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螺纹基本尺寸对照表

英制管螺纹基本尺寸及公差（牙形角55º） BSPP

螺纹代号	基本直径			内螺纹		外螺纹
	大径	中径	小径	中径公差	小径公差	A级		B级
	大径	中径	小径	中径公差	小径公差	中径公差	大径公差	中径公差	大径公差
G1/8″×28	9.728	9.147	8.566	+0.170	+0.282 0	0 -0.107	0 -0.214	0 -0.214	0 -0.214
G1/4″×19	13.157	12.301	11.445	+0.125	+0.445	-0.125	-0.250	-0.250	0-0.250
G3/8″×19	16.662	15.806	14.950	+0.125 0	+0.445 0	0 -0.125	0 -0.250	0 -0.250	0 -0.250
G1/2″×14	20.955	19.793	18.631	+0.142 0	+0.541 0	0 -0.142	0 -0.284	0 -0.284	0 -0.284
G5/8″×14	22.911	21.749	20.587	+0.142 0	+0.541 0	0 -0.142	0 -0.284	0 -0.284	0 -0.284
G3/4″×14	26.441	25.279	24.117	+0.142 0	+0.541 0	0 -0.142	0 -0.284	0 -0.284	0 -0.284
G1″×11	33.249	31.770	30.291	+0.180 0	+0.640 0	0 -0.180	0 -0.360	0 -0.360	0 -0.360
G1.1/4″×11	41.910	40.431	38.952	+0.180 0	+0.640 0	0 -0.180	0 -0.360	0 -0.360	0 -0.360
G1.1/2″×11	47.803	46.324	44.854	+0.180 0	+0.640 0	0 -0.180	0 -0.360	0 -0.360	0 -0.360
G2″×11	59.614	58.135	56.656	+0.180 0	+0.640 0	0 -0.180	0 -0.360	0 -0.360	0 -0.360
G2.1/2”X11	75.184	73.705	72.226	+0.217 0	+0.640 0	0 -0.217	0 -0.434	0 -0.434	0 -0.434
G3”X11	87.884	86.405	84.926	+0.217 0	+0.640 0	0 -0.217	0 -0.434	0 -0.434	0 -0.434
G3.1/2”X11	100.330	98.851	97.372	+0.217 0	+0.640 0	0 -0.217	0 -0.434	0 -0.434	0 -0.434

英制锥管螺纹基本尺寸及公差（牙形角55º） BSPT

螺纹代号	基面上的直径			基准长度			有效螺纹长度			圆锥内螺纹基面轴向位移偏差（±mm）
螺纹代号	大径	中径	小径	基本	最大	最小	基本	最大	最小	圆锥内螺纹基面轴向位移偏差（±mm）
R1/8″×28	9.728	9.147	8.566	4.0	4.9	3.1	6.5	7.4	5.6	1.1
R1/4″×19	13.157	12.301	11.445	6.0	7.3	4.7	9.7	11.0	8.4	1.7
R3/8″×19	16.662	15.806	14.950	6.4	7.7	5.1	10.1	11.4	8.8	1.7
R1/2″×14	20.955	19.793	18.631	8.2	10.0	6.4	13.2	15.0	11.4	2.3
R3/4″×14	26.441	25.279	24.117	9.5	11.3	7.7	14.5	16.3	12.7	2.3
R1″×11	33.249	31.770	30.291	10.4	12.7	8.1	16.8	19.1	14.5	2.9
R1.1/4″×11	41.910	40.431	38.952	12.7	15.0	10.4	19.1	21.4	16.8	2.9
R1.1/2″×11	47.803	46.324	44.845	12.7	15.0	10.4	19.1	21.4	16.8	2.9
R2″×11	59.614	58.135	56.656	15.9	18.2	13.6	23.4	25.7	21.1	2.9
R2.1/2”X11	75.184	73.705	72.226	17.5	21.0	14.0	26.7	30.2	23.2	3.5
R3”X11	87.884	86.405	84.926	20.6	24.1	17.1	29.8	33.3	26.3	3.5
R3.1/2”X11	100.330	98.851	97.372	22.2	25.7	18.7	31.4	34.9	27.9	3.5

美制管螺纹基本尺寸及公差（牙形角60º） UN(F)

