{"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\/de\/blog\/gb-t-3103-3-2020-flat-washer-tolerances-guide\/","title":{"rendered":"GB\/T 3103.3-2020 Toleranzleitfaden f\u00fcr Unterlegscheiben"},"content":{"rendered":"

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GB\/T 3103.3-2020 Toleranzleitfaden f\u00fcr Unterlegscheiben<\/h1>\n
Toleranzen f\u00fcr Unterlegscheiben<\/div>\n

<\/p>\n

\n

1. Einleitung<\/h2>\n

Flachscheiben spielen eine entscheidende Rolle in Befestigungssystemen, indem sie Lasten verteilen, Oberfl\u00e4chenbesch\u00e4digungen verhindern und die Stabilit\u00e4t der Montage gew\u00e4hrleisten. Die Norm GB\/T 3103.3-2020 legt Toleranzen f\u00fcr einfache Flachscheiben mit Nenndurchmessern von 1 mm bis 150 mm f\u00fcr die G\u00fcteklassen A, C und F fest. Diese Norm ist unerl\u00e4sslich f\u00fcr die Pr\u00e4zision im Maschinenbau, der Automobilindustrie, der Luft- und Raumfahrt sowie im Bauwesen.<\/p>\n

Diese Richtlinie, die auf ISO 4759-3:2016 basiert, gew\u00e4hrleistet die Kompatibilit\u00e4t mit internationalen Standards und f\u00f6rdert Qualit\u00e4tskontrolle und Austauschbarkeit. Sie beschreibt detailliert Toleranzen f\u00fcr Innenbohrung, Au\u00dfendurchmesser, Wandst\u00e4rke, Fasen und Form-\/Lageeigenschaften und unterst\u00fctzt Ingenieure bei Konstruktion und Beschaffung.<\/p>\n<\/div>\n

<\/p>\n

\n

2. GB\/T 3103.3-2020 Standard\u00fcbersicht<\/h2>\n

Diese 2020 von der chinesischen Normungsbeh\u00f6rde ver\u00f6ffentlichte Norm aktualisiert fr\u00fchere Versionen, um sie an die weltweiten Fortschritte in der Verbindungstechnik anzupassen. Sie gilt f\u00fcr einfache Unterlegscheiben, die mit Schrauben und Muttern verwendet werden, mit Ausnahme von Sondertypen wie Sicherungsscheiben.<\/p>\n

Zu den wichtigsten Inhalten geh\u00f6ren Ma\u00dftoleranzen vor der Oberfl\u00e4chenbehandlung, wobei Abweichungen nur bei technischer Begr\u00fcndung zul\u00e4ssig sind. Form- und Lagetoleranzen richten sich nach GB\/T 1182 und GB\/T 16671.<\/p>\n<\/div>\n

<\/p>\n

\n

3. Grundprinzipien der Toleranzen f\u00fcr Unterlegscheiben<\/h2>\n

Toleranzen gew\u00e4hrleisten den pr\u00e4zisen Sitz der Unterlegscheiben in Baugruppen und verhindern so Ausf\u00e4lle durch Fehlausrichtung oder \u00fcberm\u00e4\u00dfiges Spiel. Sie sind f\u00fcr die Produktklassen A (Pr\u00e4zision), C (Standard) und F (Fein) definiert. Sofern nicht anders angegeben, gelten die Toleranzen f\u00fcr die Vorbehandlung.<\/p>\n

Zu den wichtigsten Parametern geh\u00f6rt der Innendurchmesser (d).1<\/sub>), Au\u00dfendurchmesser (d2<\/sub>), Dicke (t), Fasen (c1<\/sub>, C2<\/sub>) sowie Formtoleranzen wie Koaxialit\u00e4t und Ebenheit.<\/p>\n<\/div>\n

