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滾牙徑

也叫搓牙徑、輾牙徑、滾造徑，指的是外螺紋（螺絲）在沒有完成滾牙或搓牙之前的、還處于光桿狀態下的直徑，即螺紋搓制和滾制前的毛坯直徑。這并不同于“螺紋的大徑、中徑、底徑”等概念，而是在生產制造過程中的一個工藝參數。這一參數僅對螺絲制造者有參考意義，對于螺絲使用者沒有具體意義。

公制外螺紋的搓牙徑（滾牙徑）表

單位:MM;
標準來源：GB/T18685-2017
表中4h 6h 6g 6f 6e等指的是螺紋公差等級，外螺紋常用為6g

螺紋
螺距(牙距）
4h	最大值
	最小值
6h	最大值
	最小值
6g (常用)	最大值
	最小值
6f	最大值
	最小值
6e	最大值
	最小值

M 1	M 1	M 1.1	M 1.1	M 1.2	M 1.2	M 1.4	M 1.4	M 1.6	M 1.6	M 1.8	M 1.8	M 2	M 2	M 2.2	M 2.2	M 2.5	M 2.5	M 3	M 3	M 3.5	M 3.5	M 4	M 4	M 4.5	M 4.5	M 5	M 5	M 6	M 6	M 7	M 7	M 8	M 8	M 8	M 10	M 10	M 10	M 10	M 12	M 12	M 12	M 12	M 14	M 14	M 14	M 16	M 16	M 16	M 18	M 18	M 18	M 18	M 20	M 20	M 20	M 20	M 22	M 22	M 22	M 22	M 24	M 24	M 24	M 24	M 27	M 27	M 27	M 27	M 30	M 30	M 30	M 30	M 33	M 33	M 33	M 36	M 36	M 36	M 36	M 39	M 39	M 39	M 39	M 42	M 42	M 42	M 42	M 45	M 45	M 45	M 45	M 48	M 48	M 48	M 48	M 52	M 52	M 52	M 52
0.25	0.2	0.25	0.2	0.25	0.2	0.3	0.2	0.35	0.2	0.35	0.2	0.4	0.25	0.45	0.25	0.45	0.35	0.5	0.35	0.6	0.35	0.7	0.5	0.75	0.5	0.8	0.5	1	0.75	1	0.75	1.25	1	0.75	1.5	1.25	1	0.75	1.75	1.5	1.25	1	2	1.5	1	2	1.5	1	2.5	2	1.5	1	2.5	2	1.5	1	2.5	2	1.5	1	3	2	1.5	1	3	2	1.5	1	3.5	2	1.5	1	3.5	2	1.5	4	3	2	1.5	4	3	2	1.5	4	3	2	1.5	4	3	2	1.5	4	3	2	1.5	4	3	2	1.5
0.833	0.864	0.933	0.963	1.032	1.063	1.199	1.262	1.366	1.462	1.565	1.661	1.733	1.829	1.901	2.029	2.199	2.263	2.665	2.762	3.098	3.26	3.539	3.666	4.006	4.165	4.472	4.664	5.344	5.501	6.341	6.499	7.184	7.338	7.498	9.016	9.179	9.335	9.497	10.846	11.011	11.17	11.333	12.689	13.008	13.332	14.685	15.006	15.331	16.364	16.681	17.004	17.33	18.359	18.679	19.003	19.33	20.356	20.677	20.997	21.329	22.03	22.675	22.996	23.329	25.025	25.673	25.995	26.328	27.711	28.671	28.994	29.328	30.707	31.67	31.994	33.386	34.016	34.669	34.993	36.382	37.014	37.668	37.993	39.379	40.012	40.667	40.992	42.376	43.01	43.666	43.992	45.373	46.001	46.666	46.991	49.370	49.999	50.665	50.991
0.817	0.849	0.916	0.948	1.015	1.048	1.182	1.247	1.348	1.445	1.547	1.645	1.714	1.81	1.881	2.01	2.179	2.245	2.644	2.742	3.078	3.241	3.513	3.642	3.981	4.141	4.445	4.64	5.312	5.471	6.309	6.469	7.152	7.307	7.468	8.986	9.147	9.304	9.466	10.818	10.976	11.134	11.298	12.659	12.973	13.297	14.655	14.97	15.296	16.339	16.651	16.969	17.295	18.335	18.649	18.967	19.294	20.332	20.647	20.966	21.294	22.003	22.639	22.96	23.288	24.998	25.637	25.959	26.288	27.681	28.635	28.958	29.287	30.677	31.634	31.957	33.358	33.989	34.633	34.957	36.354	36.987	37.632	37.956	39.351	39.985	40.631	40.956	42.348	42.983	43.63	43.955	45.335	45.975	46.624	46.95	49.332	49.973	50.623	50.95
