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Conversion Chart

SAE AND WHITWORTH SIZES

SAE MM SAE MM WW MM WW MM
1/46.351.1/1626.991/166.90142.42
5/167.941.1/828.573/327.541.1/847.24
11/328.731.3/1630.161/88.641.1/452.07
3/89.521.1/431.753/1611.301.3/856.39
7/1611.111.5/1633.341/413.341.1/261.21
1/212.701.3/834.925/1615.241.5/865.35
9/1614.291.7/1636.513/818.031.3/470.10
19/3215.081.1/238.107/1620.831.7/876.70
5/815.881.9/1639.691/223.37
11/1617.461.5/841.289/1625.65
3/419.051.11/1642.865/827.94
25/3219.841.3/444.4511/1630.48
13/1620.641.13/1646.043/433.02
7/822.221.7/847.6313/1635.31
15/1623.81250.807/837.59
125.402.1/1652.39
  • SAE: SAE is the abbreviation of Society of Automotive Engineers (USA) 1/2 menas 1/2" distance across flats of bolts, screw heads & nuts.
  • MM: In Case of MM, the distance across flats is indicated in millimeters, 12 MM means 12 millimeters distance across flats of bolts, screw heads and nuts.
  • WW: WW is the abbreviation for whitworth (U.K.) and it indicated diameter of the bolt or screw 1/8 ww means diameter of bolts as 1/8 inch and does not indicate distance across flats.