{"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\/pt\/blog\/gb-t-3103-3-2020-flat-washer-tolerances-guide\/","title":{"rendered":"Guia de Toler\u00e2ncias para Arruelas Planas GB\/T 3103.3-2020"},"content":{"rendered":"

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<\/p>\n

Guia de Toler\u00e2ncias para Arruelas Planas GB\/T 3103.3-2020<\/h1>\n
Toler\u00e2ncias para arruelas planas<\/div>\n

<\/p>\n

\n

1. Introdu\u00e7\u00e3o<\/h2>\n

As arruelas planas desempenham um papel fundamental nos sistemas de fixa\u00e7\u00e3o, distribuindo cargas, prevenindo danos \u00e0 superf\u00edcie e garantindo a integridade da montagem. A norma GB\/T 3103.3-2020 especifica as toler\u00e2ncias para arruelas planas com di\u00e2metros nominais de 1 mm a 150 mm, aplic\u00e1veis \u200b\u200b\u00e0s classes de produto A, C e F. Essa norma \u00e9 essencial para manter a precis\u00e3o nas ind\u00fastrias de engenharia mec\u00e2nica, automotiva, aeroespacial e da constru\u00e7\u00e3o civil.<\/p>\n

Adaptado da norma ISO 4759-3:2016, este guia garante a compatibilidade com as pr\u00e1ticas internacionais, promovendo o controle de qualidade e a intercambialidade. Ele detalha as toler\u00e2ncias para furos internos, di\u00e2metro externo, espessura, chanfros e atributos de forma\/posi\u00e7\u00e3o, auxiliando os engenheiros no projeto e na aquisi\u00e7\u00e3o de pe\u00e7as.<\/p>\n<\/div>\n

<\/p>\n

\n

2. Vis\u00e3o geral da norma GB\/T 3103.3-2020<\/h2>\n

Publicada em 2020 pela Administra\u00e7\u00e3o de Padroniza\u00e7\u00e3o da China, esta norma atualiza as vers\u00f5es anteriores para estar em conformidade com os avan\u00e7os globais na tecnologia de fixadores. Ela se aplica a arruelas planas usadas com parafusos, porcas e arruelas de press\u00e3o, excluindo tipos especiais como arruelas de press\u00e3o.<\/p>\n

O conte\u00fado principal inclui toler\u00e2ncias dimensionais antes do tratamento de superf\u00edcie, com disposi\u00e7\u00f5es para desvios apenas quando tecnicamente justificados. As toler\u00e2ncias de forma e posi\u00e7\u00e3o seguem as normas GB\/T 1182 e GB\/T 16671.<\/p>\n<\/div>\n

<\/p>\n

\n

3. Princ\u00edpios b\u00e1sicos de toler\u00e2ncias de arruelas planas<\/h2>\n

As toler\u00e2ncias garantem que as arruelas se encaixem com precis\u00e3o nas montagens, evitando falhas devido a desalinhamento ou folga excessiva. Elas s\u00e3o definidas para as classes de produto: A (precis\u00e3o), C (geral) e F (fino). Salvo especifica\u00e7\u00e3o em contr\u00e1rio, as toler\u00e2ncias se aplicam ao pr\u00e9-tratamento.<\/p>\n

Os principais par\u00e2metros incluem o di\u00e2metro interno (d).1<\/sub>), di\u00e2metro externo (d2<\/sub>), espessura (t), chanfros (c1<\/sub>, c2<\/sub>), e toler\u00e2ncias de forma como coaxialidade e planicidade.<\/p>\n<\/div>\n

