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Quality · International tolerance specs

Precision Standards

ISO 1328 · DIN 3962 · AGMA 2000 · JIS B 1702 — and how their classes map to each other.

Customers from different regions arrive with different tolerance languages. Wolfer cuts and inspects to ISO 1328 by default, and provides documented translations to DIN, AGMA, and JIS classes when the customer drawing specifies them.

Last updated Reviewed by Luo Genwen, Production Plant Manager

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Class translations are approximate — different standards measure pitch, profile, and lead error differently, so a perfect 1-to-1 map doesn't exist. For high-stakes orders we always cut to the customer's named standard and provide the inspection report in that standard's units.

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Standards we work against

ISO 1328-1:2013

Cylindrical gear accuracy — the modern international default. Classes 1 (highest) to 11 (lowest). Wolfer routinely produces ISO 1328 Class 5–8 gears.

DIN 3962 / 3963

German gear-tolerance system. Used by many European OEMs. Translates approximately to ISO 1328 Class 4–9.

AGMA 2000-A88

Older American standard. Classes run Q1 (lowest) to Q15 (highest); maps roughly to ISO 1328 Class 11 down to Class 1.

AGMA 2015

Newer American replacement for AGMA 2000, with class definitions closer to ISO 1328. We translate either way for US customers.

JIS B 1702-1

Japanese standard — used by Japanese OEM customers and their Chinese subsidiaries. Maps closely to ISO 1328.

KHK / KISSsoft sizing

For non-standard module / pressure-angle gears, we accept KISSsoft or KHK design output as the input drawing.

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Class crosswalk — approximate, for guidance

Class crosswalk — approximate, for guidance
ISO 1328-1DIN 3962AGMA 2000 (Q)AGMA 2015 (A)JIS B 1702-1
Class 4 (very high)4Q13 / Q14A4N4
Class 5 (Wolfer ground standard)5Q12 / Q13A5N5
Class 6 (Wolfer hobbed standard)6Q10 / Q11A6N6
Class 77Q9 / Q10A7N7
Class 88Q8 / Q9A8N8

ISO 1328 vs. DIN vs. AGMA vs. JIS: gear accuracy classes →

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ISO 1328 vs. DIN vs. AGMA vs. JIS: gear accuracy classes

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Module vs. diametral pitch (DP): conversion and drawing basics

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