Threading Tables

Chart No 12 - Copper Tube Threads

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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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