Technical Information

THREAD DATA CHARTS

BRITISH THREAD -- COARSE PITCH -- BSW

Whitworth Coarse Thread BS 84
BSW (British Standard Whitworth)
British Standard Whitworth Coarse Thread Series (parallel, cylindrical)
In GB most common Thread. Corresponds to the Metric Thread in its type of use.

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THREAD DATA CHART:
British Thread (British Standard Whitworth) -- Coarse Pitch
Nominal Size Ww	Thread Form Type	Major Diameter mm d=D	Pitch mm p	Threads per inch tpi	Pitch Diameter mm d2=D2	Minor Diameter Male Thd. d3	Thread Height H1	Tap Drill Diameter mm

1/16"	BSW	1.587	0.423	60	1.315	1.050	0.270	1.15
3/32"	BSW	2.381	0.529	48	2.041	1.703	0.338	1.90
1/8"	BSW	3.175	0.635	40	2.768	2.362	0.406	2.50
5/32"	BSW	3.969	0.793	32	3.459	2.952	0.507	3.20
3/16"	BSW	4.762	1.058	24	4.084	3.407	0.677	3.70
7/32"	BSW	5.556	1.058	24	4.878	4.201	0.677	4.50
1/4"	BSW	6.350	1.270	20	5.537	4.724	0.813	5.10
5/16"	BSW	7.938	1.411	18	7.034	6.131	0.904	6.50
3/8"	BSW	9.525	1.588	16	8.509	7.492	1.017	7.90
7/16"	BSW	11.113	1.814	14	9.951	8.789	1.162	9.20
1/2"	BSW	12.700	2.117	12	11.345	9.990	1.355	10.40
5/8"	BSW	15.876	2.309	11	14.397	12.918	1.479	13.40
3/4"	BSW	19.051	2.540	10	17.424	15.798	1.627	16.25
7/8"	BSW	22.226	2.822	9	20.419	18.611	1.807	19.25
1"	BSW	25.400	3.175	8	23.368	21.335	2.033	22.00
1-1/8"	BSW	28.576	3.629	7	26.253	23.929	2.324	24.50
1-1/4"	BSW	31.751	3.629	7	29.428	27.104	2.324	27.25
1-3/8"	BSW	34.926	4.233	6	32.215	29.505	2.711	30.25
1-1/2"	BSW	38.100	4.233	6	35.391	32.680	2.711	33.50
1-5/8"	BSW	41.277	5.080	5	38.024	34.771	3.253	35.50
1-3/4"	BSW	44.452	5.080	5	41.199	37.946	3.253	38.50
1-7/8"	BSW	47.627	5.645	4 1/2	44.012	40.398	3.614	41.25
2"	BSW	50.802	5.645	4 1/2	47.187	43.573	3.614	44.50
2-1/4"	BSW	57.152	6.350	4	53.086	49.020	4.066	50.00
2-1/2"	BSW	63.502	6.350	4	59.436	55.370	4.066	56.00
2-3/4"	BSW	69.853	7.257	3 1/2	65.205	60.558	4.647	61.50
3"	BSW	76.203	7.257	3 1/2	71.556	66.909	4.647	68.00
3-1/4"	BSW	82.553	7.816	3 1/4	77.548	72.544	5.005	73.75
3-1/2"	BSW	88.903	7.816	3 1/4	83.899	78.894	5.005	80.00
3-3/4"	BSW	95.254	8.467	3	89.832	84.410	5.422	85.50
4"	BSW	101.604	8.467	3	96.182	90.760	5.422	92.00
4-1/4"	BSW	107.954	8.835	2 7/8	102.297	96.639	5.657	98.00
4-1/2"	BSW	114.304	8.835	2 7/8	108.647	102.990	5.657	104.20
4-3/4"	BSW	120.665	9.237	2 3/4	114.740	108.625	5.915	110.00
5"	BSW	127.005	9.237	2 3/4	121.090	115.176	5.915	116.50
5-1/4"	BSW	133.355	9.677	2 5/8	127.159	120.963	6.196	122.50
5-1/2"	BSW	139.705	9.677	2 5/8	133.509	127.313	6.196	128.50
5-3/4"	BSW	146.055	10.160	2 1/2	139.549	133.043	6.506	134.50
6"	BSW	152.406	10.160	2 1/2	145.900	139.394	6.506	141.00

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Gage Crib Worldwide, Inc.
6701 Old 28th St SE, Suite B
Grand Rapids, MI 49546-6937
Phone: 001-616-954-6581 • Fax: 001-616-954-6583
Email: gageguy@gagecrib.com