BRITISH STANDARD WHITWORTH

55 °

SIZE	TPI	EXTERNAL		INTERNAL		DRILL SIZE		DRILL SIZE
BSW 55		MAJORS		MINORS		CLEARANCE HOLE		TAPPED HOLE
		INCH	MM	INCH	MM	INCH	MM	INCH	MM
1/16	60	0.0620	1.59	0.0410	1.05		1.99		1.15
3/32	48	0.0940	2.38	0.0670	1.70		2.67		1.90
1/8	40	0.1250	3.18	0.0930	2.36	9/64	3.57	# 38	2.60
5/32	32	0.1560	3.97	0.1160	2.95	11/64	4.37	1/8	3.20
3/16	24	0.1870	4.75	0.1340	3.40	13/64	5.16	# 27	3.70
7/32	24	0.2190	5.60	0.1660	4.22	15/64	5.95	# 19	4.30
1/4	20	0.2500	6.35	0.1860	4.72	17/64	6.75	# 9	5.00
5/16	18	0.3120	7.92	0.2410	6.12	21/64	8.33	1/4	6.40
3/8	16	0.3750	9.53	0.2950	7.49	25/64	9.92	5/16	8.00
7/16	14	0.4370	11.10	0.3460	8.79	29/64	11.51	U	9.40
1/2	12	0.5000	12.70	0.3930	9.98	17/32	13.49	27/64	10.80
9/16	12	0.5630	14.29	0.4560	11.58	19/32	15.08	15/32	12.00
5/8	11	0.6250	15.88	0.5090	12.93	21/32	16.67	17/32	13.50
11/16	11	0.6880	17.48	0.5710	14.50		17.75		15.00
3/4	10	0.7500	19.05	0.6220	15.80	25/32	19.84	21/32	17.00
13/16	10	0.8130	20.65	0.6840	17.37		21.00		18.00
7/8	9	0.8750	22.23	0.7330	18.62	29/32	23.02	49/64	19.50
15/16	9	0.9380	23.83	0.7950	20.19		24.00		20.75
1	8	1.0000	25.40	0.8400	21.34	1 1/16	26.99	7/8	22.50
1 1/8	7	1.1250	28.58	0.9420	23.93	1 3/16	30.16	1	25.50
1 1/4	7	1.2500	31.75	1.0670	27.10	1 5/16	33.34	1 7/16	28.50
1 3/8	6	1.3750	34.93	1.1620	29.51	1 7/16	36.51	1 7/32	31.00
1 1/2	6	1.5000	38.10	1.2870	32.69	1 9/16	39.69	1 11/32	34.50
1 5/8	5	1.6250	41.28	1.3690	34.77		41.50		35.50
1 3/4	5	1.7500	44.45	1.4940	37.95		45.00		38.50
1 7/8	4.5	1.8750	47.63	1.5910	40.40		48.00		41.25
2	4.5	2.0000	50.80	1.7150	43.57		51.00		44.50
2 1/4	4								50.00