英寸制螺紋包括惠氏螺紋（Whitworth thread）和統(tǒng)一標(biāo)準(zhǔn)螺紋（Unified thread）。
惠氏螺紋是英國英寸制規(guī)格緊固件用普通螺紋，其牙型角為55°，習(xí)慣用公稱直徑（單位為英寸inch）及每英寸牙數(shù)來表示，尺寸單位采用符號“ ” ”。例如：1/2”-12BSW表示公稱直徑為1/2”的粗牙惠氏螺紋。
統(tǒng)一標(biāo)準(zhǔn)螺紋是美國英寸制規(guī)格緊固件用普通螺紋，其牙型角為60°，一般用號碼（公稱直徑﹤1/4”）或公稱直徑的英寸分?jǐn)?shù)（≥1/4”）、每英寸牙數(shù)和代號（UNC、UNF）來表示。例如：1/2”-13UNC表示公稱直徑為1/2”的粗牙統(tǒng)一標(biāo)準(zhǔn)螺紋。 |
惠氏螺紋和統(tǒng)一標(biāo)準(zhǔn)螺紋公稱直徑與每英寸牙數(shù) |
螺紋大徑 |
統(tǒng)一標(biāo)準(zhǔn)螺紋ANSI
B1.1-182 |
惠氏螺紋BS84-1956 |
inch |
尺寸代號 |
粗牙UNC |
細(xì)牙UNF |
尺寸代號 |
粗牙BSW |
細(xì)牙BSF |
0.0600 |
0# |
|
80 |
|
|
|
0.0625 |
|
|
|
1/16 |
60 |
|
0.0730 |
1# |
64 |
72 |
|
|
|
0.0860 |
2# |
56 |
64 |
|
|
|
0.0938 |
|
|
|
3/32 |
48 |
|
0.0990 |
3# |
48 |
56 |
|
|
|
0.1120 |
4# |
40 |
48 |
|
|
|
0.1250 |
5# |
40 |
44 |
1/8 |
40 |
|
0.1380 |
6# |
32 |
40 |
|
|
|
0.1563 |
|
|
|
5/32 |
32 |
|
0.1640 |
8# |
32 |
36 |
|
|
|
0.1875 |
|
|
|
3/16 |
24 |
32 |
0.1900 |
10# |
24 |
32 |
|
|
|
0.2160 |
12# |
24 |
28 |
|
|
|
0.2189 |
|
|
|
7/32 |
24 |
28 |
0.2500 |
1/4 |
20 |
28 |
1/4 |
20 |
26 |
0.2812 |
|
|
|
9/32 |
|
26 |
0.3125 |
5/16 |
18 |
24 |
5/16 |
18 |
22 |
0.3750 |
3/8 |
16 |
24 |
> 3/8 |
16 |
20 |
0.4375 |
7/16 |
14 |
20 |
7/16 |
14 |
18 |
0.5000 |
1/2 |
13 |
20 |
1/2 |
12 |
16 |
0.5625 |
9/16 |
12 |
18 |
9/16 |
12 |
16 |
0.6250 |
5/8 |
11 |
18 |
5/8 |
11 |
14 |
0.6875 |
|
|
|
11/16 |
11 |
14 |
0.7500 |
3/4 |
10 |
16 |
3/4 |
10 |
12 |
0.8125 |
|
|
|
13/16 |
|
12 |
0.8750 |
7/8 |
9 |
14 |
7/8 |
9 |
11 |
1.0000 |
1 |
8 |
12 |
1 |
8 |
10 |
1.1250 |
1-1/8 |
7 |
12 |
1-1/8 |
7 |
9 |
1.2500 |
1-1/4 |
7 |
12 |
1-1/4 |
7 |
9 |
1.3750 |
1-3/8 |
6 |
12 |
1-3/8 |
|
8 |
1.5000 |
1-1/2 |
6 |
12 |
1-1/2 |
6 |
8 |
1.6250 |
1-5/8 |
|
|
1-5/8 |
|
8 |
1.7500 |
1-3/4 |
5 |
|
1-3/4 |
5 |
7 |
2.0000 |
2 |
4.5 |
|
2 |
4.5 |
7 |
2.2500 |
2-1/4 |
4.5 |
|
|
|
|
2.5000 |
2-1/2 |
4 |
|
|
|
|
2.7500 |
2-3/4 |
4 |
|
|
|
|
3.0000 |
3 |
4 |
|
|
|
|
3.2500 |
3-1/4 |
4 |
|
|
|
|
3.5000 |
3-1/2 |
4 |
|
|
|
|
3.7500 |
3-3/4 |
4 |
|
|
|
|
4.0000 |
4 |
4 |
|
|
|
|
|
|
|
|
|
|
|
| 備注：各種英、美制螺紋代號說明 |
|
BA-British Association |
|
BSW-British Standard Whitworth |
| BSF-British Standard
Fine |
|
BSP-British Standard
Pipe |
|
BSPT-British Standard Pipe Tapered |
|
BSC-British Standard Cycle |
|
UNC-Unified National
Course |
|
UNF-Unified National Fine |
|
UNEF-Unified National Extra Fine |
|
UNM-Unified National Miniature |
|
NPT-National Pipe Tapered |
