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技術資料>螺紋大徑中徑小徑表

定義
公制外螺紋
公制內螺紋
美制外螺紋
美制內螺紋

定義

什么叫螺紋的大徑小徑?

一句話：牙頂叫大徑，牙底叫小徑——無論是內螺紋還是外螺紋。如下圖所示（左為外螺紋，右為內螺紋）：

至于中徑，內螺紋外螺紋都一樣，指它們的山腰中點的值，中徑是一個理論值

6g公制外螺紋（即常用螺絲）的大徑中徑小徑表

單位：MM

外螺紋規格		大徑（牙頂）		中徑		小徑（牙底）公稱
公稱直徑	牙距	最大	最小	最大	最小	小徑（牙底）公稱
M1.4	0.3	1.382	1.307	1.187	1.131	1.057
M1.6	0.35	1.581	1.496	1.354	1.291	1.548
M2.0	0.4	1.981	1.886	1.721	1.654	1.548
M2.2	0.45	2.18	2.08	1.888	1.817	1.693
M2.5	0.45	2.48	2.38	2.188	2.117	1.993
M3.0	0.5	2.98	2.874	2.655	2.58	2.439
M3.5	0.6	3.479	3.354	3.089	3.004	2.83
M4.0	0.7	3.978	3.838	3.523	3.433	3.22
M4.5	0.75	4.478	4.338	3.991	3.901	3.666
M5.0	0.8	4.976	4.826	4.456	4.361	4.11
M6.0	1	5.974	5.794	5.325	5.213	4.892
M7.0	1	6.974	6.794	6.325	6.213	5.892
M8.0	1.25	7.972	7.76	7.325	7.213	6.619
M9.0	1.25	8.972	8.76	8.16	8.042	7.619
M10	1.5	9.968	9.732	8.994	8.862	8.344
M11	1.5	10.968	10.732	9.994	9.862	9.344
M12	1.75	11.966	11.701	10.829	10.679	10.072
M14	2	13.962	13.682	12.663	12.503	11.797
M16	2	15.962	15.682	14.663	14.503	13.797
M18	2.5	17.958	17.623	16.663	16.503	15.252
M20	2.5	19.958	19.623	18.334	18.164	17.252

以上表格數據摘自螺紋的大徑、中徑、小徑公差及計算方法，更詳細的大徑中徑小徑請點擊螺紋的大徑、中徑、小徑公差及計算方法

6H公制內螺紋（即常用螺母）的大徑中徑小徑表

接下來是公制6H內螺紋的大徑中徑小徑表：
單位：MM

內螺紋規格		大徑（牙底）	中徑		小徑(牙頂)
公稱直徑	牙距	大徑（牙底）	最大	最小	最大	最小
M1.4	0.3	1.418	1.28	1.205	1.142	1.075
M1.6	0.35	1.619	1.458	1.373	1.32	1.22
M2.0	0.4	2.019	1.83	1.74	1.679	1.567
M2.2	0.45	2.22	2.003	1.908	1.838	1.713
M2.5	0.45	2.52	2.303	2.303	2.138	2.013
M3.0	0.5	3.02	2.775	2.675	2.599	2.459
M3.5	0.6	3.521	3.222	3.11	3.01	2.85
M4.0	0.7	4.022	3.663	3.545	3.422	3.242
M4.5	0.75	4.522	4.131	4.013	3.878	3.688
M5.0	0.8	5.024	4.605	4.48	4.334	4.134
M6.0	1	6.026	5.5	5.35	5.153	4.917
M7.0	1	7.026	6.5	6.35	6.153	5.917
M8.0	1.25	8.028	7.348	7.188	6.912	6.647
M9.0	1.25	9.028	8.348	8.188	7.912	7.647
M10	1.5	10.032	9.206	9.026	8.676	8.376
M11	1.5	11.032	10.21	10.03	9.676	9.376
M12	1.75	12.034	11.06	10.86	10.44	10.11
M14	2	14.038	12.91	12.7	12.21	11.84
M16	2	16.038	14.91	14.7	14.21	13.84
M18	2	18.038	16.91	16.7	15.74	15.29
M20	2.5	20.042	18.6	18.38	17.74	17.29

