SOL Spanner Specs - Sockets & Wrenches

Key to Nut & Bolt Sizes

BA = British Association BSF = British Standard Fine BSW = British Standard Whitworth
mm = Metric (milimeters) UNF = United Fine (or AF - American Fine) UNC = United Course

  nut size across flats                   British sizes
  -----------------------------           --------------------
  decimal inch     mm   UNF inch          BA      BSF      BSW
      .250         .      1/4      .       .       .        .
      .276         7       .       .       .       .        .
      .282         .       .       .       3       .        .
      .313         .      5/16     .       .       .        .
      .315         8       .       .       .       .        .
      .324         .       .       .       2       .        .
      .340         .       .       .       .      3/16     1/8
      .344         .     11/32     .       .       .        .
      .354         9       .       .       .       .        .
      .365         .       .       .       1       .        .
      .375         .      3/8      .       .       .        .
      .394        10       .       .       .       .        .
      .412         .       .       .       0       .        .
      .433        11       .       .       .       .        .
      .438         .      7/16     .       .       .        .
      .445         .       .       .       .      1/4      3/16
      .472        12       .       .       .       .        .
      .500         .      1/2      .       .       .        .
      .512        13       .       .       .       .        .
      .525         .       .       .       .      5/16     1/4
      .551        14       .       .       .       .        .
      .563         .      9/16     .       .       .        .
      .591        15       .       .       .       .        .
      .600         .       .       .       .      3/8      5/16
      .625         .      5/8      .       .       .        .
      .630        16       .       .       .       .        .
      .669        17       .       .       .       .        .
      .688         .     11/16     .       .       .        .
      .709        18       .       .       .       .        .
      .710         .       .       .       .      7/16     3/8
      .748        19       .       .       .       .        .
      .750         .      3/4      .       .       .        .
      .787        20       .       .       .       .        .
      .813         .     13/16     .       .       .        .
      .820         .       .       .       .      1/2      7/16
      .866        22       .       .       .       .        .
      .875         .      7/8      .       .       .        .
      .920         .       .       .       .      9/16     1/2
      .938         .     15/16     .       .       .        .
      .945        24       .       .       .       .        .
     1.000         .       1       .       .       .        .

1996 Team.Net

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