底孔直径 mm
1.15 1.9 2.5 3.2 3.7 4.5 5.1 6.5 7.9 9.2 10.4 13.4 16.25 19.25 22 24.5 27.25 30.25 33.5 35.5 38.5 41.25 44.5 50 56 61.5 68 73.75 80 85.5 92 98 104.2 110 116.5 122.5 128.5
7.938 1.156
22
7.199 6.459
9.525
1.27
20
8.712 7.899
11.113 1.411
18
10.209 9.304
12.7
1.588
16
11.684 10.668
14.288 1.588
16
13.272 12.256
15.875 1.814
14
14.712 13.549
17.463 1.814
14
16.3 15.137
19.05 2.117
12
17.693 16.336
20.638 2.117
12
19.281 17.924
22.225 2.309
11
20.747 19.269
25.4
2.54
10
23.774 22.148
28.575 2.822
9
26.769 24.963
（2006-03-13 14:38:47 ）
每英寸牙 数
中径
tpi
mm
d2=D2
28
7.142
28
9.147
19
12.301
19
15.806
14
19.793
14
25.279
11
31.77
11
40.431
11
46.324
11
58.135
11
73.705
11
86.405
11 111.551
11 136.951
0.125 0.125 0.184 0.184 0.249 0.249 0.317 0.317 0.317 0.317 0.317 0.317 0.317 0.317 0.317
6.4 8.4 11.2 14.75 18.25 23.75 30 38.5 44.5 56 71 85.5 110.5 136 161.5
大径 mm d=D 1.587 2.381 3.175 3.969 4.762 5.556 6.35 7.938 9.525 11.113 12.7 15.876 19.051 22.226 25.4 28.576 31.751 34.926 38.1 41.277 44.452 47.627 50.802 57.152 63.502 69.853 76.203 82.553 88.903 95.254 101.604 107.954 114.304 120.665 127.005 133.355 139.705
1.058
24
4.878 4.201
1.27
20
5.537 4.724
1.411
18
7.034 6.131
1.588
16
8.509 7.492
1.814
14
9.951 8.789
2.117
12
11.345 9.99
2.309
11
14.397 12.918
2.54
10
17.424 15.798
2.822
6
54.44 51.73
63.5
4.234
6
60.79 58.08
69.85 4.234
6
67.14 64.43
76.2
5.08
5
72.946 69.692
82.55
5.08
5
79.296 76.042
88.9
5.645
4 1/2 85.285 81.67
95.25 5.645 4 1/2 91.635 88.02
5 3/4＂ 6＂
BSW BSW
146.055 152.406
10.16 10.16
2 1/2 2 1/2
139.549 133.043 6.506 145.9 139.394 6.506
134.5 141
英制普通螺纹 -- 细牙 -- BSF
名义尺寸 BSF
3/16 7/32 1/4 9/32 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 13/16 7/8 1.00 1 1/8 1 1/4 1 3/8 1 1/2 1 5/8 1 3/4
名义尺寸 Ww
1/16＂ 3/32＂ 1/8＂ 5/32＂ 3/16＂ 7/32＂ 1/4＂ 5/16＂ 3/8＂ 7/16＂ 1/2＂ 5/8＂ 3/4＂ 7/8＂
1＂ 1 1/8＂ 1 1/4＂ 1 3/8＂ 1 1/2＂ 1 5/8＂ 1 3/4＂ 1 7/8＂
2＂ 2 1/4＂ 2 1/2＂ 2 3/4＂
英制普通螺纹 (惠氏螺纹) -- 小螺纹系列 (BA)
大径
螺距
每英寸牙 数
中径
小径
mm
mm
tpi
mm
外螺纹
d=D
p
d2=D2
d3
1
0.23
110.4
0.86
0.72
1.2
0.25
101.6
1.05
0.9
1.3
0.28
90.71
1.13
0.96
1.5
0.31
81.93 1.315
1.13
1.7
0.35
英制普通螺纹 (惠氏螺纹) -- 细牙 (BSW)
大径
螺距
每英寸牙 数
中径
小径
mm
mm
tpi
mm
外螺纹
d=D
p
d2=D2
d3
4.763 0.794
32
4.255 3.747
5.556 0.907
28
4.975 4.394
6.35
0.977
26
5.725
5.1
7.142 0.977
26
6.518 5.893
2.95
0.44
3.4
0.485
3.9
0.54
4.4
0.6
5
55°圆锥管螺纹型式和尺寸
螺纹代号 R 1/16 R 1/8 R 1/4 R 3/8 R 1/2 R 3/4 R1 R 1 1/4 R 1 1/2 R2 R 2 1/2 R3 R4 R5 R6
基本尺寸 英寸
1/16＂ 1/8＂ 1/4＂ 3/8＂ 1/2＂ 3/4＂ 1＂ 1 1/4＂ 1 1/2＂ 2＂ 2 1/2＂ 3＂ 4＂ 5＂ 6＂
制惠氏螺纹的型式尺寸
英制普通螺纹 (惠氏螺纹) -- 粗牙 (BSW)
螺距
每英寸牙 数
中径
小径
mm
tpi
mm
外螺纹
p
d2=D2
d3
0.423
60
1.315
1.05
0.529
48
2.041 1.703
0.635
40
2.768 2.362
0.793
32
3.459 2.952
1.058
24
4.084 3.407
名义尺寸 BA
No. 14 No. 13 No. 12 No. 11 No. 10 No. 9 No. 8 No. 7 No. 6 No. 5 No. 4 No. 3 No. 2 No. 1 No. 0
牙型代号 BA BA BA BA BA BA BA BA BA BA BA BA BA BA BA
5.645 4 1/2 47.187 43.573
6.35
4
53.086 49.02
6.35
4
59.436 55.37
7.257 3 1/2 65.205 60.558
7.257 3 1/2 71.556 66.909
7.816 3 1/4 77.548 72.544
7.816 3 1/4 83.899 78.894
11 162.351
小径 外螺纹
d3 6.561 8.566 11.445 14.95 18.631 24.117 30.291 38.952 44.845 56.656 72.226 84.926 110.072 135.472 160.872
牙型高度 圆弧尺寸 底孔尺寸
H1
r
mm
0.581 0.581 0.856 0.856 1.162 1.162 1.479 1.479 1.479 1.479 1.479 1.479 1.479 1.479 1.479
101.6 5.645 4 1/2 97.985 94.37
107.95 6.35
4
103.886 99.822
牙型高 底孔直径
H1
mm
0.508 0.581 0.625 0.625 0.739 0.813 0.904 1.017 1.017 1.162 1.162 1.355 1.355 1.479 1.627 1.807 1.807 2.033 2.033 2.033 2.324 2.324 2.711 2.711 2.711 3.253 3.253 3.614 3.614 3.614 4.066
2 2 1/4 2 1/2 2 3/4
3 3 1/4 3 1/2 3 3/4
4 4 1/4
牙型代号 BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF BSF