以上表格數據摘自螺紋的大徑、中徑、小徑公差及計算方法，更詳細的大徑中徑小徑請點擊螺紋的大徑、中徑、小徑公差及計算方法

美制外螺紋（螺絲）的大徑中徑小徑表

下表中螺紋規格采用美制常用規范如4-40UNC，但其它尺寸統一采用的單位為公制毫米MM：

外螺紋規格	公差等級	大徑（外徑）		中徑		小徑
外螺紋規格	公差等級	Max	Min	Max	Min	Max
1-64UNC	2A	1.83896	1.74244	1.58242	1.53162	1.36652
1-64UNC	3A	1.8542	1.75768	1.59766	d	1.38176
1-72UNF	2A	1.83896	1.75006	1.61036	1.5621	1.41986
1-72UNF	3A	1.8542	1.7653	1.6256	1.59004	1.4351
2-56UNC	2A	2.16916	2.06502	1.87452	1.82118	1.63068
2-56UNC	3A	2.1844	2.08026	1.88976	1.84912	1.64592
2-64UNF	2A	2.16916	2.07264	1.91262	1.86182	1.69672
2-64UNF	3A	2.1844	2.08788	1.92786	1.88976	1.71196
3-48UNC	2A	2.49682	2.38252	2.15392	2.0955	1.86436
3-48UNC	3A	2.5146	2.4003	2.1717	2.12852	1.88214
3-56UNF	2A	2.49682	2.39268	2.20218	2.1463	1.95834
3-56UNF	3A	2.5146	2.41046	2.21996	2.17932	1.97612
4-40UNC	2A	2.82448	2.69494	2.413	2.3495	2.06756
4-40UNC	3A	2.8448	2.71526	2.43332	2.38506	2.08788
4-48UNF	2A	2.82702	2.71272	2.48412	2.42316	2.19456
4-48UNF	3A	2.8448	2.7305	2.5019	2.45618	2.21234
5-40UNC	2A	3.15468	3.02514	2.7432	2.67716	2.39776
5-40UNC	3A	3.175	3.04546	2.76352	2.71526	2.41808
5-44UNF	2A	3.15722	3.0353	2.7813	2.7178	2.46888
5-44UNF	3A	3.175	3.05308	2.79908	2.75082	2.48666
6-32UNC	2A	3.48488	3.33248	2.96926	2.89814	2.54
6-32UNC	3A	3.5052	3.3528	2.98958	2.93624	2.56032
6-40UNF	2A	3.48488	3.35534	3.0734	3.00736	2.72796
6-40UNF	3A	3.5052	3.37566	3.09372	3.04292	2.74828
8-32UNC	2A	4.14274	3.99034	3.62712	3.55346	3.19786
8-32UNC	3A	4.1656	4.0132	3.64998	3.5941	3.22072
8-36UNF	2A	4.14528	4.00558	3.68808	3.61696	3.30454
8-36UNF	3A	4.1656	4.0259	3.7084	3.65506	3.32486
10-24UNC	2A	4.8006	4.61772	4.11226	4.02844	3.54076
10-24UNC	3A	4.826	4.64312	4.13766	4.07416	3.56616
10-32UNF	2A	4.80314	4.65074	4.28752	4.21132	3.85826
10-32UNF	3A	4.826	4.6736	4.31038	4.25196	3.88112
12-24UNC	2A	5.461	5.27812	4.77266	4.6863	4.20116
12-24UNC	3A	5.4864	5.30352	4.79806	4.73202	4.22656
12-28UNF	2A	5.461	5.2959	4.87172	4.79044	4.37896
12-28UNF	3A	5.4864	5.3213	4.89712	4.83616	4.40436
1/4-20UNC	1A	6.32206	6.01218	5.49656	5.35432	4.81076
	2A	6.32206	6.11632	5.49656	5.40258	4.81076
	3A	6.35	6.14426	5.5245	5.45338	4.8387
1/4-28UNF	1A	6.3246	6.07568	5.73532	5.60832	5.24256
	2A	6.3246	6.1595	5.73532	5.6515	5.24256
	3A	6.35	6.1849	5.76072	5.69722	5.26796
5/16-18UNC	1A	7.90702	7.57428	6.99008	6.83514	6.22808
	2A	7.90702	7.68604	6.99008	6.88848	6.22808
	3A	7.9375	7.71652	7.02056	6.94436	6.25856
5/16-24	1A	79095.6	7.63524	7.22122	7.08152	6.64972
