BS Plain Rectangular Parallel Keys, Keyways and Bars - Part 2 of Table 2 |
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| Size | Finished Key Bar | Tolerances | Standard Lengths | |||||||
| Min Width | Min Thickness | On Key | On Keyway | On Key Bar | Min | Increasing By | Max | |||
| Width & Thickness -0.0000 | Width +0.0000 | Depth -0.0000 | Width & Thickness -0.0000 |
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| 3/32" | 0.0978" | 0.0978" | +0.0010" | -0.0010" | +0.0010" | +0,0020" | 3/8" | 1/8" | 3/4" | |
| 1/8" | 0.1290" | 0.1290" | +0.0010" | -0.0010" | +0.0010" | +0.0020" | 1/2" | 1/8" | 1" | |
| 5/32" | 0.1603" | 0.1603" | +0.0010" | -0.0010" | +0.0010" | +0.0020" | 5/8" | 1/8" | 1-1/4" | |
| 3/16" | 0.1915" | 0.1603" | +0.0010" | -0.0010" | +0.0010" | +0.0020" | 3/4" | 1/4" | 1-1/2" | |
| 1/4" | 0.2540" | 0.1915" | +0.0010" | -0.0010" | +0.0010" | +0.0020" | 1" | 1/4" | 2" | |
| 5/16" | 0.3165" | 0.2228" | +0.0010" | -0.0010" | +0.0010" | +0.0020" | 1-1/4" | 1/4" | 2-1/2" | |
| 3/8" | 0.3790" | 0.2540" | +0.0010" | -0.0010" | +0.0010" | +0.0020" | 1-1/2" | 1/4" | 3" | |
| 7/16" | 0.4425" | 0.2863" | +0.0015" | -0.0015" | +0.0010" | +0.0020" | 1-3/4" | 1/4" | 3-1/2" | |
| 1/2" | 0.5050" | 0.3488" | +0.0015" | -0.0015" | +0.0010" | +0.0020" | 2" | 1/2" | 4" | |
| 9/16" | 0.5675" | 0.3800" | +0.0015" | -0.0015" | +0.0010" | +0.0020" | 2-1/2" | 1/2" | 5" | |
| 5/8" | 0.6300" | 0.4113" | +0.0015" | -0.0015" | +0.0010" | +0.0020" | 2-1/2" | 1/2" | 5" | |
| 11/16" | 0.6945" | 0.4758" | +0.0020" | -0.0020" | +0.0015" | +0.0030" | 3" | 1/2" | 6" | |
| 3/4" | 0.7570" | 0.5070" | +0.0020" | -0.0020" | +0.0015" | +0.0030" | 3" | 1/2" | 6" | |
| 7/8" | 0.8820" | 0.6320" | +0.0020" | -0.0020" | +0.0015" | +0.0030" | 3-1/2" | 1/2" | 7" | |
| 1" | 1.0070" | 0.6945" | +0.0020" | -0.0020" | +0.0015" | +0.0030" | 4" | 1" | 8" | |
| 1-1/8" | 1.1320" | 0.7570" | +0.0020" | -0.0020" | +0.0015" | +0.0030" | 5" | 1" | 10" | |
| 1-1/4" | 1.2570" | 0.8195" | +0.0020" | -0.0020" | +0.0015" | +0.0030" | 5" | 1" | 10" | |
| 1-3/8" | 1.3830" | 0.9455" | +0.0025" | -0.0025" | +0.0015" | +0.0040" | 6" | 1" | 12" | |
| 1-1/2" | 1.5080" | 1.0080" | +0.0025" | -0.0025" | +0.0015" | +0.0040" | 6" | 1" | 12" | |
| 1-5/8" | 1.6330" | 1.0705" | +0.0025" | -0.0025" | +0.0015" | +0.0040" | 7" | 1" | 14" | |
| 1-3/4" | 1.7580" | 1.1955" | +0.0025" | -0.0025" | +0.0015" | +0.0040" | 7" | 1" | 14" | |
| 1-7/8" | 1.850" | 1.2600" | +0.0030" | -0.0030" | +0.0020" | +0.0040" | 8" | 1! | 16" | |
| 2" | 2.0100" | 1.3850" | +0.0030" | -0.0030" | +0.0020" | +0.0040" | 8" | 2" | 16" | |
| 2-1/4" | 2.260" | 1.510" | +0.0030" | -0.0030" | +0.0020" | +0.0040" | 10" | 2" | 20" | |
| 2-1/2" | 2.510" | 1.635" | +0.0030" | -0.0030" | +0.0020" | +0.0040" | 10" | 2" | 20" | |
| 2-3/4" | 2.762" | 1.8870" | +0.0040" | -0.0040" | +0.0020" | +0.0050" | 12" | 2" | 24" | |
| 3" | 3.0120" | 2.0120" | +0.0040" | -0.0040" | +0.0020 | +0.0050" | 12" | 2" | 24 | |