BS Plain Rectangular Parallel Keys (Taper 1 in 100) Keyways and Bars - Part 1 of Table 2 |
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| Size | Shaft Diameters | Key | Depth of Immersion of key on Centreline (Nom) | Keyway | |||||
| Over | Up to & Including | Nominal & Minimum Width 'W' | Nominal & Minimum Thickness 'T' | In Shaft | In Hub | Max Width in Shaft & Hub | Min Depth on Centreline |
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| In Shaft | In Hub | ||||||||
| 3/32" | 3/16" | 1/4" | 3/32" | 3/32" | 0.0574" | 0.0364" | 0.0938" | 0.0584" | 0.0374" |
| 1/8" | 1/4" | 3/8" | 1/8" | 1/8" | 0.0756" | 0.0494" | 0.1250" | 0.0766" | 0.0504" |
| 5/32" | 3/8" | 1/2" | 5/32" | 5/32" | 0.0925" | 0.0638" | 0.1563" | 0.0935" | 0.0648" |
| 3/16" | 1/2" | 3/4" | 3/16" | 5/32" | 0.0925" | 0.0638" | 0.1875" | 0.0935" | 0.0648" |
| 1/4" | 3/4" | 1" | 1/4" | 3/16" | 0.1120" | 0.0755" | 0.250" | 0.1130" | 0.0765" |
| 5/16" | 1" | 1-1/4" | 5/16" | 7/32" | 0.1315" | 0.0873" | 0.3125" | 0.1325" | 0.0883" |
| 3/8" | 1-1/4" | 1-1/2" | 3/8" | 1/4" | 0.1511" | 0.0989" | 0.3750" | 0.1521" | 0.0999" |
| 7/16" | 1-1/2" | 1-3/4" | 7/16" | 9/32" | 0.1706" | 0.1107" | 0.4375" | 0.1721" | 0.1122" |
| 1/2" | 1-3/4" | 2" | 1/2" | 11/32" | 0.2058" | 0.1380" | 0.5000" | 0.2073" | 0.1395" |
| 9/16" | 2" | 2-1/4" | 9/16" | 1/2" | 0.2254" | 0.1496" | 0.5625" | 0.2269" | 0.1511" |
| 5/8" | 2-1/4" | 2-1/2" | 5/8" | 13/32" | 0.2450" | 0.1613" | 0.6250" | 0.2465" | 0.1628" |
| 11/16" | 2-1/2" | 2-3/4" | 11/16" | 15/32" | 0.2802" | 0.1886" | 0.6875" | 0.2822" | 0.1906" |
| 3/4" | 2-3/4" | 3" | 3/4" | 1/2" | 0.2998" | 0.2002" | 0.7500" | 0.3018" | 0.2022" |
| 7/8" | 3" | 3-1/2" | 7/8" | 5/8" | 0.3726" | 0.2524" | 0.8750" | 0.3746" | 0.2544" |
| 1" | 3-1/2" | 4" | 1" | 11/16" | 0.4117" | 0.2758" | 1" | 0.4137" | 0.2778" |
| 1-1/8" | 4" | 4-1/2" | 1-1/8" | 3/4" | 0.4508" | 0.2992" | 1.1250" | 0.4528" | 0.3012" |
| 1-1/4" | 4-1/2" | 5" | 1-1/4" | 13/16" | 0.4900" | 0.3225 | 1.2500" | 0.4920" | 0.3245" |
| 1-3/8" | 5" | 5-1/2" | 1-3/8" | 15/16" | 0.5604" | 0.3771" | 1.3750" | 0.5629" | 0.3796" |
| 1-1/2" | 5-1/2" | 6" | 1-1/2" | 1" | 0.5996" | 0.4004" | 1.5000" | 0.6021" | 0.4029" |
| 1-5/8" | 6" | 6-1/2" | 1-5/8" | 1-1/16" | 0.6388" | 0.4237" | 1.6250" | 0.6413" | 0.4262" |
| 1-3/4" | 6-1/2" | 7" | 1-3/4" | 1-3/16" | 0.7092" | 0.4783" | 1.750" | 0.7117" | 0.4808" |
| 1-7/8" | 7" | 7-1/2" | 1-7/8" | 1-1/4" | 0.7483" | 0.5017" | 1.8750" | 0.7513" | 0.5047" |
| 2" | 7-1/2" | 8" | 2" | 1-3/8" | 0.8187" | 0.5563" | 2" | 0.8217" | 0.5593" |
| 2-1/4" | 8" | 9" | 2-1/4" | 1-1/2" | 0.9016" | 0.5894" | 2.250" | 0.9046" | 0.6014" |
| 2-1/2" | 9" | 10" | 2-1/2" | 1-5/8" | 0.9799" | 0.6451" | 2.5000" | 0.9829" | 0.6481" |
| 2-3/4" | 10" | 11" | 2-3/4" | 1-7/8" | 1.1208" | 0.7542" | 2.750" | 1.1248" | 0.7582" |
| 3" | 11" | 12" | 3" | 2" | 1.1991" | 0.8009" | 3.000" | 1.2031" | 0.8049" |