	2A	7.90956	7.72668	7.22122	7.12724	6.64972
	3A	7.9375	7.75462	7.24916	7.18058	6.67766
3/8-16UNC	1A	9.49198	9.1313	8.46074	8.29564	7.59968
	2A	9.49198	9.25322	8.46074	8.34898	7.59968
	3A	9.525	9.28624	8.49376	8.40994	7.6327
3/8-24UNF	1A	9.49706	9.22274	8.80872	8.66394	8.23722
	2A	9.49706	9.31418	8.80872	8.7122	8.23722
	3A	9.525	9.34212	8.83666	8.763	8.26516
7/16-14UNC	1A	11.07694	10.68324	9.89838	9.71804	8.91794
	2A	11.07694	10.81532	9.89838	9.779	8.91794
	3A	11.1125	10.85088	9.93394	9.84504	8.9535
7/16-20UNF	1A	11.07948	10.7696	10.93978	10.0965	9.56818
	2A	11.07948	10.87374	10.93978	10.1473	9.56818
	3A	11.1125	10.90676	10.3124	10.20826	9.6012
1/2-13UNC	1A	12.6619	12.24788	11.3919	11.20394	10.25906
	2A	12.6619	12.38504	11.3919	11.2649	10.33526
	3A	12.7	12.42314	11.43	11.33602	10.37336
1/2-20UNF	1A	12.66698	12.3571	11.84148	11.67892	12.52728
	2A	12.66698	12.46124	11.84148	11.73226	12.52728
	3A	12.7	12.49426	11.8745	11.79322	11.19124
9/16-12UNC	1A	14.24686	13.80998	12.87272	12.6746	11.72718
	2A	14.24686	13.9573	12.87272	12.74064	11.72718
	3A	14.2875	13.99794	12.91336	12.8143	11.76782
9/16-18UNF	1A	14.25194	13.9192	13.335	13.16228	12.573
	2A	14.259814	14.03096	13.335	13.2207	12.573
	3A	14.2875	14.06652	13.37056	13.2842	12.60856
5/8-11UNC	1A	15.83436	15.37208	14.33576	14.12494	13.08608
	2A	15.83436	15.52702	14.33576	14.19606	13.08608
	3A	15.875	15.56766	14.3764	14.27226	13.12672
5/8-18UNF	1A	15.83944	15.5067	14.9225	14.7447	14.1605
	2A	15.83944	15.61846	14.9225	14.80312	14.1605
	3A	15.875	15.60322	14.95806	14.86916	14.19606
3/4-10UNC	1A	19.00428	18.51152	17.35328	17.12976	15.97914
	2A	19.00428	18.67662	17.35328	17.20342	15.97914
	3A	19.05	18.72234	17.399	17.28724	16.02486
3/4-16UNF	1A	19.0119	18.65122	17.98066	17.79016	17.1196
	2A	19.0119	18.77314	17.98066	17.85366	17.1196
	3A	19.05	18.81124	18.01876	17.92224	17.1577
7/8-9UNC	1A	22.17674	21.64842	20.34286	20.10156	18.81632
	2A	22.17674	21.82368	20.34286	20.18284	18.81632
	3A	22.225	21.87194	20.39112	20.27174	18.86458
7/8-14UNF	1A	22.18436	21.79066	21.0058	20.80006	20.02536
	2A	22.18436	21.92274	21.0058	20.86864	20.02536
	3A	22.225	21.96338	21.04644	20.9423	20.066
1-8UNC	1A	25.3492	24.7777	23.28672	23.03018	21.56968
	2A	25.3492	24.9682	23.28672	23.114	21.56968
	3A	25.4	25.019	23.33752	23.20798	21.62048
1-14UNF	1A	25.35682	24.96566	24.17826	23.9649	23.19528
	2A	25.35682	25.0952	24.17826	24.03602	23.19528
	3A	25.4	25.13838	24.22144	24.11476	23.23846