螺纹代号	外螺纹					内螺纹
	公差等级					公差等级
	2A					2B
	大径		中径		小径	小径		中径		大径
	最大	最小	最大	最小		最小	最大	最小	最大
JIC螺纹
7/16″×20UNF	11.079	10.874	10.254	10.147	9.568	9.728	10.033	10.287	10.424	11.113
1/2″×20UNF	12.667	12.461	11.841	11.732	11.156	11.328	11.608	11.875	12.017	12.7
9/16″×18UNF	14.252	14.031	13.335	13.221	12.573	12.751	13.081	13.371	13.52	14.288
3/4″×16UNF	19.012	18.773	17.981	17.854	17.12	17.323	17.678	18.019	18.184	19.05
7/8″×14UNF	22.184	21.923	21.006	20.869	20.025	20.269	20.676	21.046	21.224	22.225
1-1/16″×12UN	26.944	26.655	25.57	25.425	24.425	24.689	25.146	25.613	25.801	26.988
1-5/16″×12UN	33.294	33.005	31.92	31.773	30.775	31.039	31.496	31.963	32.154	33.338
1-5/8″×12UN	41.229	40.94	39.885	39.705	38.71	38.989	39.446	39.901	40.094	41.275
1-7/8″×12UN	47.579	47.29	46.205	46.053	45.06	45.339	45.796	46.251	46.449	47.625
2-1/2″×12UN	63.452	63.162	62.078	61.92	60.932	61.214	61.671	62.126	62.332	63.5
ORFS螺纹
9/16″×18UNF	14.252	14.031	13.335	13.221	12.573	12.751	13.081	13.371	13.52	14.288
11/16″×16UN	17.427	17.188	16.396	16.274	15.535	15.748	16.104	16.431	16.589	17.463
13/16″×16UN	20.599	20.361	19.568	19.444	18.707	18.923	19.279	19.606	19.766	20.638
1″×14UNF	25.357	25.095	24.178	24.036	23.195	23.444	23.825	24.221	24.407	25.4
1-3/16″×12UN	30.119	29.83	28.745	28.598	27.6	27.864	28.321	28.788	28.979	30.163
1-7/16″×12UN	36.467	36.177	35.093	34.943	33.947	34.214	34.671	35.138	35.331	36.513
1-11/16″×12UN	42.817	42.527	41.443	41.29	40.297	40.564	41.021	41.488	41.686	42.863
2″×12UN	50.754	50.465	49.38	49.225	48.235	48.514	48.971	49.426	49.627	50.8
SAE螺纹
5/8″×18UNF	15.839	15.618	14.923	14.803	14.161	14.351	14.681	14.958	15.11	15.875
1-1/16″×14UN	26.947	26.683	25.743	25.608	24.74	24.968	25.375	25.783	25.961	26.987
其它美制螺纹
9/16″×16UN	14.252	14.013	13.221	13.101	12.36	12.573	12.929	13.256	13.411	14.288
7/8″×12UN	22.182	21.892	20.808	20.668	19.662	19.939	20.396	20.851	21.034	22.225
2-1/4″×12UN	57.104	56.815	55.73	55.575	54.585	54.864	55.321	55.776	55.976	57.15
注：UNC粗牙螺纹系列，UNF细牙螺纹系列， UNEF超细牙螺纹系列， UN不变螺距系列

布锥管螺纹基本尺寸及公差(牙形角60º) NPT

螺纹代号	基面上的直径			螺纹长度
螺纹代号	大径	中径	小径	有效长度	管端至基面长
Z1/8″×27	10.272	9.519	8.766	7	4.572
Z1/4″×18	13.572	12.443	11.314	9.5	5.080
Z3/8″×18	17.055	15.926	14.797	10.5	6.096
Z1/2″×14	21.223	19.772	18.321	13.5	8.028
Z3/4″×14	26.568	25.117	23.666	14	8.611
Z1″×11.5	33.228	31.461	29.694	17.5	10.160
Z1.1/4″×11.5	41.985	40.218	38.451	18	10.688
Z1.1/2″×11.5	48.054	46.287	44.520	18.5	10.688
Z2″×11.5	60.092	58.325	56.558	19	11.074

