External Metric Thread Table Chart and Fastener Sizes M1.6 (2024)

External Metric Thread Table Chart and Fastener Sizes M1.6 - M18

ISO Hardware Engineering Data Fastener and Screw / Bolt Design, Formula and Calculations

The following table chart defines standard metric external thread size M1.6 to M18 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Do not use these values for standard metric internal thread design. All units in mm. These are the M Profile limiting Dimensionings.

Where:

H = P ( 3^1/2 / 2 ) = 0.866025 P or 0.125H = 0.108253P

ISO Metric Thread Designation	Pitch	External Threads
		Tolerance Class	Major Dia		Pitch Dia		Minor Dia
		Tolerance Class	Max	Min	Max	Min	Max	Min
M1.6 x 0.35	0.35	6g	1.581	1.496	1.354	1.291	1.202	1.075
M1.6 x 0.35	0.35	4g6g	1.581	1.496	1.354	1.314	1.202	1.098
M1.6 x 0.3	0.3	6g	1.582	1.507	1.387	1.342	1.257	1.157
M1.6 x 0.3	0.3	4g6g	1.582	1.507	1.387	1.359	1.257	1.174
M1.6 x 0.2	0.2	6g	1.583	1.527	1.453	1.403	1.366	1.280
M1.6 x 0.2	0.2	4g6g	1.583	1.527	1.453	1.421	1.366	1.298
M1.7 x 0.35	0.35	6g	1.681	1.596	1.454	1.391	1.302	1.175
M1.7 x 0.35	0.35	4g6g	1.681	1.596	1.454	1.414	1.302	1.198
M1.8 x 0.35	0.35	6g	1.781	1.696	1.554	1.491	1.402	1.275
M1.8 x 0.35	0.35	4g6g	1.781	1.696	1.554	1.514	1.402	1.298
M1.8 x 0.2	0.2	6g	1.783	1.727	1.653	1.603	1.566	1.480
M1.8 x 0.2	0.2	4g6g	1.783	1.727	1.653	1.621	1.566	1.498
M2 x 0.4	0.4	6g	1.981	1.886	1.721	1.654	1.548	1.408
M2 x 0.4	0.4	4g6g	1.981	1.886	1.721	1.679	1.548	1.433
M2 x 0.25	0.25	6g	1.982	1.915	1.820	1.764	1.711	1.610
M2 x 0.25	0.25	4g6g	1.982	1.915	1.820	1.784	1.711	1.630
M2.2 x 0.45	0.45	6g	2.180	2.080	1.888	1.817	1.693	1.540
M2.2 x 0.45	0.45	4g6g	2.180	2.080	1.888	1.843	1.693	1.566
M2.2 x 0.25	0.25	6g	2.182	2.115	2.020	1.964	1.911	1.810
M2.2 x 0.25	0.25	4g6g	2.182	2.115	2.020	1.984	1.911	1.830
M2.3 x 0.45	0.45	6g	2.280	2.180	1.988	1.917	1.793	1.640
M2.3 x 0.45	0.45	4g6g	2.280	2.180	1.988	1.943	1.793	1.666
M2.3 x 0.4	0.4	6g	2.281	2.186	2.021	1.954	1.848	1.708
M2.3 x 0.4	0.4	4g6g	2.281	2.186	2.021	1.979	1.848	1.733
M2.5 x 0.45	0.45	6g	2.480	2.380	2.188	2.117	1.993	1.840
M2.5 x 0.45	0.45	4g6g	2.480	2.380	2.188	2.143	1.993	1.866
M2.5 x 0.35	0.35	6g	2.481	2.396	2.254	2.191	2.102	1.975
M2.5 x 0.35	0.35	4g6g	2.481	2.396	2.254	2.214	2.102	1.998
M2.6 x 0.45	0.45	6g	2.580	2.480	2.288	2.217	2.093	1.940
M2.6 x 0.45	0.45	4g6g	2.580	2.480	2.288	2.243	2.093	1.966
M3 x 0.5	0.5	6g	2.980	2.874	2.655	2.580	2.439	2.272
M3 x 0.5	0.5	4g6g	2.980	2.874	2.655	2.607	2.439	2.299
M3 x 0.35	0.35	6g	2.981	2.896	2.754	2.687	2.602	2.471
M3 x 0.35	0.35	4g6g	2.981	2.896	2.754	2.712	2.602	2.496
M3.5 x 0.6	0.6	6g	3.479	3.354	3.089	3.004	2.829	2.635
M3.5 x 0.6	0.6	4g6g	3.479	3.354	3.089	3.036	2.829	2.667
