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Screw Thread Conversion Table

Screw Thread Conversion Table

MAJOR DIAMETER (Converted to INCH Decimals)

NOMINAL DIAMETER (mm)	MAJOR DIAMETER
NOMINAL DIAMETER (mm)	mm	INCH
M 1	1	.0393
M 1.1	1.1	.0433
M 1.2	1.2	.0472
M 1.4	1.4	.0551
M 1.6	1.6	.0629
M 1.8	1.8	.0708
M 2	2	.0787
M 2.2	2.2	.0866
M 2.3	2.3	.0905
M 2.5	2.5	.0984
M 2.6	2.6	.1023
M 3	3	.1181
M 3.5	3.5	.1378
M 4	4	.1574
M 4.5	4.5	.1771
M 5	5	.1968
M 6	6	.2362
M 7	7	.2755
M 8	8	.3149
M 10	10	.3937
M 12	12	.4724
M 14	14	.5511
M 16	16	.6299
M 18	18	.7086
M 20	20	.7874
M 22	22	.8661
M 24	24	.9448
M 27	27	1.0629
M 30	30	1.181
M 33	33	1.299
M 36	36	1.417
M 39	39	1.535
M 42	42	1.654
M 45	45	1.772
M 48	48	1.890
M 52	52	2.047
M 56	56	2.205
M 60	60	2.362
M 64	64	2.520
M 68	68	2.677
M 72	72	2.835
M 76	76	2.992
M 80	80	3.150
M 85	85	3.346
M 90	90	3.543
M 95	95	3.740
M 100	100	3.937
M 105	105	4.134
M 110	110	4.331
M 115	115	4.538
M 120	120	4.724
M 125	125	4.921
M 130	130	5.118
M 135	135	5.315
M 140	140	5.512
M 145	145	5.709
M 150	150	5.906

THREAD PITCH (Converted to Number of Threads per Inch)

PITCH (mm)	Approx. Threads per Inch
0.08	317.5
0.09	282.25
0.1	254
0.125	203.25
0.15	169.25
0.175	145.25
0.2	127
0.225	113
0.25	101.5
0.3	84.75
0.35	72.5
0.4	63.5
0.45	56.5
0.5	50.75
0.6	42.25
0.7	36.25
0.75	33.75
0.8	31.75
0.9	25.25
1	25.5
1.25	20.25
1.5	17
1.75	14.25
2	12.75
2.5	10.25
3	8.5
3.5	7.25
4	6.25
5	5
5.5	4.5
6	4.25

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