Lister 5/1 Diesel

Threading Tables

Chart No 12 - Copper Tube Threads


Copper Tube Screw Threads (Whitworth Form 55 Deg Thread Angle)
Dimensions in Inches except where stated

Thread Form Data Tapping Hole
I/Diameter Gauge O/D Core Pitch Depth Radius Effective Dia T.P.I Dec / Met / Frac
1/8" Inside 0.248 0.202 0.0357 0.0230 -- 0.2250 28 Number 4
1/4" Inside 0.389 0.325 0.0500 0.0320 -- 0.3570 20 Letter Q
3/8" Inside 0.514 0.450 0.0500 0.0320 -- 0.4820 20 15/32"
1/2" Inside 0.639 0.575 0.0500 0.0320 -- 0.6070 20 15mm
5/8" Inside 0.764 0.700 0.0500 0.0320 -- 0.7320 20 23/32"
3/4" Inside 0.889 0.825 0.0500 0.0320 -- 0.8570 20 27/32"
7/8" Inside 1.104 0.950 0.0500 0.0320 -- 1.0720 20 24.50mm
1" Inside 1.155 1.091 0.0500 0.0320 -- 1.1230 20 26mm
1-1/4" Inside 1.405 1.341 0.0500 0.0320 -- 1.3730 20 34.50mm
1-1/2" Inside 1.655 1.591 0.0500 0.0320 -- 1.6230 20 1-39/64"
1-3/4" Inside 1.929 1.849 0.0625 0.0400 -- 1.8890 16 1-55/64"
2" Inside 2.179 2.099 0.0625 0.0400 -- 2.139 16 2.125"
2-1/4" Inside 2.429 2.349 0.0625 0.0400 -- 2.389 16 2-23/64"
2-1/2" Inside 2.679 2.599 0.0625 0.0400 -- 2.639 16 2-5/8"
2-3/4" Inside 2.929 2.849 0.0625 0.0400 -- 2.8890 16 2-55/64"
3" Inside 3.203 3.123 0.0625 0.0400 -- 3.1630 16 3"


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