M3.5 x 0.35	0.35	6g	3.481	3.396	3.254	3.187	3.102	2.971
M3.5 x 0.35	0.35	4g6g	3.481	3.396	3.254	3.212	3.102	2.996
M4 x 0.7	0.7	6g	3.978	3.838	3.523	3.433	3.220	3.002
M4 x 0.7	0.7	4g6g	3.978	3.838	3.523	3.467	3.220	3.036
M4 x 0.5	0.5	6g	3.980	3.874	3.655	3.580	3.439	3.272
M4 x 0.5	0.5	4g6g	3.980	3.874	3.655	3.607	3.439	3.299
M4.5 x 0.75	0.75	6g	4.478	4.338	3.991	3.901	3.666	3.439
M4.5 x 0.75	0.75	4g6g	4.478	4.338	3.991	3.935	3.666	3.473
M4.5 x 0.5	0.5	6g	4.480	4.374	4.155	4.080	3.939	3.772
M4.5 x 0.5	0.5	4g6g	4.480	4.374	4.155	4.107	3.939	3.799
M5 x 0.8	0.8	6g	4.976	4.826	4.456	4.361	4.110	3.869
M5 x 0.8	0.8	4g6g	4.976	4.826	4.456	4.396	4.110	3.904
M5 x 0.5	0.5	6g	4.980	4.874	4.655	4.580	4.439	4.272
M5 x 0.5	0.5	4g6g	4.980	4.874	4.655	4.607	4.439	4.299
M5.5 x 0.5	0.5	6g	5.480	5.374	5.155	5.065	4.939	4.757
M5.5 x 0.5	0.5	4g6g	5.480	5.374	5.155	5.099	4.939	4.791
M6 x 1	1	6g	5.974	5.794	5.324	5.212	4.891	4.596
M6 x 1	1	4g6g	5.974	5.794	5.324	5.253	4.891	4.637
M6 x 0.8	0.8	6g	5.976	5.826	5.456	5.376	5.110	4.884
M6 x 0.8	0.8	4g6g	5.976	5.826	5.456	5.406	5.110	4.914
M6 x 0.75	0.75	6g	5.978	5.838	5.491	5.391	5.166	4.929
M6 x 0.75	0.75	4g6g	5.978	5.838	5.491	5.428	5.166	4.966
M6 x 0.7	0.7	6g	5.978	5.838	5.523	5.428	5.220	4.997
M6 x 0.7	0.7	4g6g	5.978	5.838	5.523	5.463	5.220	5.032
M6 x 0.5	0.5	6g	5.980	5.874	5.655	5.570	5.439	5.262
M6 x 0.5	0.5	4g6g	5.980	5.874	5.655	5.602	5.439	5.294
M7 x 1	1	6g	6.974	6.794	6.324	6.212	5.891	5.596
M7 x 1	1	4g6g	6.974	6.794	6.324	6.253	5.891	5.637
M7 x 0.75	0.75	6g	6.978	6.838	6.491	6.391	6.166	5.929
M7 x 0.75	0.75	4g6g	6.978	6.838	6.491	6.428	6.166	5.966
M7 x 0.5	0.5	6g	6.980	6.874	6.655	6.570	6.439	6.262
M7 x 0.5	0.5	4g6g	6.980	6.874	6.655	6.602	6.439	6.294
M8 x 1.25	1.25	6g	7.972	7.760	7.160	7.042	6.619	6.272
M8 x 1.25	1.25	4g6g	7.972	7.760	7.160	7.085	6.619	6.315
M8 x 1	1	6g	7.974	7.794	7.324	7.212	6.891	6.596
M8 x 1	1	4g6g	7.974	7.794	7.324	7.253	6.891	6.637
M8 x 0.8	0.8	6g	7.976	7.826	7.456	7.350	7.110	6.858
M8 x 0.8	0.8	4g6g	7.976	7.826	7.456	7.389	7.110	6.897
M8 x 0.75	0.75	6g	7.978	7.838	7.491	7.391	7.166	6.929
M8 x 0.75	0.75	4g6g	7.978	7.838	7.491	7.428	7.166	6.966
M8 x 0.5	0.5	6g	7.980	7.874	7.655	7.570	7.439	7.262
M8 x 0.5	0.5	4g6g	7.980	7.874	7.655	7.602	7.439	7.294
M9 x 1.25	1.25	6g	8.972	8.760	8.160	8.042	7.619	7.272
M9 x 1.25	1.25	4g6g	8.972	8.760	8.160	8.085	7.619	7.315
M9 x 1	1	6g	8.974	8.794	8.324	8.212	7.891	7.596
M9 x 1	1	4g6g	8.974	8.794	8.324	8.253	7.891	7.637
M9 x 0.75	0.75	6g	8.978	8.838	8.491	8.391	8.166	7.929
M9 x 0.75	0.75	4g6g	8.978	8.838	8.491	8.428	8.166	7.966
M9 x 0.5	0.5	6g	8.980	8.874	8.655	8.570	8.439	8.262
M9 x 0.5	0.5	4g6g	8.980	8.874	8.655	8.602	8.439	8.294
M10 x 1.5	1.5	6g	9.968	9.732	8.994	8.862	8.344	7.938
