螺絲尺寸

standard-screw

Screws Material List

Tapping Screw M/M Type A
Size	Threads Per In	Major Diameter		Pitch Diameter
Size	Threads Per In	Max	Min	Max	Min
M2	32	2.1	2.0	1.75	1.7
M2.3	32	2.4	2.3	2.0	1.95
M2.6	28	2.7	2.6	2.2	2.65
M3	24	3.1	3.0	2.45	2.4
M3.5	18	3.6	3.5	2.85	2.8
M4	16	4.1	4.0	3.25	3.2
M4.5	14	4.6	4.5	3.55	3.5
M5	12	5.1	5.0	3.95	3.9
M6	10	6.1	6.0	4.85	4.8
M8	7	8.1	8.0	6.45	6.4
M10	6	10.1	10.0	7.9	7.85

Tapping Screw M/M Type B
Size	Threads Per In	Major Diameter		Pitch Diameter
Size	Threads Per In	Max	Min	Max	Min
M2	40	2.0	1.9	1.70	1.65
M2.3	32	2.3	2.2	1.90	1.85
M2.6	28	2.6	2.5	2.15	2.10
M3	24	3.0	2.9	2.45	2.4
M3.5	20	3.5	3.4	2.85	2.8
M4	18	4.0	3.9	3.3	3.25
M4.5	16	4.5	4.4	3.6	3.55
M5	16	5.0	4.9	4.1	4.05
M6	14	6.0	5.9	5.05	5.0
M8	12	8.0	7.9	6.75	6.7

Machine Screw UNF 2A Q (60°)
Size	Threads Per In	Major Diameter		Pitch Diameter		Bulge Diameter
Size	Threads Per In	Max	Min	Max	Min	Max	Min
NO:0	80	1.511	1.430	1.306	1.260	0.206	0.190
NO:1	72	1.839	1.750	1.610	1.562	0.228	0.211
NO:2	64	2.169	2.073	1.913	1.862	0.257	0.237
NO:3	56	2.497	2.393	2.202	2.146	0.294	0.271
NO:4	48	2.827	2.713	2.484	2.423	0.343	0.317
NO:5	44	3.157	3.035	2.781	2.718	0.375	0.346
NO:6	40	3.485	3.355	3.073	3.007	0.412	0.381
NO:8	36	4.145	4.006	3.688	3.617	0.458	0.423
NO:10	32	4.803	4.651	4.288	4.211	0.515	0.475
NO:12	28	5.461	5.296	4.872	4.790	0.589	0.544
1/4	28	6.325	6.160	5.735	5.652	0.589	0.544
5/16	24	7.910	7.727	7.221	7.127	0.687	0.634
3/8	24	9.497	9.314	8.809	8.712	0.687	0.634
7/16	20	11.079	10.874	10.254	10.147	0.825	0.762
1/2	20	12.667	12.461	11.841	11.732	0.825	0.762
9/16	18	14.252	14.031	13.335	13.221	0.917	0.846
5/8	18	15.839	15.618	14.922	14.803	0.917	0.846
3/4	16	19.012	18.773	17.981	17.854	1.031	0.952
7/8	14	22.184	21.923	21.006	20.869	1.179	1.088
1"	12	25.354	25.065	23.980	23.830	1.375	1.269

Machine Screw BSW 2A Q (55°)
Size	Threads Per In	Major Diameter		Pitch Diameter		Bulge Diameter
Size	Threads Per In	Max	Min	Max	Min	Max	Min
1/16	60	1.560	1.470	1.287	1.227	0.273	0.252
3/32	48	2.361	2.155	2.023	1.843	0.338	0.318
1/8	40	3.155	3.045	2.743	2.664	0.412	0.381
5/32	32	3.945	3.795	3.432	3.321	0.513	0.474
3/16	24	4.742	4.592	4.055	3.958	0.687	0.634
1/4	20	6.330	6.160	5.505	5.398	0.825	0.762
5/16	18	7.910	7.72	6.994	6.874	0.916	0.846
3/8	16	9.500	9.310	8.469	8.358	1.031	0.952
7/16	14	11.082	10.892	9.903	9.804	1.179	1.088
1/2	12	12.670	12.460	11.299	11.194	1.371	1.266
9/16	12	14.258	14.047	12.887	12.781	1.371	1.266
5/8	11	15.845	15.605	14.345	14.220	1.500	1.385
3/4	10	19.020	18.780	17.369	17.256	1.651	1.524
7/8	9	22.195	21.935	20.356	20.243	1.839	1.692
1"	8	25.370	25.110	23.307	23.205	2.063	1.905

