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英、美制紧固件螺纹 |
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英寸制螺纹包括惠氏螺纹（Whitworth thread）和统一标准螺纹（Unified thread）。 |
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惠氏螺纹是英国英寸制规格紧固件用普通螺纹，其牙型角为55°，习惯用公称直径（单位为英寸inch）及每英寸牙数来表示，尺寸单位采用符号“ ” ”。例如：1/2”-12BSW表示公称直径为1/2”的粗牙惠氏螺纹。 |
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统一标准螺纹是美国英寸制规格紧固件用普通螺纹，其牙型角为60°，一般用号码（公称直径﹤1/4”）或公称直径的英寸分数（≥1/4”）、每英寸牙数和代号（UNC、UNF）来表示。例如：1/2”-13UNC表示公称直径为1/2”的粗牙统一标准螺纹。 |
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惠氏螺纹和统一标准螺纹公称直径与每英寸牙数 |
| 螺纹大径 |
螺纹大径 |
统一标准螺纹ANSI B1.1-182 |
惠氏螺纹BS84-1956 |
| mm |
inch |
尺寸代号 |
粗牙UNC |
细牙UNF |
尺寸代号 |
粗牙BSW |
细牙BSF |
| 1.52 |
0.06 |
0# |
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80 |
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| 1.59 |
0.0625 |
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1/16 |
60 |
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| 1.85 |
0.073 |
1# |
64 |
72 |
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| 2.18 |
0.086 |
2# |
56 |
64 |
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| 2.38 |
0.0938 |
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3/32 |
48 |
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| 2.51 |
0.099 |
3# |
48 |
56 |
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| 2.84 |
0.112 |
4# |
40 |
48 |
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| 3.18 |
0.125 |
5# |
40 |
44 |
1/8 |
40 |
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| 3.51 |
0.138 |
6# |
32 |
40 |
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| 3.97 |
0.1563 |
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5/32 |
32 |
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| 4.17 |
0.164 |
8# |
32 |
36 |
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| 4.76 |
0.1875 |
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3/16 |
24 |
32 |
| 4.83 |
0.19 |
10# |
24 |
32 |
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| 5.49 |
0.216 |
12# |
24 |
28 |
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| 5.56 |
0.2189 |
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7/32 |
24 |
28 |
| 6.35 |
0.25 |
1/4 |
20 |
28 |
1/4 |
20 |
26 |
| 7.94 |
0.3125 |
5/16 |
18 |
24 |
5/16 |
18 |
22 |
| 9.53 |
0.375 |
3/8 |
16 |
24 |
3/8 |
16 |
20 |
| 11.11 |
0.4375 |
7/16 |
14 |
20 |
7/16 |
14 |
18 |
| 12.70 |
0.5 |
1/2 |
13 |
20 |
1/2 |
12 |
16 |
| 14.29 |
0.5625 |
9/16 |
12 |
18 |
9/16 |
12 |
16 |
| 15.88 |
0.625 |
5/8 |
11 |
18 |
5/8 |
11 |
14 |
| 17.46 |
0.6875 |
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11/16 |
11 |
14 |
| 19.05 |
0.75 |
3/4 |
10 |
16 |
3/4 |
10 |
12 |
| 22.23 |
0.875 |
7/8 |
9 |
14 |
7/8 |
9 |
11 |
| 25.40 |
1 |
1 |
8 |
12 |
1 |
8 |
10 |
| 28.58 |
1.125 |
1-1/8 |
7 |
12 |
1-1/8 |
7 |
9 |
| 31.75 |
1.25 |
1-1/4 |
7 |
12 |
1-1/4 |
7 |
9 |
| 34.93 |
1.375 |
1-3/8 |
6 |
12 |
1-3/8 |
|
8 |
| 38.10 |
1.5 |
1-1/2 |
6 |
12 |
1-1/2 |
6 |
8 |
| 41.28 |
1.625 |
1-5/8 |
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1-5/8 |
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8 |
| 44.45 |
1.75 |
1-3/4 |
5 |
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1-3/4 |
5 |
7 |
| 50.80 |
2 |
2 |
4.5 |
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2 |
4.5 |
7 |
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备注：各种英、美制螺纹代号说明 |
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BA-British Association |
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BSW-British Standard Whitworth |
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BSF-British Standard Fine |
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BSP-British Standard Pipe |
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BSPT-British Standard Pipe Tapered |
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BSC-British Standard Cycle |
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UNC-Unified National Course |
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UNF-Unified National Fine |
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UNEF-Unified National Extra Fine |
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UNM-Unified National Miniature |
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NPT-National Pipe Tapered |
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