M10 x 1.5	1.5	4g6g	9.968	9.732	8.994	8.909	8.344	7.985
M10 x 1.25	1.25	6g	9.972	9.760	9.160	9.042	8.619	8.272
M10 x 1.25	1.25	4g6g	9.972	9.760	9.160	9.085	8.619	8.315
M10 x 1.12	1.12	6g	9.973	9.783	9.246	9.128	8.761	8.438
M10 x 1.12	1.12	4g6g	9.973	9.783	9.246	9.171	8.761	8.481
M10 x 1	1	6g	9.974	9.794	9.324	9.212	8.891	8.596
M10 x 1	1	4g6g	9.974	9.794	9.324	9.253	8.891	8.637
M10 x 0.75	0.75	6g	9.978	9.838	9.491	9.391	9.166	8.929
M10 x 0.75	0.75	4g6g	9.978	9.838	9.491	9.428	9.166	8.966
M10 x 0.5	0.5	6g	9.980	9.874	9.655	9.570	9.439	9.262
M10 x 0.5	0.5	4g6g	9.980	9.874	9.655	9.602	9.439	9.294
M11 x 1.5	1.5	6g	10.968	10.732	9.994	9.862	9.344	8.938
M11 x 1.5	1.5	4g6g	10.968	10.732	9.994	9.911	9.344	8.987
M11 x 1	1	6g	10.974	10.794	10.324	10.212	9.891	9.596
M11 x 1	1	4g6g	10.974	10.794	10.324	10.253	9.891	9.637
M11 x 0.75	0.75	6g	10.978	10.838	10.491	10.391	10.166	9.929
M11 x 0.75	0.75	4g6g	10.978	10.838	10.491	10.428	10.166	9.966
M11 x 0.5	0.5	6g	10.980	10.874	10.655	10.570	10.439	10.262
M11 x 0.5	0.5	4g6g	10.980	10.874	10.655	10.602	10.439	10.294
M12 x 1.75	1.75	6g	11.966	11.701	10.829	10.679	10.072	9.601
M12 x 1.75	1.75	4g6g	11.966	11.701	10.829	10.734	10.072	9.656
M12 x 1.5	1.5	6g	11.968	11.732	10.994	10.854	10.344	9.930
M12 x 1.25	1.25	6g	11.972	11.760	11.160	11.028	10.619	10.258
M12 x 1.25	1.25	4g6g	11.972	11.760	11.160	11.075	10.619	10.305
M12 x 1	1	6g	11.974	11.794	11.324	11.206	10.891	10.590
M12 x 1	1	4g6g	11.974	11.794	11.324	11.249	10.891	10.633
M12 x 0.75	0.75	6g	11.978	11.838	11.491	11.385	11.166	10.923
M12 x 0.75	0.75	4g6g	11.978	11.838	11.491	11.424	11.166	10.962
M12 x 0.5	0.5	6g	11.980	11.874	11.655	11.565	11.439	11.257
M12 x 0.5	0.5	4g6g	11.980	11.874	11.655	11.598	11.439	11.290
M14 x 2	2	6g	13.962	13.682	12.663	12.503	11.797	11.271
M14 x 2	2	4g6g	13.962	13.682	12.663	12.563	11.797	11.331
M14 x 1.5	1.5	6g	13.968	13.732	12.994	12.854	12.344	11.930
M14 x 1.5	1.5	4g6g	13.968	13.732	12.994	12.904	12.344	11.980
M14 x 1.25	1.25	6g	13.972	13.760	13.160	13.028	12.619	12.258
M14 x 1.25	1.25	4g6g	13.972	13.760	13.160	13.075	12.619	12.305
M14 x 1	1	6g	13.974	13.794	13.324	13.206	12.891	12.590
M14 x 1	1	4g6g	13.974	13.794	13.324	13.250	12.891	12.634
M14 x 0.75	0.75	6g	13.978	13.838	13.491	13.385	13.166	12.923
M14 x 0.75	0.75	4g6g	13.978	13.838	13.491	13.424	13.166	12.962
M14 x 0.5	0.5	6g	13.980	13.874	13.655	13.565	13.439	13.257
M14 x 0.5	0.5	4g6g	13.980	13.874	13.655	13.598	13.439	13.290
M15 x 1.5	1.5	6g	14.968	14.732	13.994	13.854	13.344	12.930
M15 x 1.5	1.5	4g6g	14.968	14.732	13.994	13.904	13.344	12.980
M15 x 1	1	6g	14.974	14.794	14.324	14.206	13.891	13.590
M15 x 1	1	4g6g	14.974	14.794	14.324	14.249	13.891	13.633
