Lister 5/1 Diesel

Threading Tables

Chart No 6 - 'Continental' Whitworth Threads


'Continental' Whitworth Form Threads (55 Deg Thread Angle)

Thread Form Data
Diameter O/Diameter Core Pitch Depth Radius Effective Dia T.P.I
1/4" 0.2425 0.1859 0.0500 0.0283 0.0069 0.2142 20
5/16" 0.3042 0.2413 0.0555 0.0314 0.0076 0.2769 18
3/8" 0.3657 0.2950 0.0625 0.0353 0.0086 0.3304 16
1/2" 0.4876 0.3932 0.0833 0.0472 0.0114 0.4404 12
5/8" 0.6115 0.5085 0.0909 0.0515 0.0125 0.5600 11
3/4" 0.7353 0.6218 0.1000 0.0567 0.0137 0.6786 10
7/8" 0.8586 0.7327 0.1111 0.0629 0.0153 0.7957 9
1" 0.9815 0.8400 0.1250 0.0708 0.0172 0.9107 8
1-1/8" 1.1039 0.9420 0.1429 0.0809 0.0196 1.0230 7
1-1/4" 1.2289 1.0670 0.1429 0.0809 0.0196 1.1480 7
1-3/8" 1.3504 1.1616 0.1666 0.0944 0.0229 1.2560 6
1-1/2" 1.4754 1.2866 0.1666 0.0944 0.0229 1.3810 6
1-5/8" 1.5955 1.3689 0.2000 0.1133 0.0275 1.4822 5
1-3/4" 1.7205 1.4939 0.2000 0.1133 0.0275 1.6072 5
2" 1.9671 1.7153 0.2222 0.1259 0.0305 1.8412
2-1/4" 2.2130 1.9299 0.2500 0.1415 0.0343 2.0715 4
2-1/2" 2.4630 2.1799 0.2500 0.1415 0.0343 2.3215 4
3" 2.9576 2.6341 0.2857 0.1618 0.0392 2.7958


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