美制內螺紋（螺母）的大、中、小徑

下表螺紋規格為美制規范,如2-56UNC，但尺寸為公制單位毫米：

內螺紋規格	大徑（外徑）	中徑		小徑（底徑）
內螺紋規格	Min	Min	Max	Min	Max
1-64UNC	1.8542	1.59766	1.6637	1.42494	1.58242
1-64UNC	1.8542	1.59766	1.64592	1.42494	1.58242
1-72UNF	1.8542	1.6256	1.6891	1.4732	1.6129
1-72UNF	1.8542	1.6256	1.67386	1.4732	1.6129
2-56UNC	2.1844	1.88976	1.96088	1.69418	1.87198
2-56UNC	2.1844	1.88976	1.9431	1.69418	1.87198
2-64UNF	2.1844	1.92786	1.99644	1.75514	1.91262
2-64UNF	2.1844	1.92786	1.97866	1.75514	1.91262
3-48UNC	2.5146	2.1717	2.2479	1.94056	2.1463
3-48UNC	2.5146	2.1717	2.22758	1.94056	2.1463
3-56UNF	2.5146	2.21996	2.29108	2.02438	2.1971
3-56UNF	2.5146	2.21996	2.2733	2.02438	2.1971
4-40UNC	2.8448	2.43332	2.51714	2.15646	2.38506
4-40UNC	2.8448	2.43332	2.49428	2.15646	2.38506
4-48UNF	2.8448	2.5019	2.58064	2.27076	2.45872
4-48UNF	2.8448	2.5019	2.56032	2.27076	2.45872
5-40UNC	3.175	2.76352	2.84734	2.48666	2.69748
5-40UNC	3.175	2.76352	2.82702	2.48666	2.69748
5-44UNF	3.175	2.79908	2.88036	2.55016	2.74066
5-44UNF	3.175	2.54508	2.86004	2.55016	2.74066
6-32UNC	3.5052	2.98958	3.08356	2.6416	2.8956
6-32UNC	3.5052	2.98958	3.05816	2.6416	2.8956
6-40UNF	3.5052	3.09372	3.18008	2.8194	3.0226
6-40UNF	3.5052	3.09372	3.15722	2.8194	3.01244
8-32UNC	4.1656	3.64998	3.7465	3.302	3.5306
8-32UNC	4.1656	3.64998	3.7211	3.302	3.52806
8-36UNF	4.1656	3.7084	3.79984	3.4036	3.6068
8-36UNF	4.1656	3.7084	3.77698	3.4036	3.59664
10-24UNC	4.826	4.13766	4.24688	3.683	3.9624
10-24UNC	4.826	4.13766	4.21894	3.683	3.9497
10-32UNF	4.826	4.31038	4.40944	3.9624	4.1656
10-32UNF	4.826	4.31038	4.38404	3.9624	4.16814
12-24UNC	5.4864	4.79806	4.90982	4.3434	4.5974
12-24UNC	5.4864	4.79806	4.88188	4.3434	4.58978
12-28UNF	5.4864	4.89712	5.0038	4.4958	4.7244
12-28UNF	5.4864	4.89712	4.97586	4.4958	4.71678
1/4-20UNC	6.35	5.5245	5.70992	4.9784	5.2578
	6.35	5.5245	5.64896	4.9784	5.2578
	6.35	5.5245	5.61594	4.9784	5.25018
1/4-28UNF	6.35	5.76072	5.92582	5.3594	5.588
	6.35	6.82752	5.86994	5.3594	5.588
	6.35	6.82752	5.842	5.3594	5.5626
5/16-18UNC	7.9375	7.02056	7.22122	6.4008	6.731
	7.9375	7.02056	7.15518	6.4008	6.731
	7.9375	7.02056	7.11962	6.4008	6.6802
5/16-24	7.9375	7.24916	7.4295	6.7818	7.0358
	7.9375	7.24916	7.37108	6.7818	7.0358