公制螺纹基本尺寸及公差(牙形角60º) M

螺纹代号

基本直径

内螺纹

外螺纹

大径

中径

小径

公差等级

公差等级

6H

7H

6g

中径公差

小径公差

中径公差

小径公差

中径公差

大径公差

M10X1

10

9.350

8.917

+0.150

0

+0.236

0

+0.190

0

+0.300

0

-0.026

-0.138

-0.026

-0.206

M12X1

12

11.350

10.917

+0.160

0

+0.236

0

+0.200

0

+0.300

0

-0.026

-0.144

-0.026

-0.206

M14X1

14

13.350

12.917

+0.160

0

+0.236

0

+0.200

0

+0.300

0

-0.026

-0.144

-0.026

-0.206

M12X1.25

12

11.188

10.647

+0.180

0

+0.265

0

+0.224

0

+0.335

0

-0.028

-0.160

-0.028

-0.240

M14X1.25

14

13.188

12.647

+0.180

0

+0.265

0

+0.224

0

+0.335

0

-0.028

-0.160

-0.028

-0.240

M12X1.5

12

11.026

10.376

+0.190

0

+0.300

0

+0.236

0

+0.375

0

-0.032

-0.172

-0.032

-0.268

M14X1.5

14

13.026

12.376

+0.190

0

+0.300

0

+0.236

0

+0.375

0

-0.032

-0.172

-0.032

-0.268

M16X1.5

16

15.026

14.376

+0.190

0

+0.300

0

+0.236

0

+0.375

0

-0.032

-0.172

-0.032

-0.268

M18X1.5

18

17.026

16.373

+0.190

0

+0.300

0

+0.236

0

+0.375

0

-0.032

-0.172

-0.032

-0.268

M20X1.5

20

19.026

18.376

+0.190

0

+0.300

0

+0.236

0

+0.375

0

-0.032

-0.172

-0.032

-0.268

M22X1.5

22

21.026

20.376

+0.190

0

+0.300

0

+0.236

0

+0.375

0

-0.032

-0.172

-0.032

-0.268

M24X1.5

24

23.026

22.376

+0.200

0

+0.300

0

+0.250

0

+0.375

0

-0.032

-0.182

-0.032

-0.268

M26X1.5

26

25.026

24.376

+0.200

0

+0.300

0

+0.250

0

+0.375

0

-0.032

-0.182

-0.032

-0.268

M27X1.5

27

26.026

25.376

+0.200

0

+0.300

0

+0.250

0

+0.375

0

-0.032

-0.182

-0.032

-0.268

M30X1.5

30

29.026

28.376

+0.200

0

+0.300

0

+0.250

0

+0.375

0

-0.032

-0.182

-0.032

-0.268

M33X1.5

33

32.026

31.376

+0.200

0

+0.300

0

+0.250

0

+0.375

0

-0.032

-0.182

-0.032

-0.268

M36X1.5

36

35.026

34.376

+0.200

0

+0.300

0

+0.250

0

+0.375

0

-0.032

-0.182

-0.032

-0.268

M39X1.5

39

38.026

37.376

+0.200

0

+0.300

0

+0.250

0

+0.375

0

-0.032

-0.182

-0.032

-0.268

M42X1.5

42

41.026

40.376

+0.200

0

+0.300

0

+0.250

0

+0.375

0

-0.032

-0.182

-0.032

-0.268

M27X2

27

25.701

24.835

+0.224

0

+0.375

0

+0.280

0

+0.475

0

-0.038

-0.208

-0.038

-0.318

M30X2

30

28.701

27.835

+0.224

0

+0.375

0

+0.280

0

+0.475

0

-0.038

-0.208

-0.038

-0.318

M33X2

33

31.701

30.835

+0.224

0

+0.375

0

+0.280

0

+0.475

0

-0.038

-0.208

-0.038

-0.318

M36X2

36

34.701

33.835

+0.224

0

+0.375

0

+0.280

0

+0.475

0

-0.038

-0.208

-0.038

-0.318

M39X2

39

37.701

36.835

+0.224

0

+0.375

0

+0.280

0

+0.475

0

-0.038

-0.208

-0.038

-0.318

M42X2

42

40.701

39.835

+0.224

0

+0.375

0

+0.280

0

+0.475

0

-0.038

-0.208

-0.038

-0.318

M45X2

45

43.701

42.835

+0.224

0

+0.375

0

+0.280

0

+0.475

0

-0.038

-0.208

-0.038

-0.318

M52X2

52

50.701

49.835

+0.236

0

+0.375

0

+0.300

0

+0.475

0

-0.038

-0.218

-0.038

-0.318

M60X2

60

58.701

57.835

+0.236

0

+0.375

0

+0.300

0

+0.475

0

-0.038

-0.218

-0.038

-0.318

M64X2

64

62.701

61.835

+0.236

0

+0.375

0

+0.300

0

+0.475

0

-0.038

-0.218

-0.038

-0.318

M72X2

72

70.701

69.835

+0.236

0

+0.375

0

+0.300

0

+0.475

0

-0.038

-0.218

-0.038

-0.318

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