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ISO Metric Screw Threads Specification

Normal diameter	Pitch	Inner threads					External threads
		min major diameter	Pitch dia.		Minor dia.		Major dia.		Pitch dia.		Minor dia.
			Pitch dia.		Minor dia.		Major dia.		Pitch dia.		Minor dia.
			min	max	min	max	min	max	min	max	min	max
1	0.25	1.0	0.838	0.883	0.729	0.774	0.958	1.000	0.804	0.838	0.649	0.693
1.1	0.25	1.1	0.938	0.983	0.829	0.874	1.058	1.100	0.904	0.938	0.749	0.793
1.2	0.25	1.2	1.038	1.083	0.929	0.974	1.158	1.200	1.004	1.038	0.849	0.893
1.4	0.3	1.4	1.205	1.253	1.075	1.128	1.352	1.400	1.169	1.205	0.984	1.032
1.6	0.35	1.6	1.373	1.426	1.221	1.284	1.547	1.600	1.333	1.373	1.117	1.170
1.8	0.35	1.8	1.573	1.626	1.421	1.484	1.747	1.800	1.533	1.573	1.317	1.370
2	0.4	2.0	1.740	1.811	1.567	1.657	1.940	2.000	1.698	1.740	1.451	1.509
2.2	0.45	2.2	1.908	1.983	1.713	1.813	2.137	2.200	1.863	1.908	1.586	1.648
2.5	0.45	2.5	2.208	2.283	2.013	2.113	2.437	2.500	2.163	2.208	1.886	1.948
3	0.5	3.0	2.675	2.755	2.459	2.571	2.933	3.000	2.627	2.675	2.320	2.387
3.5	0.6	3.5	3.110	3.200	2.850	2.975	3.420	3.500	3.057	3.110	2.688	2.764
4	0.7	4.0	3.545	3.640	3.242	3.382	3.910	4.000	3.489	3.545	3.058	3.141
4.5	0.75	4.5	4.013	4.108	3.688	3.838	4.410	4.500	3.957	4.013	3.495	3.580
5	0.8	5.0	4.480	4.580	4.134	4.294	4.905	5.000	4.420	4.480	3.928	4.019
6	1	6.0	5.350	5.468	4.917	5.107	5.888	6.000	5.279	5.350	4.663	4.773
7	1	7.0	6.350	6.468	5.917	6.107	6.888	7.000	6.279	6.350	5.663	5.773
8	1.25	8.0	7.188	7.313	6.647	6.859	7.868	8.000	7.113	7.188	6.343	6.466
9	1.25	9.0	8.188	8.313	7.647	7.859	8.868	9.000	8.113	8.188	7.343	7.466
10	1.5	10.0	9.026	9.166	8.376	8.612	9.850	10.000	8.941	9.026	8.017	8.160
11	1.5	11.0	10.026	10.166	9.376	9.612	10.850	11.000	9.941	10.026	9.017	9.160
12	1.75	12.0	10.863	11.023	10.106	10.371	11.830	12.000	10.768	10.863	9.691	9.853
14	2	14.0	12.701	12.871	11.835	12.135	13.820	14.000	12.601	12.701	11.369	11.546
16	2	16.0	14.701	14.871	13.835	14.135	15.820	16.000	14.601	14.701	13.369	13.546
18	2.5	18.0	16.376	16.556	15.294	15.649	17.788	18.000	16.270	16.376	14.731	14.933
20	2.5	20.0	18.376	18.556	17.294	17.649	19.788	20.000	18.270	18.376	16.731	16.933
22	2.5	22.0	20.376	20.556	19.294	19.649	21.788	22.000	20.270	20.376	18.731	18.933
24	3	24.0	22.051	22.263	20.752	21.152	23.764	24.000	21.926	22.051	20.078	20.319
27	3	27.0	25.051	25.263	23.752	24.152	26.764	27.000	24.926	25.051	23.078	23.319
30	3.5	30.0	27.727	27.951	26.211	26.661	29.735	30.000	27.959	27.727	25.439	25.706
33	3.5	33.0	30.727	30.951	29.211	29.661	32.735	33.000	30.595	30.727	28.439	28.706
36	4	36.0	33.402	33.638	31.670	32.145	35.700	36.000	33.262	33.402	30.799	31.093
39	4	39.0	36.402	36.638	34.670	35.145	38.700	39.000	36.262	36.402	33.799	34.093
42	4.5	42.0	39.077	39.327	37.129	37.659	41.685	42.000	38.972	39.077	36.156	36.479
45	4.5	45.0	42.077	42.327	40.129	40.659	44.685	45.000	41.927	42.077	39.156	39.479
48	5	48.0	44.752	45.017	42.587	43.147	47.665	48.000	44.592	44.752	41.513	41.866
52	5	52.0	48.752	48.017	46.587	47.147	51.665	52.000	48.592	48.752	45.513	45.866
56	5.5	56.0	52.428	52.708	50.046	50.646	55.645	56.000	52.258	52.428	48.870	49.252
60	5.5	60.0	56.428	56.708	54.046	54.646	59.645	60.000	56.258	56.428	52.870	53.252
64	6	64.0	60.103	60.403	57.505	58.135	63.625	64.000	59.923	60.103	56.228	56.639
68	6	68.0	64.103	64.403	61.505	62.135	67.625	68.000	63.923	64.103	60.228	60.639