Standard Keyway & Set Screws Size By Bore Size

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 standard dimensions.  Verify the dimension listed on the product detail page or contact us to confirm before ordering.

Standard Bore Tolerances

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"

Keyway Tolerances (Any Size Keyway)

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

Fraction to Decimal Conversion

Fraction
Decimal
1/4
0.250
5/16
0.3125
3/8
0.375
7/16
0.4375
1/2
0.500
9/16
0.5625
5/8
0.625
11/160.6875
3/40.750
13/16
0.8125
7/80.875
15/160.9375
11.000
1-1/16
1.0625
1-1/81.125
1-3/161.1875
1-1/41.250
1-5/161.3125
1-3/81.375
1-7/161.4375
1-1/21.500
1-9/161.5625
1-5/81.625
1-11/161.6875
1-3/41.750
1-13/161.8125
1-7/81.875
1-15/161.9375
22.00
2-1/162.0625
2-1/82.125
2-1/42.250
2-5/162.3125
2-3/82.375
2-7/162.4375
2-1/22.500
2-9/162.5625
2-5/82.625
2-11/162.6875
2-3/42.750
2-13/162.8125
2-7/82.875
2-15/162.9375
33.000