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公美制統一標準螺紋牙數表
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公制螺紋牙距表
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美制 統一標準螺紋牙數表
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公稱直徑
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牙距 mm
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公稱直徑
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直徑尺寸
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牙距＝每英寸牙數
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毫米
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粗牙
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細牙
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自攻牙
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號＜ 1/4"
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英寸 in
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毫米 mm
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粗牙 UNC
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細牙 UNF
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自攻牙
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M1
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0.25
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0.2
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72T
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0#
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0.06
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1.524
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-
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80
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|
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M1.2
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0.25
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0.2
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56T
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1#
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0.073
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1.854
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64
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72
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|
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M1.6
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0.35
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0.2
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48T
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2#
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0.086
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2.184
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56
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64
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32T
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|
M2
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0.4
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0.25
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40T
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3#
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0.099
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2.515
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48
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56
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|
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M2.5
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0.45
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0.35
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28T
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4#
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0.112
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2.845
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40
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48
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24T
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M3
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0.5
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0.35
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24T
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5#
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0.125
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3.175
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40
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44
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|
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M4
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0.7
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0.5
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19T
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6#
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0.138
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3.505
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32
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40
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20T
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M5
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0.8
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0.5
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16T
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8#
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0.164
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4.166
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32
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36
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18T
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M6
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1
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0.75
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14T
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10#
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0.19
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4.826
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24
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32
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16T
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M8
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1.25
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1
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12T
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12#
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0.216
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5.486
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24
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28
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14T
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M10
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1.5
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1.25
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1/4"
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0.25
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6.350
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20
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28
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14T
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M12
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1.75
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1.25
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5/16"
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0.3125
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7.938
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18
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24
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12T
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M14
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2
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1.5
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3/8"
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0.375
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9.525
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16
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24
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|
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M16
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2
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1.5
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7/16"
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0.4375
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11.113
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14
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20
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|
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M18
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2.5
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1.5
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1/2"
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0.5
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12.700
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13
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20
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|
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M20
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2.5
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1.5
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9/16"
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0.5625
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14.288
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12
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18
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M22
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2.5
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1.5
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5/8"
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0.625
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15.875
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11
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18
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M24
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3
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2
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3/4"
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0.75
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19.050
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10
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16
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M27
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3
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2
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7/8"
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0.875
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22.225
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9
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14
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|
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M30
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3.5
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2
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1"
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1
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25.400
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8
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12
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|
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(M33)
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3.5
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2
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1-1/8"
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1.125
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28.575
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7
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12
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|
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M36
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4
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3
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1-1/4"
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1.25
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31.750
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7
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12
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(M39)
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4
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3
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1-3/8"
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1.375
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34.925
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6
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12
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M42
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4.5
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3
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1-1/2"
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1.5
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38.100
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6
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12
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(M45)
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4.5
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3
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1-3/4"
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1.75
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44.450
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5
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-
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|
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M48
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5
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3
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2"
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2
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50.800
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4.5
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-
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注：標準牙為粗牙