BSW thread ring gauge british standard whitworth thread

Part No: RG-310
Standard: BS84.1956
The British standard coarse screw thread is known as a parallel screw thread of Whitworth form having a 55 degree included angle. With the standardization of Unified threads, the BSW Whitworth thread form is typically being utilized for replacement parts. Steel bolts of ¾ inch and below should not be made to close class limits and instead should be specified to medium class.

Description

BSW thread ring gauge british standard whitworth thread

Specification:

Major diameter		Thread pitch		Minor diameter		75% tap drill size
(in)	(mm)	(in⁻¹)	(mm)	(in)	(mm)	(in)	(mm)
¹⁄₁₆	1.588	60	0.423	0.0412	1.046	#56	1.2
³⁄₃₂	2.381	48	0.529	0.0671	1.704	#49	1.9
¹⁄₈	3.175	40	0.635	0.0930	2.362	#39	2.6
⁵⁄₃₂	3.969	32	0.794	0.1162	2.951	#30	3.2
³⁄₁₆	4.763	24	1.058	0.1341	3.406	#26	3.7
⁷⁄₃₂	5.556	24	1.058	0.1654	4.201	#16	4.5
¹⁄₄	6.350	20	1.270	0.1860	4.724	#9	5.1
⁵⁄₁₆	7.938	18	1.411	0.2414	6.132	F	6.6
³⁄₈	9.525	16	1.588	0.2950	7.493	⁵⁄₁₆	8.0
⁷⁄₁₆	11.113	14	1.814	0.3460	8.788	U	9.4
¹⁄₂	12.700	12	2.117	0.3933	9.990	²⁷⁄₆₄	10.7
⁹⁄₁₆	14.288	12	2.117	0.4558	11.577	³¹⁄₆₄	12.3
⁵⁄₈	15.875	11	2.309	0.5086	12.918	¹⁷⁄₃₂	13.7
¹¹⁄₁₆	17.463	11	2.309	0.5711	14.506	¹⁹⁄₃₂	15.2
³⁄₄	19.050	10	2.540	0.6219	15.796	²¹⁄₃₂	16.6
¹³⁄₁₆	20.638	10	2.540	0.6844	17.384	²³⁄₃₂	18.2
⁷⁄₈	22.225	9	2.822	0.7327	18.611	⁴⁹⁄₆₄	19.5
¹⁵⁄₁₆	23.813	9	2.822	0.7952	20.198	⁵³⁄₆₄	21.1
1	25.400	8	3.175	0.8399	21.333	⁷⁄₈	22.3
1 ¹⁄₈	28.575	7	3.629	0.9420	23.927	⁶³⁄₆₄	25.1
1 ¹⁄₄	31.750	7	3.629	1.0670	27.102	1 ⁷⁄₆₄	28.3
1 ³⁄₈	34.925	6	4.233	1.1616	29.505	1 ⁷⁄₃₂	30.9
1 ¹⁄₂	38.100	6	4.233	1.2866	32.680	1 ⁵⁄₁₆	34.0
1 ⁵⁄₈	41.275	5	5.080	1.3689	34.770	1 ⁷⁄₁₆	36.4
1 ³⁄₄	44.450	5	5.080	1.4939	37.945	1 ⁹⁄₁₆	39.6
1 ⁷⁄₈	47.625	4 ¹⁄₂	5.644	1.5904	40.396	1 ⁵⁄₈	42.2
2	50.800	4 ¹⁄₂	5.644	1.7154	43.571	1 ³⁄₄	45.4
2 ¹⁄₈	53.975	4 ¹⁄₂	5.644	1.8404	46.746	1 ⁷⁄₈	48.6
2 ¹⁄₄	57.150	4	6.350	1.9298	49.017	2	51.1
2 ³⁄₈	60.325	4	6.350	2.0548	52.192	2 ¹⁄₈	54.2
2 ¹⁄₂	63.500	4	6.350	2.1798	55.367	2 ¹⁄₄	57.4
2 ⁵⁄₈	66.675	4	6.350	2.3048	58.542	2 ³⁄₈	60.6
2 ³⁄₄	69.850	3 ¹⁄₂	7.257	2.3841	60.556	2 ¹⁄₂	62.9
2 ⁷⁄₈	73.025	3 ¹⁄₂	7.257	2.5091	63.731	2 ⁵⁄₈	66.1
3	76.200	3 ¹⁄₂	7.257	2.6341	66.906	2 ³⁄₄	69.2
3 ¹⁄₄	82.550	3 ¹⁄₄	7.815	2.8560	72.542	3	75.0
3 ¹⁄₂	88.900	3 ¹⁄₄	7.815	3.1060	78.892	3 ¹⁄₄	81.4
3 ³⁄₄	95.250	3	8.467	3.3231	84.407	3 ³⁄₈	87.1
4	101.600	3	8.467	3.5731	90.757	3 ⁵⁄₈	93.5
4 ¹⁄₄	107.950	2 ⁷⁄₈	8.835	3.8046	96.637	3 ⁷⁄₈	99.5
4 ¹⁄₂	114.300	2 ⁷⁄₈	8.835	4.0546	102.987	4 ¹⁄₈	105.8
4 ³⁄₄	120.650	2 ³⁄₄	9.236	4.2843	108.821	4 ³⁄₈	111.8
5	127.000	2 ³⁄₄	9.236	4.5343	115.171	4 ⁵⁄₈	118.1
5 ¹⁄₄	133.350	2 ⁵⁄₈	9.676	4.7621	120.957	4 ⁷⁄₈	124.1
5 ¹⁄₂	139.700	2 ⁵⁄₈	9.676	5.0121	127.307	5 ¹⁄₈	130.4
5 ³⁄₄	146.050	2 ¹⁄₂	10.160	5.2377	133.038	5 ³⁄₈	136.3
6	152.400	2 ¹⁄₂	10.160	5.4877	139.388	5 ⁵⁄₈	142.6

bsw thread ring gauge

Shipping & Delivery

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