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Dimensions Of Pipe Threads

British Standard Threads

British Engineering Standard Association Reports No. 21 - 1938 Forms of British Standard Pipe Threads.

Dimension of Pipe

Table 1 Basic Sizes

Dimensions in inches

Nominal Bore of Pipe	Approximate Outside Diameter of Black Pipe	Number of Threads Per inch	Pitch	Depth of Thread	Diameter at Gauge Diameter from End (Gauge Dia)	Distance of Gauge Diameter from End (Gauge Length)	Length of Useful Thread
	A		P	h	B	F	E
1/8	0.400	28	0.03571	0.0229	0.383	0.1563	0.2545
1/4	0.538	19	0.05263	0.0337	0.518	0.2367	0.3814
3/8	0.676	19	0.05263	0.0337	0.656	0.2500	0.3947
1/2	0.847	14	0.07143	0.0457	0.825	0.3214	0.5178
3/4	1.063	14	0.07143	0.0457	1.041	0.3750	0.5714
1	1.336	11	0.09091	0.0582	0.309	0.4091	0.6591
1 1/4	1.677	11	0.09091	0.0582	1.650	0.5000	0.7500
1 1/2	1.909	11	0.09091	0.0582	1.882	0.5000	0.7500
2	2.381	11	0.09091	0.0582	2.347	0.6250	0.9204
2 1/2	2.996	11	0.09091	0.0582	2.690	0.6875	1.0511
3	3.499	11	0.09091	0.0582	3.460	0.8125	1.1761
3 1/2	3.991	11	0.09091	0.0582	3.950	0.8750	1.2386
4	4.494	11	0.09091	0.0582	4.450	1.0000	1.4091
5	5.493	11	0.09091	0.0582	5.450	1.1250	1.5795
6	6.501	11	0.09091	0.0582	6.450	1.1250	1.5795

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