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Standard-metric Wrench
Conversion Chart
Bolt Diameter Standard Metric
1/8" 5/16" 8 mm
3/16" 3/8" 10 mm
1/4" 7/16" 11 mm
5/16" 1/2" 13 mm
3/8" 9/16" 14 mm
7/16" 5/8" 16 mm
1/2" 3/4" 19 mm
9/16" 13/16" 21 mm
  7/8" 22 mm
5/8" 15/16" 24 mm
  1" 25 mm
3/4" 1-1/8" 29 mm
  1-1/4" 32 mm
7/8" 1-5/16" 34 mm
  1-3/8" 35 mm
1" 1-1/2" 38 mm
  1-5/8" 41 mm
1-1/8" 1-11/16" 43 mm
  1-3/4" 45 mm
1-1/4" 1-7/8" 48 mm
1-3/8" 2" 51 mm
1-1/2" 2-1/4" 57 mm
1-5/8" 2-1/2" 64 mm
1-3/4" 2-5/8" 67 mm
  2-3/4" 70 mm
1-7/8" 2-15/16" 75 mm
  3" 76 mm
2" 3-1/8" 80 mm
  3-1/4" 83 mm
2-1/4" 3-1/2" 89 mm
  3-3/4" 95 mm
2-1/2" 3-7/8" 99 mm
  4" 102 mm
2-3/4" 4-1/4" 108 mm
  4-1/2" 114 mm
3" 4-5/8" 118 mm
3-1/4" 5" 127 mm
3-1/2" 5-3/8" 137 mm
  5-1/2" 140 mm
3-3/4" 5-3/4" 146 mm
  6" 152 mm
  6-1/2" 165 mm
  7" 178 mm