Roymech engineering encyclopedia

Taper Square Metric Key and Keyway Dimensions



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BS 46 Rectangular Taper & Gib Head KeyWay & Key Dimensions




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



BS 46 Square Taper & Gib Head KeyWay & Key Dimensions

All Dimensions in inches


Shaft Diameter key   Keyway (Shaft   Keyway (Hub) Keyway
radius
r
D Width/ Height   W H   W h
Over To/Inc W & T   Min Max Min Max   Min Max Min Max
1/4 1/2 1/8   0.124 0.125 0.072 0.078   0.125 0.126 0.039 0.045 0.010
1/2 3/4 3/16   0.187 0.188 0.107 0.113   0.188 0.189 0.067 0.073 0.010
3/4 1 1/4   0.249 0.250 0.142 0.148   0.250 0.251 0.094 0.100 0.010
1 1 1/4 5/16   0.311 0.312 0.177 0.183   0.312 0.313 0.121 0.127 0.010
1 1/4 1 1/2 3/8   0.374 0.375 0.213 0.219   0.375 0.376 0.148 0.154 0.010
1 1/2 1 3/4 7/16   0.437 0.438 0.248 0.254   0.438 0.439 0.175 0.181 0.020
1 3/4 2 1/2   0.499 0.500 0.283 0.289   0.500 0.501 0.202 0.208 0.020
2 2 1/2 5/8   0.624 0.625 0.354 0.360   0.625 0.626 0.256 0.262 0.020
2 1/2 3 3/4   0.749 0.750 0.424 0.430   0.750 0.751 0.310 0.316 0.020
3 3 1/2 7/8   0.874 0.875 0.495 0.501   0.875 0.876 0.364 0.370 0.062
3 1/2 4 1   0.999 1.000 0.566 0.572   1.000 1.001 0.418 0.424 0.062
4 5 1 1/4   1.248 1.250 0.707 0.713   1.250 1.252 0.526 0.532 0.062
5 6 1 1/2   1.498 1.500 0.848 0.854   1.500 1.502 0.635 0.641 0.062


Key Dimensions


Key   Gib Head   Pref.Length L
Width
/Height		 W T   A B C D R  
W & T Max Min Max Min               Taper Gib Head
1/8 0.127 0.125 0.129 0.124   3/16 1/4 5/32 0.1 1/32   3/4 to 1  
3/16 0.190 0.188 0.192 0.187   1/4 3/8 7/32 0.2 1/33   3/4 to 2 1 1/2 to 2
1/4 0.252 0.250 0.254 0.249   5/16 7/16 9/32 0.2 1/16   3/4 to 3 1 1/2 to 4
5/16 0.314 0.312 0.316 0.311   3/8 9/16 11/32 0.3 1/16   3/4 to 3 2 to 4 1/2
3/8 0.377 0.375 0.379 0.374   7/16 5/8 13/32 0.3 1/16   1 to 4 2 to 6
7/16 0.440 0.438 0.442 0.437   1/2 3/4 15/32 0.4 1/16   1 3/4 to 4 2 1/2 & 3 to 6
1/2 0.502 0.500 0.504 0.499   9/16 7/8 17/32 0.4 1/16   2 to 6 2 1/2 & 3 to 6 1/2
5/8 0.627 0.625 0.630 0.624   11/16 1 21/32 0.5 1/8   2 1/2 & 3 to 6 4 1/2 to 7 & 8
3/4 0.752 0.750 0.755 0.749   13/16 1 1/4 23/32 0.5 1/8   3 1/2 to 6 4 &. 5 & 6 & 8
7/8 0.877 0.875 0.880 0.874   15/16 1 3/8 27/32 0.6 1/8   3 1/2 to 6 6 & 7 to 8
1 1.003 1.000 1.007 0.999   1 1/16 1 5/8 1 1/32 0.6 1/8      
1 1/4 1.253 1.250 1.257 1.249   1 5/16 2 1 9/32 0.7 1/4      
1 1/2 1.504 1.500 1.509 1.499   1 9/16 2 1/2 1 17/32 0.7 1/4