<\/p>\n

\n

4. Especifica\u00e7\u00f5es detalhadas de toler\u00e2ncia<\/h2>\n
4.1 Orif\u00edcio interno d1<\/sub><\/div>\n

 <\/p>\n

Toler\u00e2ncias para furo interno d1<\/sub> Os valores variam de acordo com a espessura e a qualidade do produto.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Grossura<\/th>\nToler\u00e2ncias<\/th>\n<\/tr>\n
Grau do produto<\/th>\n<\/tr>\n
F<\/th>\nUM<\/th>\nC<\/th>\n<\/tr>\n<\/thead>\n
t < 2
\n2 \u2264 t < 4
\nt \u2265 4<\/td>\n		d1<\/sub>
\nToler\u00e2ncia<\/td>\n		t1<\/sub>
\nmin<\/td>\n		e1<\/sub>
\nm\u00e1ximo<\/td>\n		d1<\/sub>
\nToler\u00e2ncia<\/td>\n		t1<\/sub>
\nmin<\/td>\n		e1<\/sub>
\nm\u00e1ximo<\/td>\n		d1<\/sub>
\nToler\u00e2ncia<\/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
A queima n\u00e3o foi definida, mas \u00e9 permitida.<\/td>\nFaixa de l\u00e1grima (e1<\/sub>), t1<\/sub> e o ato de enterrar n\u00e3o foi definido, mas \u00e9 permitido.<\/td>\n<\/tr>\n
t1<\/sub> \u00e9 a por\u00e7\u00e3o do furo dentro da toler\u00e2ncia especificada de d1<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4,2 Di\u00e2metro externo d2<\/sub><\/div>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Grossura<\/th>\nToler\u00e2ncias<\/th>\n<\/tr>\n
Grau do produto<\/th>\n<\/tr>\n
F<\/th>\nUM<\/th>\nC<\/th>\n<\/tr>\n<\/thead>\n
t < 2
\n2 \u2264 t < 4
\nt \u2265 4<\/td>\n		d2<\/sub>
\nToler\u00e2ncia<\/td>\n		e2<\/sub>
\nm\u00e1ximo<\/td>\n		d2<\/sub>
\nToler\u00e2ncia<\/td>\n		e2<\/sub>
\nm\u00e1ximo<\/td>\n		d2<\/sub>
\nToler\u00e2ncia<\/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> n\u00e3o definido, mas permitido<\/td>\nFaixa de l\u00e1grima (e2<\/sub>), t2<\/sub> e o ato de enterrar n\u00e3o foi definido, mas \u00e9 permitido.<\/td>\n<\/tr>\n
t2<\/sub> \u00e9 a por\u00e7\u00e3o do di\u00e2metro externo dentro da toler\u00e2ncia especificada de d2<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.3 Espessura t<\/div>\n

Toler\u00e2ncias de espessura medidas ap\u00f3s a remo\u00e7\u00e3o de rebarbas.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Espessura t<\/th>\nGrau do produto<\/th>\n<\/tr>\n
F<\/th>\nUM<\/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 Chanfros<\/div>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n
Espessura nominal<\/th>\nGrau do produto<\/th>\n<\/tr>\n
F<\/th>\nUM<\/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 Requisitos Suplementares para Lavadoras Combinadas<\/div>\n

A pedido do comprador, a posi\u00e7\u00e3o do chanfro em rela\u00e7\u00e3o aos desvios de estampagem deve ser especificada no pedido.<\/p>\n

4.5 Toler\u00e2ncias de Forma e Posi\u00e7\u00e3o<\/div>\n

\u0394t se aplica fora de x = 0,1 (d2<\/sub> \u2013 d1<\/sub>), ou seja, 60% de largura do anel.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Espessura t<\/th>\nGrau do produto<\/th>\n<\/tr>\n
F<\/th>\nUM<\/th>\nC<\/th>\n<\/tr>\n
\u0394t
\nm\u00e1ximo<\/th>\n		\u0394t
\nm\u00e1ximo<\/th>\n		<\/th>\n<\/tr>\n<\/thead>\n
t \u2264 0,5<\/td>\n0.02<\/td>\n0.025<\/td>\nSem requisitos<\/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 Coaxialidade y<\/div>\n\n\n\n\n\n\n\n\n\n\n
Espessura t<\/th>\nGrau do produto<\/th>\n<\/tr>\n
F<\/th>\nUM<\/th>\nC<\/th>\n<\/tr>\n
y
\nm\u00e1ximo<\/th>\n		y
\nm\u00e1ximo<\/th>\n		y
\nm\u00e1ximo<\/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
Toler\u00e2ncia y baseada no di\u00e2metro d2<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.5.3 Planicidade (Deflex\u00e3o) z<\/div>\n

