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Part Tolerances

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

Linear Dimensions - ISO 2769-1
Tolerance ClassLimit Deviations in mm for nominal dimension ranges
0.5-3>3-6>6-30>30-120>120-400>400-1000>1000-2000>2000-4000
Fine± 0.05± 0.05± 0.1± 0.15± 0.2± 0.3± 0.5± -
Medium± 0.1± 0.1± 0.2± 0.3± 0.5± 0.8± 1.2± 2
Coarse± 0.2± 0.3± 0.5± 0.8± 1.2± 2± 3± 4
Very Coarse± -± 0.5± 1± 1.5± 2.5± 4± 6± 8
Radii and Chamfers - ISO 2769-1
Tolerance ClassLimit Deviations in mm for nominal dimension ranges
0.5-3>3-6>6
Fine± 0.2± 0.5± 1
Medium
Coarse± 0.4± 1± 2
Very Coarse
Angular Dimensions - ISO 2769-1
Tolerance ClassLimit Deviations in mm for nominal dimension ranges
0-10>10-50>50-120>120-400>400
Fine± 1°± 0.5°± 0.33°± 0.167°± 0.083°
Medium
Coarse± 1.5°± 1°± 0.5°± 0.25°± 0.167°
Very Coarse± 3°± 2°± 1°± 0.5°± 0.33°
Straightness and Flatness - ISO 2769-2
Tolerance ClassLimit Deviations in mm for nominal dimension ranges
0-10>10-30>30-100>100-300>300-1000>1000-3000
H± 0.02± 0.05± 0.1± 0.2± 0.3± 0.4
K± 0.05± 0.1± 0.2± 0.4± 0.6± 0.8
L± 0.1± 0.2± 0.4± 0.8± 1.2± 1.6
Perpendicularity - ISO 2769-2
Tolerance ClassLimit Deviations in mm for nominal dimension ranges
0-100>100-300>300-1000>1000-3000
H± 0.2± 0.3± 0.4± 0.5
K± 0.4± 0.6± 0.8± 1
L± 0.6± 1± 1.5± 2
Symmetry - ISO 2769-2
Tolerance ClassLimit Deviations in mm for nominal dimension ranges
0-100>100-300>300-1000>1000-3000
H± 0.5
K± 0.6± 0.8± 1
L± 0.6± 1± 1.5± 2

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