0.83	0.864	0.93	0.963	1.029	1.063	1.196	1.262	1.363	1.462	1.562	1.661	1.73	1.826	1.898	2.026	2.196	2.26	2.662	2.759	3.092	3.257	3.528	3.658	3.996	4.157	4.461	4.657	5.328	5.49	6.325	6.488	7.166	7.323	7.487	8.994	9.161	9.32	9.485	10.822	10.99	11.15	11.318	12.663	12.986	13.317	14.658	14.984	15.316	16.324	16.655	16.982	17.315	18.32	18.652	18.981	19.315	20.316	20.65	20.974	21.314	21.995	22.649	22.973	23.314	24.99	25.647	25.971	26.313	27.656	28.645	28.971	29.313	30.651	31.644	31.97	33.326	33.98	34.642	34.969	36.322	36.978	37.642	37.969	39.319	39.976	40.641	40.968	42.316	42.975	43.64	43.968	45.313	45.967	46.64	46.968	49.31	49.965	50.639	50.967
0.798	0.831	0.897	0.931	0.996	1.03	1.162	1.229	1.325	1.427	1.524	1.627	1.689	1.79	1.855	1.99	2.154	2.222	2.617	2.717	3.046	3.216	3.479	3.615	3.948	4.114	4.41	4.613	5.271	5.434	6.268	6.432	7.109	7.266	7.431	8.939	9.104	9.263	9.429	10.764	10.926	11.087	11.255	12.599	12.923	13.254	14.595	14.92	15.253	16.276	16.591	16.919	17.252	18.271	18.589	18.917	19.251	20.268	20.587	20.916	21.251	21.928	22.575	22.905	23.243	24.924	25.573	25.904	26.243	27.601	28.571	28.903	29.242	30.597	31.57	31.902	33.274	33.914	34.569	34.902	36.27	36.912	37.568	37.901	39.267	39.91	40.567	40.901	42.264	42.908	43.566	43.9	45.249	45.895	46.556	46.89	49.247	49.893	50.555	50.89
0.813	0.847	0.912	0.946	1.011	1.046	1.178	1.245	1.345	1.445	1.543	1.645	1.711	1.808	1.878	2.008	2.177	2.241	2.642	2.74	3.071	3.238	3.507	3.638	3.974	4.137	4.437	4.637	5.303	5.468	6.3	6.466	7.138	7.297	7.465	8.962	9.133	9.294	9.463	10.789	10.958	11.122	11.292	12.625	12.954	13.291	14.62	14.952	15.29	16.282	16.617	16.95	17.289	18.278	18.614	18.949	19.289	20.274	20.612	20.942	21.288	21.947	22.611	22.941	23.288	24.942	25.609	25.939	26.287	27.603	28.607	28.939	29.287	30.598	31.606	31.938	33.266	33.932	34.605	34.937	36.262	36.93	37.604	37.937	39.259	39.928	40.603	40.936	42.256	42.927	43.602	43.936	45.253	45.919	46.602	46.936	49.25	49.917	50.601	50.935
0.78	0.814	0.879	0.914	0.978	1.013	1.144	1.212	1.307	1.41	1.505	1.61	1.67	1.772	1.835	1.972	2.134	2.203	2.597	2.698	3.025	3.197	3.457	3.595	3.926	4.094	4.387	4.593	5.245	5.412	6.242	6.41	7.081	7.24	7.409	8.907	9.076	9.237	9.407	10.73	10.894	11.059	11.229	12.561	12.891	13.228	14.557	14.889	15.227	16.234	16.553	16.887	17.226	18.229	18.551	18.885	19.225	20.226	20.549	20.884	21.225	21.881	22.537	22.873	23.217	24.876	25.535	25.872	26.217	27.548	28.533	28.871	29.216	30.544	31.532	31.87	33.214	33.866	34.531	34.87	36.21	36.864	37.53	37.869	39.207	39.862	40.529	40.869	42.204	42.86	43.528	43.868	45.189	45.847	46.518	46.858	49.187	49.845	50.517	50.858