Machine Screw UNC 2A Q (60°)
Size	Threads Per In	Major Diameter		Pitch Diameter		Bulge Diameter
Size	Threads Per In	Max	Min	Max	Min	Max	Min
NO:1	64	1.839	1.742	1.598	1.560	0.241	0.237
NO:2	56	2.169	2.065	1.875	1.821	0.294	0.271
NO:3	48	2.497	2.383	2.154	2.096	0.343	0.317
NO:4	40	2.824	2.695	2.413	2.350	0.411	0.381
NO:5	40	3.155	3.025	2.743	2.677	0.411	0.381
NO:6	32	3.485	3.332	2.969	2.898	0.515	0.475
NO:8	32	4.143	3.990	3.627	3.553	0.515	0.475
NO:10	24	4.801	4.618	4.112	4.028	0.687	0.634
NO:12	24	5.461	5.278	4.773	4.686	0.687	0.634
1/4	20	6.322	6.116	5.497	5.403	0.835	0.762
5/16	18	7.907	7.686	6.990	6.888	0.917	0.846
3/8	16	9.492	9.253	8.461	8.349	1.031	0.952
7/16	14	11.077	10.815	9.898	9.779	1.179	1.088
1/2	13	12.662	12.385	11.392	11.265	1.269	1.171
9/16	12	14.247	13.957	12.873	12.741	1.375	1.269
5/8	11	15.834	15.527	14.336	14.196	1.500	1.385
3/4	10	19.004	18.677	17.353	17.203	1.651	1.524
7/8	9	22.177	21.824	20.343	20.183	1.834	1.693
1"	8	25.349	24.968	23.287	23.114	2.063	1.905

Machine Screw M/M 2A Q (60°)
Size	Threads Per In	Major Diameter		Pitch Diameter		Bulge Diameter
Size	Threads Per In	Max	Min	Max	Min	Max	Min
1.4	0.3	1.380	1.320	1.185	1.135	0.195	0.180
1.6	0.35	1.581	1.496	1.354	1.291	0.227	0.210
1.7	0.35	1.680	1.610	1.453	1.393	0.227	0.210
2.0	0.4	1.980	1.890	1.720	1.660	0.260	0.240
2.3	0.4	2.280	2.190	2.020	1.960	0.260	0.240
2.6	0.45	2.580	2.480	2.288	2.218	0.292	0.270
3.0	0.5	2.980	2.874	2.655	2.580	0.325	0.300
3.0	0.6	2.980	2.870	2.590	2.510	0.390	0.360
3.5	0.6	3.470	3.360	3.080	3.010	0.390	0.360
4.0	0.7	3.978	3.838	3.523	3.433	0.455	0.420
4.0	0.75	3.978	3.838	3.491	3.388	0.487	0.450
4.5	0.75	4.470	4.340	3.983	3.893	0.487	0.450
5.0	0.8	4.976	4.826	4.456	4.361	0.520	0.480
5.0	0.9	4.970	4.820	4.385	4.280	0.585	0.540
6.0	1.0	5.970	5.820	5.320	5.220	0.650	0.600
7.0	1.0	6.970	6.820	6.320	6.220	0.650	0.600
8.0	1.25	7.960	7.790	7.148	7.038	0.812	0.752
10.0	1.25	9.960	9.790	9.148	9.038	0.812	0.752
10.0	1.5	9.960	9.770	8.986	8.866	0.974	0.904
12.0	1.5	11.960	11.770	10.994	10.860	0.974	0.904
12.0	1.75	11.950	11.760	10.813	10.683	1.137	1.050
14.0	2.0	13.950	13.740	12.651	12.511	1.299	1.229
16.0	2.0	15.950	15.740	14.650	14.511	1.299	1.229

Tapping Screw ASA Type AB
Size	Threads Per In	Major Diameter		Pitch Diameter
Size	Threads Per In	Max	Min	Max	Min
NO:0	48	1.524	1.447	1.25	1.20
NO:1	42	1.905	1.828	1.55	1.50
NO:2	32	2.235	2.133	1.75	1.70
NO:3	28	2.565	2.463	2.05	2.0
NO:4	24	2.895	2.794	2.30	2.25
NO:5	20	3.302	3.20	2.65	2.60
NO:6	20	3.530	3.429	2.85	2.80
NO:7	19	3.911	3.784	3.20	3.15
NO:8	18	4.21	4.089	3.40	3.35
NO:10	16	4.80	4.648	3.9	3.85
NO:12	14	5.461	5.308	4.40	4.35
1/4	14	6.248	6.096	5.20	5.15
5/16	12	8.001	7.823	6.70	6.65

