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Keyways Index

BS 46 Keys and keyway Dimensions-Parallel Rectangular

Ref Standard ..British Standard :BS 46 Part 1 : 1958 Keys and keyways and taper pins. Specification. Keys and keyways



BS 46 Part 1 : 1958 Keys and keyway Dimensions-Parallel Rectangular

all dimensions in inches


Shaft Diameter       Keyway (Shaft   Keyway (Hub) Radius r
D Width Height   W H   W h
Over To/Inc W T   Min Max Max Min   Min Max Min Max  
1 1 1/4 5/16 1/4   0.311 0.312 0.146 0.152   0.312 0.313 0.112 0.118 0.010
1 1/4 1 1/2 3/8 1/4   0.374 0.375 0.150 0.156   0.375 0.376 0.108 0.114 0.010
1 1/2 1 3/4 7/16 5/16   0.437 0.438 0.186 0.192   0.438 0.439 0.135 0.141 0.020
1 3/4 2 1/2 5/16   0.499 0.500 0.190 0.196   0.500 0.501 0.131 0.137 0.020
2 2 1/2 5/8 7/16   0.624 0.625 0.260 0.266   0.625 0.626 0.185 0.191 0.020
2 1/2 3 3/4 1/2   0.749 0.750 0.299 0.305   0.750 0.751 0.209 0.215 0.020
3 3 1/2 7/8 5/8   0.874 0.875 0.370 0.376   0.875 0.876 0.264 0.270 0.062
3 1/2 4 1 3/4   0.999 1.000 0.441 0.447   1.000 1.001 0.318 0.324 0.062
4 5 1 1/4 7/8   1.248 1.250 0.518 0.524   1.250 1.252 0.366 0.372 0.062
5 6 1 1/2 1   1.498 1.500 0.599 0.605   1.500 1.502 0.412 0.418 0.062
6 7 1 3/4 1 1/4   1.748 1.750 0.740 0.746   1.750 1.752 0.526 0.532 0.125
7 8 2 1 3/8   1.998 2.000 0.818 0.824   2.000 2.002 0.573 0.579 0.125
8 9 2 1/4 1 1/2   2.248 2.250 0.897 0.905   2.250 2.252 0.619 0.627 0.125
9 10 2 1/2 1 5/8   2.498 2.500 0.975 0.983   2.500 2.502 0.666 0.674 0.187
10 11 2 3/4 1 7/8   2.748 2.750 1.114 1.122   2.750 2.752 0.777 0.785 0.187
11 12 3 2   2.998 3.000 1.195 1.203   3.000 3.002 0.823 0.831 0.187
12 13 3 1/4 2 1/8   3.248 3.250 1.273 1.281   3.250 3.252 0.870 0.878 0.187
13 14 3 1/2 2 3/8   3.498 3.500 1.413 1.421   3.500 3.502 0.980 0.988 0.250
14 15 3 3/4 2 1/2   3.748 3.750 1.492 1.502   3.750 3.752 1.026 1.036 0.250
15 16 4 2 5/8   3.998 4.000 1.571 1.581   4.000 4.002 1.072 1.082 0.250
16 17 4 1/4 2 7/8   4.248 4.250 1.711 1.721   4.250 4.252 1.182 1.192 0.312
17 18 4 1/2 3   4.498 4.500 1.791 1.801   4.500 4.502 1.229 1.239 0.312
18 19 4 3/4 3 1/8   4.748 4.750 1.868 1.878   4.750 4.752 1.277 1.287 0.312
19 20 5 3 3/8   4.998 5.000 2.010 2.020   5.000 5.002 1.385 1.395 0.312


BS 46 Part 1 : 1958 Key Dimensions

all dimensions in inches

Width Height W T Pref. Length
W T Max Min Max Min From To
5/16 1/4 0.314 0.312 0.253 0.250 3/4 3
3/8 1/4 0.377 0.375 0.253 0.250 1 4
7/16 5/16 0.440 0.438 0.315 0.312 1 1/2 4
1/2 5/16 0.502 0.500 0.315 0.312 1 3/4 5
5/8 7/16 0.627 0.625 0.441 0.438 2 1/2 5
3/4 1/2 0.752 0.750 0.503 0.500 3 6
7/8 5/8 0.877 0.875 0.629 0.625 3 1/2 6
1 3/4 1.003 1.000 0.754 0.750    
1 1/4 7/8 1.253 1.250 0.879 0.875    
1 1/2 1 1.504 1.500 1.006 1.000    
1 3/4 1 1/4 1.754 1.750 1.256 1.250    
2 1 3/8 2.005 2.000 1.381 1.375    
2 1/4 1 1/2 2.255 2.250 1.506 1.500    
2 1/2 1 5/8 2.505 2.500 1.631 1.625    
2 3/4 1 7/8 2.755 2.750 1.881 1.875    
3 2 3.006 3.000 2.008 2.000    
3 1/4 2 1/8 3.256 3.250 2.133 2.125    
3 1/2 2 3/8 3.506 3.500 2.383 2.375    
3 3/4 2 1/2 3.756 3.750 2.508 2.500    
4 2 5/8 4.008 4.000 2.633 2.625    
4 1/4 2 7/8 4.258 4.250 2.883 2.875    
4 1/2 3 4.508 4.500 3.010 3.000    
4 3/4 3 1/8 4.758 4.750 3.135 3.125    
5 3 3/8 5.008 5.000 3.385 3.375    


Links Providing information on Keyways
  1. Mitcalc.com...Excel based programme allowing detailed design of shaft connection (19 Eur)
  2. Hercules -Keyways dimensions ...Download of keyway dimensions
  3. Specifying Rectangular Keyways ...MDmetric document - useful check information for my tables
  4. Transeals - Keyways ...Transeals - useful check information for my tables

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Last Updated 13/10/2007