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Useful Spanner Sizes
Inches 

Millimetres 

 Spanner 
0.250    1/4 AF 
0.276  7mm  7mm 
0.313    5/16 AF 
0.315  8mm  8mm 
0.344    11/32 AF, 1/8 BSW 
0.354  9mm  9mm 
0.375    3/8 AF 
0.394  10mm  10mm 
0.433  11mm  11mm 
0.438    7/16 AF 
0.445    3/16 BSW, 1/4 AF
0.472  12mm  12mm 
0.500    1/2 AF 
0.512  13mm  13mm 
0.525    1/4 BSW, 5/16 BSF 
0.551  14mm  14mm 
0.563    9/16 AF 
0.591  15mm  15mm 
0.600    5/16 BSW, 3/8 BSF 
0.625    5/8 AF 
0.630  16mm  16mm 
0.669  17mm  17mm 
0.686    11/16 AF 
0.709  18mm  18mm 
0.710    3/8 BSW, 7/16 BSF 
0.748  19mm  19mm 
0.750    3/4 AF 
0.787  20mm  20mm 
0.813    13/16 AF 
0.820    7/16 BSW, 1/2 BSF 
0.826  21mm  21mm 
0.866  22mm  22mm 
0.875    7/8 AF 
0.905  23mm  23mm 
0.920    1/2 BSW, 9/16 BSF 
0.938    15/16 AF 
0.945  24mm  24mm 
0.984  25mm  25mm 
1.000    1in AF 
1.010    9/16 BSW, 5/8 BSF 
1.024  26mm 26mm 
1.063  27mm  1 1/16 AF, 27mm 
1.100    5/16 BSW, 11/16 BSF 
1.125    1 1/8 AF 
1.181  30mm  30mm 
1.200    11/16 BSW, 3/4 BSF 
1.250    1 1/4 AF 
1.260  32mm  32mm 
1.300    3/4 BSW, 7/8 BSF 
1.313    1 5/16 AF 
1.390    13/16 BSW, 15/16 BSF 
1.417  36mm  36mm 
1.418    1 7/16 AF 
1.480    7/8 BSW, 1in BSF 
1.500    1 1/2 AF 
1.575  40mm  15/16 AF, 40mm
 
Copyright  © 2011 Cedric Norman - This site is provided for your information and while every effort has been made to ensure accuracy, the owner can not be held responsible for any discrepancy or inaccurate information. Please let me know if you find links that no longer work or you have another view of an issue.