-	-	-	-	-	-	-	-	1.33	-	1.528	-	1.696	-	1.863	-	2.162	2.226	2.626	2.725	3.056	3.223	3.491	3.622	3.958	4.121	4.423	4.621	5.289	5.452	6.286	6.45	7.124	7.283	7.449	8.949	9.12	9.28	9.447	10.775	10.945	11.108	11.278	12.611	12.941	13.277	14.606	14.939	15.276	16.266	16.603	16.937	17.275	18.262	18.6	18.936	19.275	20.258	20.598	20.929	21.274	21.932	22.597	22.928	23.274	24.927	25.595	25.926	26.273	27.586	28.593	28.926	29.273	30.581	31.592	31.925	33.251	33.917	34.591	34.924	36.247	36.915	37.59	37.924	39.244	39.913	40.589	40.923	42.241	42.912	43.588	43.923	45.238	45.904	46.588	46.923	49.235	49.902	50.587	50.922
-	-	-	-	-	-	-	-	1.292	-	1.49	-	1.655	-	1.82	-	2.119	2.188	2.581	2.683	3.01	3.182	3.441	3.579	3.91	4.078	4.373	4.577	5.231	5.396	6.228	6.394	7.067	7.226	7.393	8.894	9.062	9.223	9.391	10.716	10.881	11.045	11.215	12.547	12.878	13.214	14.543	14.876	15.213	16.218	16.539	16.874	17.212	18.213	18.537	18.872	19.211	20.21	20.535	20.871	21.211	21.866	22.523	22.86	23.203	24.861	25.521	25.859	26.203	27.531	28.519	28.858	29.202	30.527	31.518	31.857	33.199	33.851	34.517	34.857	36.195	36.849	37.516	37.856	39.192	39.847	40.515	40.856	42.189	42.845	43.514	43.855	45.174	45.832	46.504	46.845	49.172	49.83	50.503	50.845
-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	2.612	-	3.04	-	3.473	3.608	3.94	4.107	4.401	4.607	5.269	5.434	6.266	6.432	7.103	7.263	7.431	8.927	9.099	9.26	9.429	10.752	10.923	11.087	11.258	12.592	12.92	13.257	14.587	14.917	15.256	16.244	16.584	16.915	17.255	18.24	18.581	18.914	19.255	20.236	20.579	20.907	21.254	21.91	22.578	22.906	23.254	24.905	25.576	25.904	26.253	27.566	28.574	28.904	29.253	30.561	31.573	31.903	33.231	33.895	34.572	34.902	36.227	36.893	37.571	37.902	39.224	39.891	40.57	40.901	42.221	42.89	43.569	43.901	45.218	45.882	46.569	46.901	49.215	49.88	50.568	50.9
-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	2.567	-	2.993	-	3.423	3.565	3.892	4.064	4.351	4.563	5.211	5.378	6.208	6.376	7.046	7.206	7.375	8.872	9.041	9.203	9.373	10.693	10.859	11.024	11.195	12.528	12.856	13.194	14.524	14.854	15.193	16.196	16.52	16.852	17.192	18.192	18.518	18.85	19.191	20.188	20.516	20.849	21.191	21.844	22.504	22.838	23.183	24.839	25.502	25.837	26.183	27.511	28.5	28.836	29.182	30.507	31.499	31.835	33.179	33.829	34.498	34.835	36.175	36.827	37.497	37.834	39.172	39.825	40.496	40.834	42.169	42.823	43.495	43.833	45.154	45.81	46.485	46.823	49.152	49.808	50.484	50.823

