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Shaft Key Seat Depth Control Values S and T for Shaft and Hub ANSI B17.1

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Shaft Key Seat Depth Control Values S and T for Shaft and Hub ANSI B17.1

Keyseat Alignment Tolerances: A tolerance of 0.010 inch, max is provided for offset (due to parallel displacement of keyseat centerline from centerline of shaft or bore) of keyseats in shaft and bore. The following tolerances for maximum lead (due to angular displacement of keyseat centerline from centerline of shaft or bore and measured at right angles to the shaft or bore centerline) of keyseats in shaft and bore are specified: 0.002 inch for keyseat length up to and including 4 inches; 0.0005 inch per inch of length for keyseat lengths above 4 inches to and including 10 inches; and 0.005 inch for keyseat lengths above 10 inches.

haft Key Seat Depth Control Values S and T for Shaft and Hub ANSI B17.1

All Dimensions are given in inches

Shafts, Parallel
and Taper
Hubs, Parallel
Hubs, Taper
Nominal Shaft
Square
Rectangular
Square
Rectangular
Square
Rectangular
Diameter
S
S
T
T
T
T
1/2
0.430
0.445
0.560
0.544
0.535
0.519
9/16
0.493
0.509
0.623
0.607
0.598
0.582
5/8
0.517
0.548
0.709
0.678
0.684
0.653
11/16
0.581
0.612
0.773
0.742
0.748
0.717
3/4
0.644
0.676
0.837
0.806
0.812
0.781
13/16
0.708
0.739
0.900
0.869
0.875
0.844
7/8
0.771
0.802
0.964
0.932
0.939
0.907
15/16
0.796
0.827
1.051
1.019
1.026
0.994
1
0.859
0.890
1.114
1.083
1.089
1.058
1-1/16
0.923
0.954
1.178
1.146
1.153
1.121
1-1/8
0.986
1.017
1.241
1.210
1.216
1.185
1-3/16
1.049
1.080
1.304
1.273
1.279
1.248
1-1/4
1.112
1.144
1.367
1.336
1.342
1.311
1-5/16
1.137
1.169
1.455
1.424
1.430
1.399
1-3/8
1.201
1.232
1.518
1.487
1.493
1.462
1-7/16
1.225
1.288
1.605
1.543
1.580
1.518
1-1/2
1.289
1.351
1.669
1.606
1.644
1.581
1-9/16
1.352
1.415
1.732
1.670
1.707
1.645
1-5/8
1.416
1.478
1.796
1.733
1.771
1.708
11-1/16
1.479
1.541
1.859
1.796
1.834
1.771
1-3/4
1.542
1.605
1.922
1.860
1.897
1.835
11-3/16
1.527
1.590
2.032
1.970
2.007
1.945
1-7/8
1.591
1.654
2.096
2.034
2.071
2.009
11-5/16
1.655
1.717
2.160
2.097
2.135
2.072
2
1.718
1.781
2.223
2.161
2.198
2.136
2-1/16
1.782
1.844
2.287
2.224
2.262
2.199
2-1/8
1.845
1.908
2.350
2.288
2.325
2.263
2-3/16
1.909
1.971
2.414
2.351
2.389
2.326
2-1/4
1.972
2.034
2.477
2.414
2.452
2.389
2-5/16
1.957
2.051
2.587
2.493
2.562
2.468
2-3/8
2.021
2.114
2.651
2.557
2.626
2.532
2-7/16
2.084
2.178
2.714
2.621
2.689
2.596
2-1/2
2.148
2.242
2.778
2.684
2.753
2.659
2-9/16
2.211
2.305
2.841
2.748
2.816
2.723
2-5/8
2.275
2.369
2.905
2.811
2.880
2.786
21-1/16
2.338
2.432
2.968
2.874
2.943
2.849
2-3/4
2.402
2.495
3.032
2.938
3.007
2.913
2-13/16
2.387
2.512
3.142
3.017
3.117
2.992
2-7/8
2.450
2.575
3.205
3.080
3.180
3.055
2-15/16
2.514
2.639
3.269
3.144
3.244
3.119
3
2.577
2.702
3.332
3.207
3.307
3.182
3-1/16
2.641
2.766
3.396
3.271
3.371
3.246
3-1/8
2.704
2.829
3.459
3.334
3.434
3.309
3-3/16
2.768
2.893
3.523
3.398
3.498
3.373
3-1/4
2.831
2.956
3.586
3.461
3.561
3.436
3-5/16
2.816
2.941
3.696
3.571
3.671
3.546
3-3/8
2.880
3.005
3.760
3.635
3.735
3.610
3-7/16
2.943
3.068
3.823
3.698
3.798
3.673
3-1/2
3.007
3.132
3.887
3.762
3.862
3.737
3-9/16
3.070
3.195
3.950
3.825
3.925
3.800
3-5/8
3.134
3.259
4.014
3.889
3.989
3.864
3-11/16
3.197
3.322
4.077
3.952
4.052
3.927
3-3/4
3.261
3.386
4.141
4.016
4.116
3.991
3-13/16
3.246
3.371
4.251
4.126
4.226
4.101
3-7/8
3.309
3.434
4.314
4.189
4.289
4.164
3-15/16
3.373
3.498
4.378
4.253
4.353
4.228
4
3.436
3.561
4.441
4.316
4.416
4.291
4-3/16
3.627
3.752
4.632
4.507
4.607
4.482
4-1/4
3.690
3.815
4.695
4.570
4.670
4.545
4-3/8
3.817
3.942
4.822
4.697
4.797
4.672
4-7/16
3.880
4.005
4.885
4.760
4.860
4.735
4-1/2
3.944
4.069
4.949
4.824
4.924
4.799
4-3/4
4.041
4.229
5.296
5.109
5.271
5.084
4-7/8
4.169
4.356
5.424
5.236
5.399
5.211
4-15/16
4.232
4.422
5.487
5.300
5.462
5.275
5
4.296
4.483
5.551
5.363
5.526
5.338
5-3/16
4.486
4.674
5.741
5.554
5.716
5.529
5-1/4
4.550
4.737
5.805
5.617
5.780
5.592
5-7/16
4.740
4.927
5.995
5.807
5.970
5.782
5-1/2
4.803
4.991
6.058
5.871
6.033
5.846
5-3/4
4.900
5.150
6.405
6.155
6.380
6.130
5-15/16
5.091
5.341
6.596
6.346
6.571
6.321
6
5.155
5.405
6.660
6.410
6.635
6.385
6-1/4
5.409
5.659
6.914
6.664
6.889
6.639
6-1/2
5.662
5.912
7.167
6.917
7.142
6.892
6-3/4
5.760
a5.885
7.515
a7.390
7.490
a7.365
7
6.014
a6.139
7.769
a7.644
7.744
a7.619
7-1/4
6.268
a6.393
8.023
a7.898
7.998
a7.873
7-1/2
6.521
a6.646
8.276
a8.151
8.251
a8.126
7-3/4
6.619
6.869
8.624
8.374
8.599
8.349
8
6.873
7.123
8.878
8.628
8.853
8.603
9
7.887
8.137
9.892
9.642
9.867
9.617
10
8.591
8.966
11.096
10.721
11.071
10.696
11
9.606
9.981
12.111
11.736
12.086
11.711
12
10.309
10.809
13.314
12.814
13.289
12.789
13
11.325
11.825
14.330
13.830
14.305
13.805
14
12.028
12.528
15.533
15.033
15.508
15.008
15
13.043
13.543
16.548
16.048
16.523
16.023

a 1-3/4 × 1-1/2 inch key.

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