<\/p>\n

\n

4. Detaillierte Toleranzvorgaben<\/h2>\n
4.1 Innenbohrung d1<\/sub><\/div>\n

 <\/p>\n

Toleranzen f\u00fcr die Innenbohrung d1<\/sub> variieren je nach Dicke und Produktqualit\u00e4t.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Dicke<\/th>\nToleranzen<\/th>\n<\/tr>\n
Produktqualit\u00e4t<\/th>\n<\/tr>\n
F<\/th>\nA<\/th>\nC<\/th>\n<\/tr>\n<\/thead>\n
t < 2
\n2 \u2264 t < 4
\nt \u2265 4<\/td>\n		D1<\/sub>
\nToleranz<\/td>\n		T1<\/sub>
\nmin<\/td>\n		e1<\/sub>
\nmax<\/td>\n		D1<\/sub>
\nToleranz<\/td>\n		T1<\/sub>
\nmin<\/td>\n		e1<\/sub>
\nmax<\/td>\n		D1<\/sub>
\nToleranz<\/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
Verleimen ist nicht definiert, aber zul\u00e4ssig.<\/td>\nTr\u00e4nenstreifen (e1<\/sub>), T1<\/sub> und das Verleimen ist nicht definiert, aber zul\u00e4ssig.<\/td>\n<\/tr>\n
T1<\/sub> ist der Teil des Lochs innerhalb der vorgegebenen Toleranz von d1<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.2 Au\u00dfendurchmesser d2<\/sub><\/div>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Dicke<\/th>\nToleranzen<\/th>\n<\/tr>\n
Produktqualit\u00e4t<\/th>\n<\/tr>\n
F<\/th>\nA<\/th>\nC<\/th>\n<\/tr>\n<\/thead>\n
t < 2
\n2 \u2264 t < 4
\nt \u2265 4<\/td>\n		D2<\/sub>
\nToleranz<\/td>\n		e2<\/sub>
\nmax<\/td>\n		D2<\/sub>
\nToleranz<\/td>\n		e2<\/sub>
\nmax<\/td>\n		D2<\/sub>
\nToleranz<\/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 und t2<\/sub> nicht definiert, aber zul\u00e4ssig<\/td>\nTr\u00e4nenstreifen (e2<\/sub>), T2<\/sub> und das Verleimen ist nicht definiert, aber zul\u00e4ssig.<\/td>\n<\/tr>\n
T2<\/sub> ist der Teil des Au\u00dfendurchmessers innerhalb der vorgegebenen Toleranz von d2<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.3 Dicke t<\/div>\n

Dickentoleranzen wurden nach dem Entgraten gemessen.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Dicke t<\/th>\nProduktqualit\u00e4t<\/th>\n<\/tr>\n
F<\/th>\nA<\/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 Fasen<\/div>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n
Nenndicke<\/th>\nProduktqualit\u00e4t<\/th>\n<\/tr>\n
F<\/th>\nA<\/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 Zus\u00e4tzliche Anforderungen an kombinierte Unterlegscheiben<\/div>\n

Auf Wunsch des K\u00e4ufers sollte die Position der Fasen in Bezug auf Stanzabweichungen in der Bestellung angegeben werden.<\/p>\n

4.5 Form- und Lagetoleranzen<\/div>\n

\u0394t gilt au\u00dferhalb von x = 0,1 (d2<\/sub> - D1<\/sub>), d.h. 60% mit einer Ringbreite von 60%.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Dicke t<\/th>\nProduktqualit\u00e4t<\/th>\n<\/tr>\n
F<\/th>\nA<\/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>\nKeine Anforderung<\/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 Koaxialit\u00e4t y<\/div>\n\n\n\n\n\n\n\n\n\n\n
Dicke t<\/th>\nProduktqualit\u00e4t<\/th>\n<\/tr>\n
F<\/th>\nA<\/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
Toleranz y basierend auf dem Durchmesser d2<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.5.3 Ebenheit (Durchbiegung) z<\/div>\n

Die Ebenheit z ist die Differenz zwischen der effektiven H\u00f6he hEffekt<\/sub> und effektive Dicke tEffekt<\/sub>Hinweis: Unabh\u00e4ngig von der Dickentoleranz; zus\u00e4tzliche Bearbeitungsprozesse wie Schleifen k\u00f6nnen die Durchbiegung verringern. Gemessen nach dem Entgraten.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Dicke t<\/th>\nProduktqualit\u00e4t<\/th>\n<\/tr>\n
F<\/th>\nA<\/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. Wichtigste Anforderungen in GB\/T 3103.3-2020<\/h2>\n