美制外螺紋的搓牙徑（滾牙徑）表

單位:螺紋采用英寸inch為單位，滾造徑值采用毫米MM；
標準來源： GB/T34632-2017
表中2A 3A指的螺紋公差等級，常用為2A

螺紋
每英寸牙數
螺紋系列代號
3A①	最大值
	最小值
2A (常用)	最大值
	最小值

0#	1#	1#	2#	2#	3#	3#	4#	4#	5#	5#	6#	6#	8#	8#	10#	10#	12#	12#	12#	1/4	1/4	1/4	5/16	5/16	5/16	3/8	3/8	3/8	7/16	7/16	7/16	7/16	1/2	1/2	1/2	1/2	9/16	9/16	9/16	9/16	5/8	5/8	5/8	5/8	5/8	3/4	3/4	3/4	3/4	7/8	7/8	7/8	7/8	7/8	1	1	1	1	?1-1/8	?1-1/8	?1-1/8	?1-1/8	?1-1/8	1-1/4	1-1/4	1-1/4	1-1/4	1-1/4	1-3/8	1-3/8	1-3/8	1-3/8	1-3/8	1-1/2	1-1/2	1-1/2	1-1/2	1-1/2	1-5/8	1-5/8	1-5/8	1-5/8	1-3/4	1-3/4	1-3/4	1-7/8	1-7/8	1-7/8	2	2	2
80	64	72	56	64	48	56	40	48	40	44	32	40	32	36	24	32	24	28	32	20	28	32	18	24	32	16	24	32	14	16	20	28	13	16	20	28	12	16	18	24	11	12	16	18	24	10	12	16	20	9	12	14	16	20	8	12	16	20	7	8	12	16	18	7	8	12	16	18	6	8	12	16	18	6	8	12	16	18	8	12	16	18	8	12	16	8	12	16	8	12	16
UNF	UNC	UNF	UNC	UNF	UNC	UNF	UNC	UNF	UNC	UNF	UNC	UNF	UNC	UNF	UNC	UNF	UNC	UNF	UNEF	UNC	UNF	UNEF	UNC	UNF	UNEF	UNC	UNF	UNEF	UNC	UN	UNF	UNEF	UNC	UN	UNF	UNEF	UNC	UN	UNF	UNEF	UNC	UN	UN	UNF	UNEF	UNC	UN	UNF	UNEF	UNC	UN	UNF	UN	UNEF	UNC	UNF	UN	UNEF	UNC	UN	UNF	UN	UNEF	UNC	UN	UNF	UN	UNEF	UNC	UN	UNF	UN	UNEF	UNC	UN	UNF	UN	UNEF	UN	UN	UN	UNEF	UN	UN	UN	UN	UN	UN	UN	UN	UN
1.312	1.593	1.619	1.886	1.921	2.167	2.213	2.433	2.496	2.761	2.793	2.993	3.089	3.647	3.703	4.143	4.304	4.8	4.892	4.963	5.53	5.749	5.821	7.026	7.239	7.406	8.492	8.82	8.99	9.936	10.075	10.276	10.501	11.436	11.659	11.861	12.088	12.901	13.239	13.354	13.574	14.366	14.494	14.824	14.94	15.161	17.389	17.664	17.996	18.202	20.379	20.828	21.02	21.164	21.372	23.33	24	24.337	24.546	26.233	26.5	27.173	27.511	27.63	29.379	29.661	30.343	30.682	30.802	32.176	32.833	33.517	33.856	33.976	35.346	36.005	36.691	37.031	37.151	39.17	39.86	40.201	40.3ZZ	42.343	43.034	43.376	45.517	46.209	46.55	48.69	49.383	49.725
1.301	1.579	1.606	1.87	1.907	2.152	2.198	2.413	2.478	2.742	2.774	2.972	3.068	3.626	3.681	4.12	4.281	4.774	4.869	4.937	5.503	5.727	5.799	6.995	7.214	7.381	8.463	8.794	8.967	9.904	10.041	10.245	10.478	11.397	11.625	11.827	12.062	12.879	13.21	13.321	13.549	14.342	14.458	14.793	14.905	15.136	17.359	17.627	17.96	18.17	20.348	20.796	20.984	21.135	21.341	23.294	23.963	24.309	24.515	26.179	26.461	27.133	27.48	27.596	29.346	29.629	30.304	30.654	30.77	32.132	32.798	33.475	33.826	33.942	35.299	35.968	36.646	37	37.116	39.139	39.832	40.176	40.29	42.31	43.003	43.348	45.483	46.178	46.522	48.654	49.352	49.697
1.297	1.575	1.601	1.868	1.903	2.147	2.193	2.41	2.476	2.738	2.773	2.969	3.066	3.62	3.68	4.114	4.278	4.771	4.863	4.934	5.499	5.719	5.792	6.991	7.207	7.377	8.456	8.789	8.961	9.897	10.036	10.239	10.47	11.394	11.62	11.825	12.056	12.856	13.199	13.315	13.54	14.319	14.45	14.785	14.901	15.126	17.339	17.617	17.954	18.165	20.327	20.781	20.976	21.122	21.335	23.275	23.951	24.295	24.506	26.172	26.442	27.124	27.469	27.59	29.318	29.603	30.294	30.64	30.76	32.11	32.772	33.465	33.814	33.934	35.28	35.944	36.638	36.986	37.109	39.108	39.809	40.155	40.279	42.279	42.983	43.33	45.452	46.158	46.505	48.626	49.332	49.679
1.278	1.553	1.581	1.845	1.882	2.122	2.168	2.381	2.448	2.706	2.744	2.938	3.035	3.589	3.645	4.078	4.244	4.732	4.827	4.895	5.457	5.685	5.757	6.943	7.165	7.339	8.406	8.747	8.923	9.842	9.981	10.188	10.431	11.33	11.563	11.77	12.015	12.81	13.148	13.262	13.497	14.267	14.388	14.731	14.842	15.084	17.279	17.553	17.895	18.113	20.263	20.721	20.914	21.07	21.284	23.207	23.883	24.241	24.455	26.083	26.369	27.053	27.415	27.534	29.247	29.538	30.221	30.587	30.703	32.025	32.702	33.39	33.758	33.877	35.193	35.872	36.561	36.93	37.049	39.044	39.753	40.104	40.226	42.212	42.925	43.279	45.38	46.099	46.454	48.552	49.271	49.626

① 計算3A螺紋毛坯直徑時，螺紋環規通、止端中徑的內縮量減半。

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