download Wrench Conversion Chart Wrench Spanners - Inches vs. mm Standard SAE U.S. Wrench/Spanner Size (inches)Metric Wrench/Spanner Size (mm) 1/8 3.18 5/32 3.97 4 3/16 4.76 5 13/64 5.16 7/32 5.56 15/64 6.05 6 1/4 6.35 17/64 6.75 7 9/32 7.14 5/16 7.94 8 11/32 8.73 ...