	7.9375	7.24916	7.3406	6.7818	6.99516
3/8-16UNC	9.525	8.49376	8.70966	7.7978	8.1534
	9.525	8.49376	8.63854	7.7978	8.1534
	9.525	8.49376	8.60298	7.7978	8.08228
3/8-24UNF	9.525	8.83666	8.83666	8.382	8.636
	9.525	8.83666	8.96112	8.382	8.636
	9.525	8.83666	8.513064	8.382	9.4488
7/16-14UNC	11.1125	9.93394	10.16762	9.144	9.5504
	11.1125	9.93394	10.08888	9.144	9.5504
	11.1125	9.93394	10.05078	9.144	9.44118
7/16-20UNF	11.06678	10.287	10.49274	9.7282	10.033
	11.06678	10.287	10.42416	9.7282	10.033
	11.06678	10.287	10.39114	9.7282	9.94664
1/2-13UNC	12.7	11.43	11.67638	10.5918	11.0236
	12.7	11.43	11.5951	10.5918	11.0236
	12.7	11.43	11.55192	10.5918	10.88136
1/2-20UNF	12.7	11.8745	12.08786	11.3284	11.6078
	12.7	11.8745	12.01674	11.3284	11.6078
	12.7	11.8745	11.98118	11.3284	11.52398
9/16-12UNC	14.2875	12.91336	13.17244	11.9888	12.446
	14.2875	12.91336	14.008608	11.9888	12.446
	14.2875	12.91336	13.04544	11.9888	12.30122
9/16-18UNF	14.2875	13.37056	13.59662	12.7508	13.081
	14.2875	13.37056	13.52042	12.7508	13.081
	14.2875	13.37056	13.48232	12.7508	12.96924
5/8-11UNC	15.875	14.3764	14.64818	13.3858	13.8684
	15.875	14.3764	14.55928	13.3858	13.8684
	15.875	14.3764	14.51356	13.3858	13.69314
5/8-18UNF	15.875	14.95806	15.1892	14.351	14.6812
	15.875	14.95806	15.11046	14.351	14.6812
	15.875	14.95806	15.07236	14.351	14.5542
3/4-10UNC	19.05	17.399	17.6911	16.3068	16.8402
	19.05	17.399	17.59458	16.3068	16.8402
	19.05	17.399	17.54378	16.3068	16.6243
3/4-16UNF	19.05	18.01876	18.26768	17.3228	17.6784
	19.05	18.01876	18.18386	17.3228	17.6784
	19.05	18.01876	18.14322	17.3228	17.54632
7/8-9UNC	22.225	20.84832	20.70354	19.177	19.7612
	22.225	20.84832	20.5994	19.177	19.7612
	22.225	20.84832	20.54606	19.177	19.50974
7/8-14UNF	22.225	21.04644	21.31568	20.2692	20.6756
	22.225	21.04644	21.22424	20.2692	20.6756
	22.225	21.04644	21.18106	20.2692	20.49272
1-8UNC	25.4	23.33752	23.6728	21.971	22.606
	25.4	23.33752	23.56104	21.971	22.606
	25.4	23.33752	23.50516	21.971	22.34438
1-14UNF	25.4	24.22144	24.4983	23.4442	23.8252
	25.4	24.22144	24.40686	23.4442	23.8252
	25.4	24.22144	24.3586	23.4442	23.6601

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