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Assembly Tolerances

Assembly tolerances should be calculated on a case by case basis - however these tables are a good general guide for tolerance bands

Linear Dimensions - ISO 13920
Tolerance ClassLimit Deviations in mm for nominal dimension ranges
2-30>30-120>120-400>400-1000>1000-2000>2000-4000>4000-8000>8000-12000>12000-16000>16000-20000>20000
A± 1± 1± 1± 2± 3± 4± 5± 6± 7± 8± 9
B± 2± 2± 3± 4± 6± 8± 10± 12± 14± 16
C± 3± 4± 6± 8± 11± 14± 18± 21± 24± 27
D± 4± 7± 9± 12± 16± 21± 27± 32± 36± 40
Angular Dimensions - ISO 13920
Tolerance ClassLimit Deviations in mm for nominal dimension ranges
0-400>400-1000>1000
A± 0.33°± 0.25°± 0.167°
B± 0.75°± 0.5°± 0.33°
C± 1°± 0.75°± 0.5°
D± 1.5°± 1.25°± 1°

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