Lister 5/1 Diesel

Threading Tables

Chart No 4 - British Standard Pipe Threads


BSP Threads
Dimensions in Inches except where stated

Thread Form Data Tapping Drill Clearance Drill
Diameter O/Diameter Core Pitch Depth Radius Effective Dia T.P.I Dec / Met / Frac Dec / Met / Frac
1/8" 0.3830 0.3370 0.0357 0.0229 0.0049 0.3601 28 0.3445 - 8.75mm 0.3858 - 9.80mm
1/4" 0.5180 0.4510 0.0526 0.0335 0.0072 0.4845 19 0.4646 - 11.80mm 0.5312 - 17/32"
3/8" 0.6560 0.5890 0.0526 0.0335 0.0072 0.0225 19 0.6004 - 15.25mm 0.6719 - 43/64"
1/2" 0.8250 0.7340 0.0714 0.0457 0.0098 0.7793 14 0.7500 - 3/4" 0.8281 - 53/64"
5/8" 0.9020 0.8110 0.0714 0.0457 0.0098 0.8563 14 0.8281 - 53/64" 0.9062 - 29/32"
3/4" 1.0410 0.9500 0.0714 0.0457 0.0098 0.9953 14 0.9646 - 24.50mm 1.0469 - 1-3/64"
7/8" 1.1890 1.0980 0.0714 0.0457 0.0098 1.1433 14 1.1122 - 28.25mm 1.2031 - 1-13/64"
1" 1.3090 1.1930 0.0909 0.0582 0.0125 1.2508 11 1.2106 - 30.75mm 1.3125 - 1-5/16"
1-1/4" 1.6500 1.5340 0.0909 0.0582 0.0125 1.5918 11 1.5551 - 39.50mm 1.6562 - 1-21/32"
1-1/2" 1.8820 1.7660 0.0909 0.0582 0.0125 1.8238 11 1.7812 - 1-25/32" 1.8906 - 1-57/54"
1-3/4" 2.1160 2.0000 0.0909 0.0582 0.0125 2.0578 11 2.0079 - 51.00mm 2.1250 - 2-1/8"
2" 2.3470 2.2310 0.0909 0.0582 0.0125 2.2888 11 2.2500 - 2-1/4" 2.3594 - 2-23/64"


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