Technical Section
Tolerances Used for Standard Metric and
Inch Size Keyways and Square Holes
Metric Size Keyways
Keyway Size Tolerance
2 mm 6 mm + .001 inches
0
8 mm 12 mm + .002 inches
0
Inch Size Keyways
Keyway Size Tolerance
.0625 .250 inches + .001 inches
0
.3125 .500 inches + .002 inches
0
Metric Size Squares
Square Size Tolerance
2 mm 12 mm + .001 inches
0
13 mm 22 mm + .002 inches
0
24 mm 26 mm + .003 inches
0
Inch Size Squares
Square Size Tolerance
.125 .500 inches + .001 inches
0
.5625 .875 inches + .002 inches
0
1.00 1.250 inches + .003 inches
0
To DIN 79 Square Bore Tolerances

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