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英、美制緊固件螺紋
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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(guó)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(hào)“ ” ”。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(guó)英寸制規(guī)格緊固件用普通螺紋，其牙型角為60°，一般用號(hào)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(hào)（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。
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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)
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螺紋大徑
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統(tǒng)一標(biāo)準(zhǔn)螺紋ANSI B1.1-182
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惠氏螺紋BS84-1956
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inch
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尺寸代號(hào)
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粗牙UNC
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細(xì)牙UNF
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尺寸代號(hào)
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粗牙BSW
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細(xì)牙BSF
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0.0600
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0#
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80
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0.0625
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1/16
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60
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0.0730
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1#
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64
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72
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0.0860
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2#
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56
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64
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0.0938
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3/32
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48
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0.0990
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3#
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48
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56
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0.1120
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4#
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40
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48
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0.1250
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5#
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40
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44
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1/8
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40
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0.1380
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6#
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32
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40
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0.1563
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5/32
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32
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0.1640
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8#
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32
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36
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0.1875
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3/16
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24
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32
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0.1900
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10#
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24
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32
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0.2160
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12#
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24
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28
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0.2189
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7/32
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24
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28
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0.2500
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1/4
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20
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28
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1/4
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20
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26
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0.2812
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9/32
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26
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0.3125
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5/16
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18
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24
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5/16
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18
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22
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0.3750
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3/8
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16
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24
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3/8
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16
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20
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0.4375
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7/16
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14
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20
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7/16
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14
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18
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0.5000
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1/2
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13
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20
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1/2
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12
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16
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0.5625
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9/16
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12
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18
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9/16
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12
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16
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0.6250
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5/8
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11
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18
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5/8
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11
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14
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0.6875
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11/16
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11
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14
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0.7500
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3/4
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10
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16
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3/4
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10
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12
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0.8125
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13/16
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12
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0.8750
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7/8
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9
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14
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7/8
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9
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11
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1.0000
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1
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8
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12
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1
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8
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10
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1.1250
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1-1/8
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7
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12
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1-1/8
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7
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9
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1.2500
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1-1/4
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7
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12
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1-1/4
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7
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9
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1.3750
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1-3/8
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6
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12
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1-3/8
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8
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1.5000
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1-1/2
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6
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12
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1-1/2
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6
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8
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1.6250
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1-5/8
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1-5/8
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8
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1.7500
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1-3/4
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5
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1-3/4
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5
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7
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2.0000
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2
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4.5
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2
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4.5
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7
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2.2500
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2-1/4
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4.5
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2.5000
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2-1/2
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4
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2.7500
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2-3/4
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4
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3.0000
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3
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4
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3.2500
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3-1/4
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4
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3.5000
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3-1/2
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4
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3.7500
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3-3/4
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4
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4.0000
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4
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4
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備注：各種英、美制螺紋代號(hào)說明
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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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