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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