A planicidade z \u00e9 a diferen\u00e7a entre a altura efetiva hefe<\/sub> e espessura efetiva tefe<\/sub>Nota: Independente da toler\u00e2ncia de espessura; processos adicionais como retifica\u00e7\u00e3o podem reduzir a deflex\u00e3o. Medido ap\u00f3s a rebarba\u00e7\u00e3o.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Espessura t<\/th>\nGrau do produto<\/th>\n<\/tr>\n
F<\/th>\nUM<\/th>\nC<\/th>\n<\/tr>\n
por
\nm\u00e1ximo<\/th>\n		por
\nm\u00e1ximo<\/th>\n		por
\nm\u00e1ximo<\/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. Requisitos principais da norma GB\/T 3103.3-2020<\/h2>\n

As toler\u00e2ncias devem ser verificadas antes do tratamento da superf\u00edcie. Em caso de diverg\u00eancia, prevalecem as normas do produto. As medi\u00e7\u00f5es de espessura e planicidade s\u00e3o realizadas ap\u00f3s o desbarbamento para garantir a precis\u00e3o.<\/p>\n<\/div>\n

<\/p>\n

\n

6. Precis\u00e3o e An\u00e1lise de Erros<\/h2>\n

Erros podem surgir em processos de fabrica\u00e7\u00e3o como estampagem, levando a rebarbas ou problemas de coaxialidade. Melhore a precis\u00e3o atrav\u00e9s de ferramentas de precis\u00e3o e p\u00f3s-processamento. Erros comuns incluem ignorar as especifica\u00e7\u00f5es de chanfro; resolva-os seguindo as tabelas espec\u00edficas para cada classe de material.<\/p>\n<\/div>\n

<\/p>\n

\n

7. Impacto da norma GB\/T 3103.3-2020 na ind\u00fastria<\/h2>\n

Esta norma aprimora a pesquisa de materiais ao padronizar as toler\u00e2ncias, auxilia no controle de qualidade na fabrica\u00e7\u00e3o e oferece suporte a aplica\u00e7\u00f5es em setores de alta precis\u00e3o, como o aeroespacial, onde arruelas de grau A garantem confiabilidade.<\/p>\n<\/div>\n

<\/p>\n

\n

8. Perguntas Frequentes (FAQ)<\/h2>\n
\n

Qual a diferen\u00e7a entre os produtos de grau A, C e F?<\/h3>\n

A classe A oferece as toler\u00e2ncias mais rigorosas para aplica\u00e7\u00f5es de precis\u00e3o, a classe C para uso geral e a classe F para toler\u00e2ncias finas em cen\u00e1rios espec\u00edficos, conforme detalhado nas tabelas.<\/p>\n<\/div>\n

\n

Quando as toler\u00e2ncias devem ser medidas?<\/h3>\n

As toler\u00e2ncias s\u00e3o aplicadas antes do tratamento da superf\u00edcie, com a espessura e a planicidade medidas ap\u00f3s a remo\u00e7\u00e3o das rebarbas para evitar imprecis\u00f5es decorrentes de artefatos de fabrica\u00e7\u00e3o.<\/p>\n<\/div>\n

\n

Como essa norma se compara \u00e0 ISO 4759-3?<\/h3>\n

A norma GB\/T 3103.3-2020 \u00e9 equivalente \u00e0 ISO 4759-3:2016, garantindo a compatibilidade global das toler\u00e2ncias em arruelas planas.<\/p>\n<\/div>\n

\n

E se os padr\u00f5es do produto forem diferentes disso?<\/h3>\n

As normas espec\u00edficas do produto t\u00eam prioridade, mas os desvios exigem justificativa t\u00e9cnica.<\/p>\n<\/div>\n

\n

Os chanfros s\u00e3o obrigat\u00f3rios?<\/h3>\n

Os chanfros m\u00ednimos s\u00e3o especificados para evitar arestas vivas, com valores baseados na espessura e na classe; para arruelas combinadas, a posi\u00e7\u00e3o pode precisar ser especificada.<\/p>\n<\/div>\n

\n

Como selecionar a nota adequada para uma candidatura?<\/h3>\n

Escolha com base na precis\u00e3o da montagem: A para pe\u00e7as cr\u00edticas de alta carga, C para parafusos padr\u00e3o, considerando fatores como vibra\u00e7\u00e3o e distribui\u00e7\u00e3o de carga.<\/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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