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Sprocket Tolerances & Standards

Setscrew Size & Keyway Size By Bore Size*

The standard serscrew size and keyway size is based on the bore size of the sprocket.

Bore Size Keyway Set Screw Size
*3/8" *None*None
*1/2" to 9/16" *1/8" X 1/16" *10-24
5/8" to 7/8" 3/16" X 3/32" 1/4-10
15/16" to 1-1/4" 1/4" X 1/8" 5/16-18
1-5/16" to 1-3/8" 5/16" X 5/32" 3/8-16
1-7/16" X 1-3/4" 3/8" X 3/16" 3/8-16
1-13/16" X 2-1/4" 1/2" X 1/4" 1/2-13
2-5/16" X 2-3/4" 5/8" X 5/16" 1/2-13
2-13/16" X 3-1/4" 3/4" X 3/8" 5/8-11

*Some products may not carry these standards. Contact us to confirm any tolerances.

Bore Tolerance

Bore Size Tolerance
1" & Smaller + 0.001" / - 0.000"
1-1/16" to 2" + 0.002" / - 0.000"
2-1/16" to 3" + 0.003" / - 0.000"
3-1/16" & Larger + 0.004" / - 0.000"

Sprocket - Keyway Tolerances

Width Tolerance Height Tolerance
+ 0.002" / - 0.000" + 0.001" / - 0.000"