune exigence<\/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 Coaxialit\u00e9 y<\/div>\n\n\n\n\n\n\n\n\n\n\n
\u00c9paisseur t<\/th>\nQualit\u00e9 du produit<\/th>\n<\/tr>\n
F<\/th>\nUN<\/th>\nC<\/th>\n<\/tr>\n
y
\nmax<\/th>\n		y
\nmax<\/th>\n		y
\nmax<\/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
Tol\u00e9rance y bas\u00e9e sur le diam\u00e8tre d2<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.5.3 Plan\u00e9it\u00e9 (d\u00e9flexion) z<\/div>\n

La plan\u00e9it\u00e9 z est la diff\u00e9rence entre la hauteur effective heff<\/sub> et l'\u00e9paisseur effective teff<\/sub>Remarque\u00a0: Ind\u00e9pendant de la tol\u00e9rance d\u2019\u00e9paisseur\u00a0; des proc\u00e9d\u00e9s suppl\u00e9mentaires comme le meulage peuvent r\u00e9duire la fl\u00e8che. Mesur\u00e9 apr\u00e8s \u00e9bavurage.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u00c9paisseur t<\/th>\nQualit\u00e9 du produit<\/th>\n<\/tr>\n
F<\/th>\nUN<\/th>\nC<\/th>\n<\/tr>\n
z
\nmax<\/th>\n		z
\nmax<\/th>\n		z
\nmax<\/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. Exigences cl\u00e9s de la norme GB\/T 3103.3-2020<\/h2>\n

Les tol\u00e9rances doivent \u00eatre v\u00e9rifi\u00e9es avant le traitement de surface. En cas de divergence, les normes du produit pr\u00e9valent. Les mesures d'\u00e9paisseur et de plan\u00e9it\u00e9 sont effectu\u00e9es apr\u00e8s l'\u00e9bavurage afin de garantir la pr\u00e9cision.<\/p>\n<\/div>\n

<\/p>\n

\n

6. Analyse de la pr\u00e9cision et des erreurs<\/h2>\n

Des erreurs peuvent survenir lors de proc\u00e9d\u00e9s de fabrication tels que l'emboutissage, entra\u00eenant des bavures ou des probl\u00e8mes de coaxialit\u00e9. Am\u00e9liorez la pr\u00e9cision gr\u00e2ce \u00e0 un outillage pr\u00e9cis et un post-traitement ad\u00e9quat. Parmi les erreurs courantes, on peut citer le non-respect des sp\u00e9cifications de chanfreinage\u00a0; corrigez ce probl\u00e8me en vous r\u00e9f\u00e9rant aux tableaux sp\u00e9cifiques \u00e0 chaque nuance.<\/p>\n<\/div>\n

<\/p>\n

\n

7. Impact de la norme GB\/T 3103.3-2020 sur l'industrie<\/h2>\n

Cette norme am\u00e9liore la recherche sur les mat\u00e9riaux en normalisant les tol\u00e9rances, facilite le contr\u00f4le de la qualit\u00e9 dans la fabrication et soutient les applications dans des secteurs de haute pr\u00e9cision comme l'a\u00e9rospatiale, o\u00f9 les rondelles de grade A garantissent la fiabilit\u00e9.<\/p>\n<\/div>\n

<\/p>\n

\n

8. Foire aux questions (FAQ)<\/h2>\n
\n

Quelle est la diff\u00e9rence entre les cat\u00e9gories de produits A, C et F\u00a0?<\/h3>\n

La qualit\u00e9 A offre les tol\u00e9rances les plus serr\u00e9es pour les applications de pr\u00e9cision, la qualit\u00e9 C pour une utilisation g\u00e9n\u00e9rale et la qualit\u00e9 F pour des tol\u00e9rances fines dans des sc\u00e9narios sp\u00e9cifiques, comme d\u00e9taill\u00e9 dans les tableaux.<\/p>\n<\/div>\n

\n

Quand faut-il mesurer les tol\u00e9rances\u00a0?<\/h3>\n

Des tol\u00e9rances s'appliquent avant le traitement de surface, l'\u00e9paisseur et la plan\u00e9it\u00e9 \u00e9tant mesur\u00e9es apr\u00e8s \u00e9bavurage afin d'\u00e9viter les impr\u00e9cisions dues aux d\u00e9fauts de fabrication.<\/p>\n<\/div>\n

\n

Comment cette norme se compare-t-elle \u00e0 la norme ISO 4759-3\u00a0?<\/h3>\n

La norme GB\/T 3103.3-2020 est \u00e9quivalente \u00e0 la norme ISO 4759-3:2016, garantissant une compatibilit\u00e9 mondiale pour les tol\u00e9rances sur les rondelles plates.<\/p>\n<\/div>\n

\n

Que se passe-t-il si les normes de produits diff\u00e8rent de celles-ci\u00a0?<\/h3>\n

Les normes sp\u00e9cifiques au produit pr\u00e9valent, mais toute d\u00e9rogation n\u00e9cessite une justification technique.<\/p>\n<\/div>\n

\n

Les chanfreins sont-ils obligatoires ?<\/h3>\n

Des chanfreins minimaux sont sp\u00e9cifi\u00e9s pour \u00e9viter les ar\u00eates vives, avec des valeurs bas\u00e9es sur l'\u00e9paisseur et la qualit\u00e9 ; pour les rondelles combin\u00e9es, la position peut n\u00e9cessiter une sp\u00e9cification.<\/p>\n<\/div>\n

\n

Comment choisir la note appropri\u00e9e pour une candidature ?<\/h3>\n

Choisissez en fonction de la pr\u00e9cision d'assemblage\u00a0: A pour les pi\u00e8ces critiques soumises \u00e0 de fortes charges, C pour le boulonnage standard, en tenant compte de facteurs tels que les vibrations et la r\u00e9partition de la charge.<\/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":"

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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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