M16 x 2	2	6g	15.962	15.682	14.663	14.503	13.797	13.271
M16 x 2	2	4g6g	15.962	15.682	14.663	14.563	13.797	13.331
M16 x 1.6	1.6	6g	15.968	15.756	14.929	14.824	14.236	13.838
M16 x 1.6	1.6	4g6g	15.968	15.756	14.929	14.863	14.236	13.877
M16 x 1.5	1.5	6g	15.968	15.732	14.994	14.854	14.344	13.930
M16 x 1.5	1.5	4g6g	15.968	15.732	14.994	14.904	14.344	13.980
M16 x 1.25	1.25	6g	15.972	15.760	15.160	15.028	14.619	14.258
M16 x 1.25	1.25	4g6g	15.972	15.760	15.160	15.075	14.619	14.305
M16 x 1	1	6g	15.974	15.794	15.324	15.206	14.891	14.590
M16 x 1	1	4g6g	15.974	15.794	15.324	15.249	14.891	14.633
M16 x 0.75	0.75	6g	15.978	15.838	15.491	15.385	15.166	14.923
M16 x 0.75	0.75	4g6g	15.978	15.838	15.491	15.424	15.166	14.962
M16 x 0.5	0.5	6g	15.980	15.874	15.655	15.565	15.439	15.257
M16 x 0.5	0.5	4g6g	15.980	15.874	15.655	15.599	15.439	15.291
M17 x 1.5	1.5	6g	16.968	16.732	15.994	15.854	15.344	14.930
M17 x 1.5	1.5	4g6g	16.968	16.732	15.994	15.904	15.344	14.980
M17 x 1	1	6g	16.974	16.794	16.324	16.206	15.891	15.590
M17 x 1	1	4g6g	16.974	16.794	16.324	16.249	15.891	15.633
M18 x 2.5	2.5	6g	17.958	17.623	16.334	16.164	15.252	14.624
M18 x 2.5	2.5	4g6g	17.958	17.623	16.334	16.228	15.252	14.688
M18 x 2	2	6g	17.962	17.682	16.663	16.503	15.797	15.271
M18 x 2	2	4g6g	17.962	17.682	16.663	16.563	15.797	15.331
M18 x 1.5	1.5	6g	17.968	17.732	16.994	16.854	16.344	15.930
M18 x 1.5	1.5	4g6g	17.968	17.732	16.994	16.904	16.344	15.980
M18 x 1.25	1.25	6g	17.972	17.760	17.160	17.028	16.619	16.258
M18 x 1.25	1.25	4g6g	17.972	17.760	17.160	17.075	16.619	16.305
M18 x 1	1	6g	17.974	17.794	17.324	17.206	16.891	16.590
M18 x 1	1	4g6g	17.974	17.794	17.324	17.249	16.891	16.633
M18 x 0.75	0.75	6g	17.978	17.838	17.491	17.385	17.166	16.923
M18 x 0.75	0.75	4g6g	17.978	17.838	17.491	17.424	17.166	16.962
M18 x 0.5	0.5	6g	17.980	17.874	17.655	17.565	17.439	17.257
M18 x 0.5	0.5	4g6g	17.980	17.874	17.655	17.599	17.439	17.291

ANSI Inch Unit Hardware Design Guide
Length of Screw Thread Engagement per. ISO 965-1 Calculator, Formula and Table Length of engagement of mating threads is selected to utilize full tensile strength of a bolt prior to shearing and nut threads.
Fastener Thread Designations and Definitions Pitch, Minor, Major Diameters
Standard External Metric Thread and Fastener Sizes M 0.25 - M 1.4
Metric External Table Chart Thread Sizes M 20 - M 55
Metric External Table Chart Thread Sizes M 56 - M 78
Metric External Table Chart Thread Sizes M 80 - M 100
Metric External Table Chart Thread Sizes M 105 - M 135
Metric External Table Chart Thread Sizes M 140 to M 175
Metric External Table Chart Thread Sizes M 180 to M 255
Metric External Table Chart Thread Sizes M 260 to M 1060

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