英、美制紧固件螺纹
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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）。
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。 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
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螺纹大径
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统一标准螺纹ANSI B1.1-182
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惠氏螺纹BS84-1956
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inch
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尺寸代号
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粗牙UNC
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细牙UNF
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尺寸代号
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粗牙BSW
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细牙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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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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