Tapping Screw ASA Type A
Size	Threads Per In	Major Diameter		Pitch Diameter
Size	Threads Per In	Max	Min	Max	Min
NO:0	40	1.524	1.447	1.20	1.15
NO:1	32	1.905	1.828	1.50	1.45
NO:2	32	2.235	2.133	1.75	1.70
NO:3	28	2.565	2.463	2.05	2.0
NO:4	24	2.895	2.794	2.30	2.25
NO:5	20	3.302	3.20	2.65	2.60
NO:6	18	3.530	3.429	2.80	2.75
NO:7	16	3.911	3.784	3.1	3.05
NO:8	15	4.21	4.089	3.35	3.30
NO:9	14	4.48	4.34	3.45	3.40
NO:10	12	4.8	4.684	3.75	3.7
NO:12	11	5.461	5.308	4.30	4.25
NO:14	10	6.31	6.158	5.1	5.05

Tapping Screw W.T. Type A
Size	Threads Per In	Major Diameter		Pitch Diameter
Size	Threads Per In	Max	Min	Max	Min
3/32	32	2.48	2.38	2.0	1.95
1/8	24	3.27	3.17	2.65	2.6
5/32	16	4.07	3.97	3.20	3.15
3/16	12	4.86	4.76	3.75	3.70
1/4	10	6.45	6.35	5.20	5.15
5/16	9	8.0	7.9	6.35	6.3
3/8	7	9.63	9.53	7.65	7.6
1/2	6	12.8	12.7	10.45	10.4

Tapping Screw ASA Type B
Size	Threads Per In	Major Diameter		Pitch Diameter
Size	Threads Per In	Max	Min	Max	Min
NO:0	48	1.524	1.447	1.25	1.20
NO:1	42	1.905	1.828	1.55	1.50
NO:2	32	2.235	2.133	1.70	1.65
NO:3	28	2.565	2.463	2.05	2.0
NO:4	24	2.895	2.794	2.30	2.25
NO:5	20	3.302	3.20	2.65	2.60
NO:6	20	3.530	3.429	2.85	2.80
NO:7	19	3.911	3.784	3.20	3.15
NO:8	18	4.210	4.089	3.40	3.35
NO:10	16	4.80	4.648	3.85	3.80
NO:12	14	5.461	5.308	4.35	4.30
1/4	14	6.248	6.096	5.20	5.15
5/16	12	8.001	7.823	6.35	6.30
3/8	12	9.652	9.423	7.84	7.59
7/16	10	11.176	10.947	9.118	8.86
1/2	10	12.801	12.573	10.74	10.49

Wood Screw M/M Type
Size	Threads Per In	Major Diameter		Pitch Diameter
Size	Threads Per In	Max	Min	Max	Min
1.6	0.8	1.65	1.55	1.2	1.15
1.8	0.9	1.85	1.75	1.4	1.35
2.1	1.0	2.17	2.03	1.6	1.55
2.4	1.1	2.47	2.33	1.9	1.85
2.7	1.2	2.77	2.63	2.1	2.05
3.1	1.3	3.17	3.03	2.45	2.4
3.5	1.4	3.6	3.4	2.85	2.75
3.8	1.6	3.9	3.7	3.05	3.0
4.1	1.8	4.2	4.0	3.3	3.25
4.5	1.9	4.6	4.4	3.5	3.4
4.8	2.1	4.92	4.68	3.8	3.75
5.1	2.2	5.22	4.98	4.0	3.9
5.5	2.4	5.62	5.38	4.4	4.3
5.8	2.6	5.92	5.68	4.6	4.5
6.2	2.7	6.32	6.08	4.85	4.75
6.8	3.1	6.95	6.65	5.3	5.2
7.5	3.3	7.65	7.35	5.8	5.7
8	3.3	8.15	7.85	6.30	6.20
9.5	3.8	9.65	9.35	7.6	7.5

Wood Screw ASA Type
Size	Threads Per In	Major Diameter		Pitch Diameter
Size	Threads Per In	Max	Min	Max	Min
0#	32	1.625	1.346	1.20	1.15
1#	28	1.955	1.676	1.5	1.45
2#	26	2.286	2.006	1.7	1.65
3#	24	2.616	2.336	2.0	1.95
4#	22	2.946	2.667	2.25	2.2
5#	20	3.276	2.997	2.6	2.55
6#	18	3.606	3.327	2.8	2.75
7#	16	3.937	3.657	3.1	3.05
8#	15	4.267	3.987	3.35	3.3
9#	14	4.597	4.318	3.45	3.4
10#	13	4.927	4.648	3.85	3.75
12#	11	5.588	5.308	4.35	4.25
14#	10	6.248	5.969	5.0	4.95
16#	9	6.908	6.629	5.35	5.3

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