Die Toleranzen m\u00fcssen vor der Oberfl\u00e4chenbehandlung \u00fcberpr\u00fcft werden. Bei Abweichungen haben die Produktnormen Vorrang. Die Messungen von Dicke und Ebenheit erfolgen nach dem Entgraten, um die Genauigkeit zu gew\u00e4hrleisten.<\/p>\n<\/div>\n

<\/p>\n

\n

6. Pr\u00e4zisions- und Fehleranalyse<\/h2>\n

Bei Fertigungsprozessen wie dem Stanzen k\u00f6nnen Fehler auftreten, die zu Graten oder Problemen mit der Koaxialit\u00e4t f\u00fchren. Die Genauigkeit l\u00e4sst sich durch pr\u00e4zise Werkzeuge und Nachbearbeitung verbessern. H\u00e4ufige Fehler sind das Ignorieren von Fasenvorgaben; dies l\u00e4sst sich durch die Einhaltung sortenspezifischer Tabellen beheben.<\/p>\n<\/div>\n

<\/p>\n

\n

7. Auswirkungen von GB\/T 3103.3-2020 auf die Industrie<\/h2>\n

Dieser Standard verbessert die Materialforschung durch die Standardisierung von Toleranzen, unterst\u00fctzt die Qualit\u00e4tskontrolle in der Fertigung und f\u00f6rdert Anwendungen in hochpr\u00e4zisen Sektoren wie der Luft- und Raumfahrt, wo Unterlegscheiben der G\u00fcteklasse A f\u00fcr Zuverl\u00e4ssigkeit sorgen.<\/p>\n<\/div>\n

<\/p>\n

\n

8. H\u00e4ufig gestellte Fragen (FAQ)<\/h2>\n
\n

Worin besteht der Unterschied zwischen den Produktklassen A, C und F?<\/h3>\n

G\u00fcteklasse A bietet die engsten Toleranzen f\u00fcr Pr\u00e4zisionsanwendungen, G\u00fcteklasse C f\u00fcr den allgemeinen Gebrauch und G\u00fcteklasse F f\u00fcr feine Toleranzen in bestimmten Anwendungsf\u00e4llen, wie in den Tabellen detailliert aufgef\u00fchrt.<\/p>\n<\/div>\n

\n

Wann sollten Toleranzen gemessen werden?<\/h3>\n

Vor der Oberfl\u00e4chenbehandlung gelten Toleranzen; Dicke und Ebenheit werden nach dem Entgraten gemessen, um Ungenauigkeiten durch Fertigungsfehler zu vermeiden.<\/p>\n<\/div>\n

\n

Wie verh\u00e4lt sich diese Norm zu ISO 4759-3?<\/h3>\n

GB\/T 3103.3-2020 entspricht ISO 4759-3:2016 und gew\u00e4hrleistet somit die weltweite Kompatibilit\u00e4t der Toleranzen f\u00fcr Unterlegscheiben.<\/p>\n<\/div>\n

\n

Was, wenn die Produktstandards davon abweichen?<\/h3>\n

Produktspezifische Normen haben Vorrang, Abweichungen bed\u00fcrfen jedoch einer technischen Begr\u00fcndung.<\/p>\n<\/div>\n

\n

Sind Fasen zwingend erforderlich?<\/h3>\n

Um scharfe Kanten zu vermeiden, werden Mindestfasen vorgeschrieben, deren Werte von der Dicke und G\u00fcteklasse abh\u00e4ngen; bei kombinierten Unterlegscheiben muss gegebenenfalls die Position angegeben werden.<\/p>\n<\/div>\n

\n

Wie w\u00e4hlt man die passende Note f\u00fcr eine Bewerbung aus?<\/h3>\n

Die Wahl erfolgt anhand der Montagegenauigkeit: A f\u00fcr hochbelastete, kritische Bauteile, C f\u00fcr Standardverschraubungen, wobei Faktoren wie Vibrationen und Lastverteilung zu ber\u00fccksichtigen sind.<\/p>\n<\/div>\n<\/div>\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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