Bore, Keyway & Setscrew Information

Standard Keyway & Setscrew Sizes

Bore Keyway Setscrew
3/8 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 - 20
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 to 1-3/4 3/8 x 3/16 3/8 - 16
1-13/16 to 2-1/4 1/2 x 1/4 1/2 - 13
2-5/16 to 2-3/4 5/8 x 5/16 1/2 - 13
2-13/16 to 3-1/4 3/4 x 3/8 5/8 - 11
3-5/16 to 3-3/4 7/8 x 7/16 5/8 - 11
3-13/16 to 4-1/2 1 x 1/2 3/4 - 10
4-9/16 to 5-1/2 1-1/4 x 5/8 3/4 - 10
5-9/16 to 6-1/2 1-1/2 x 3/4 3/4 - 10
6-9/16 to 7-1/2 1-3/4 x 3/4 7/8 - 9
7-9/16 to 9 2 x 3/4 7/8 - 9
9-1/16 to 11 2-1/2 x 7/8 7/8 - 9

Standard Bore Tolerances

Bore Tolerance
0 to 2 +.002, -.000
2 to 3 +.003, -.000
3 to 4 +.004, -.000
Over 4 +.005, -.000

Standard Setscrew Locations

If one setscrew is furnished the location will be 0°. If two setscrews are furnished the locations will be 0° and 90°, unless otherwise specified.

Standard Setscrew Locations

Standard Keyway Dimensions

Bore Width Depth
1/2 1/8 0.555
9/16 1/8 0.618
5/8 3/16 0.704
11/16 3/16 0.768
3/4 3/16 0.832
13/16 3/16 0.895
7/8 3/16 0.959
7/8 1/4 0.982
15/16 1/4 1.046
1 1/4 1.109
1-1/16 1/4 1.173
1-1/8 1/4 1.236
1-3/16 1/4 1.299
1-1/4 1/4 1.362
1-1/4 5/16 1.386
1-5/16 5/16 1.450
1-3/8 5/16 1.513
1-7/16 3/8 1.600
1-1/2 3/8 1.664
1-9/16 3/8 1.728
1-5/8 3/8 1.791
1-11/16 3/8 1.854
1-3/4 3/8 1.917
1-13/16 1/2 2.029
1-7/8 1/2 2.091
1-15/16 1/2 2.156
2 1/2 2.218
2-1/16 1/2 2.283
2-1/8 1/2 2.345
2-3/16 1/2 2.409
2-1/4 1/2 2.472
2-5/16 5/8 2.584
2-3/8 5/8 2.646
2-7/16 5/8 2.711
2-1/2 5/8 2.773
2-9/16 5/8 2.837
2-5/8 5/8 2.900
2-11/16 5/8 2.964
2-3/4 5/8 3.027
2-13/16 3/4 3.138
2-7/8 3/4 3.200
2-15/16 3/4 3.265
3 3/4 3.327
3-1/16 3/4 3.392
3-1/8 3/4 3.456
3-3/16 3/4 3.519
3-1/4 3/4 3.582
3-5/16 7/8 3.693
3-3/8 7/8 3.757
3-7/16 7/8 3.820
3-1/2 7/8 3.884
3-9/16 7/8 3.947
3-5/8 7/8 4.010
3-11/16 7/8 4.074
3-3/4 7/8 4.137
3-13/16 1 4.248
3-7/8 1 4.312
3-15/16 1 4.375
4 1 4.438
4-1/16 1 4.502
4-1/8 1 4.565
4-3/16 1 4.629
4-1/4 1 4.692
4-5/16 1 4.755
4-3/8 1 4.819
4-7/16 1 4.882
4-1/2 1 4.945
4-9/16 1-1/4 5.103
4-5/8 1-1/4 5.167
4-11/16 1-1/4 5.231
4-3/4 1-1/4 5.294
4-13/16 1-1/4 5.358
4-7/8 1-1/4 5.421
4-15/16 1-1/4 5.485
5 1-1/4 5.548
5-1/16 1-1/4 5.611
5-1/8 1-1/4 5.675
5-3/16 1-1/4 5.738
5-1/4 1-1/4 5.802
5-5/16 1-1/4 5.865
5-3/8 1-1/4 5.928
5-7/16 1-1/4 5.992
5-1/2 1-1/4 6.055
5-9/16 1-1/2 6.213
5-5/8 1-1/2 6.277
5-11/16 1-1/2 6.340
5-3/4 1-1/2 6.404
5-13/16 1-1/2 6.467
5-7/8 1-1/2 6.531
5-15/16 1-1/2 6.594
6 1-1/2 6.658
6-1/16 1-1/2 6.721
6-1/8 1-1/2 6.785
6-3/16 1-1/2 6.848
6-1/4 1-1/2 6.911
6-5/16 1-1/2 6.975
6-3/8 1-1/2 7.038
6-7/16 1-1/2 7.101
6-1/2 1-1/2 7.165
6-9/16 1-3/4 7.323
6-5/8 1-3/4 7.386
6-11/16 1-3/4 7.450
6-3/4 1-3/4 7.513
6-13/16 1-3/4 7.577
6-7/8 1-3/4 7.640
6-15/16 1-3/4 7.704
7 1-3/4 7.767
7-1/16 1-3/4 7.831
7-1/8 1-3/4 7.894
7-3/16 1-3/4 7.958
7-1/4 1-3/4 8.021
7-5/16 1-3/4 8.084
7-3/8 1-3/4 8.148
7-7/16 1-3/4 8.211
7-1/2 1-3/4 8.274
7-9/16 2 8.433
7-5/8 2 8.496
7-11/16 2 8.560
7-3/4 2 8.623
7-13/16 2 8.687
7-7/8 2 8.750
7-15/16 2 8.813
8 2 8.877
8-1/16 2 8.940
8-1/8 2 9.004
8-3/16 2 9.067
8-1/4 2 9.131
8-5/16 2 9.194
8-3/8 2 9.257
8-7/16 2 9.321
8-1/2 2 9.384

Key Depth Tolerance is +.010/-/000 for all standard keyways.

Bore Size Identification System

Bore Size Identification System

Bore Size Chart

08 = 1/2" 23 = 1-7/16" 38 = 2-3/8"
10 = 5/8" 24 = 1-1/2" 39 = 2-7/16"
12 = 3/4" 26 = 1-5/8" 42 = 2-5/8"
14 = 7/8" 28 = 1-3/4" 43 = 2-11/16"
15 = 15/16" 30 = 1-7/8" 46 = 2-7/8"
16 = 1" 31 = 1-15/16" 47 = 2-15/16"
18 = 1-1/8" 32 = 2" 50 = 3-1/8"
19 = 1-3/16" 34 = 2-1/8" 54 = 3-3/8"
20 = 1-1/4" 35 = 2-3/16" 55 = 3-7/16"
22 = 1-3/8" 36 = 2-1/4"  

Manufactured in the USA by G&G Manufacturing Company.