Standard To Metric Wrench Conversion Chart
We all have a mix of wrenches in our tool boxes. Some of us have a lot of SAE, others have a full range of metric and most of us have a balanced mix of both.
Whatever your setup, our wrench conversion chart will tell you the best fitting standard or metric wrench to use for any given bolt.
Standard / Metric Wrench Conversion Chart
Bolt Diameter | Standard | Metric |
1/8" | 5/16" | 8mm |
3/16" | 3/8" | 10mm |
1/4" | 7/16" | 11mm |
5/16" | 1/2" | 13mm |
3/8" | 9/16" | 14mm |
7/16" | 5/8" | 16mm |
1/2" | 3/4" | 19mm |
9/16" | 13/16" | 21mm |
7/8" | 22mm | |
5/8" | 15/16" | 24mm |
1" | 25mm | |
3/4" | 1-1/8" | 29mm |
1-1/4" | 32mm | |
7/8" | 1-5/16" | 34mm |
1-3/8" | 35mm | |
1" | 1-1/2" | 38 mm |
1-5/8" | 41mm | |
1-1/8" | 1-11/16" | 43mm |
1-3/4" | 45mm | |
1-1/4" | 1-7/8" | 48mm |
1-3/8" | 2" | 51mm |
1-1/2" | 2-1/4" | 57mm |
1-5/8" | 2-1/2" | 64mm |
1-3/4" | 2-5/8" | 67mm |
2-3/4" | 70mm | |
1-7/8" | 2-15/16" | 75mm |
3" | 76mm | |
2" | 3-1/8" | 80mm |
3-1/4" | 83mm | |
2-1/4" | 3-1/2" | 89mm |
3-3/4" | 95mm | |
2-1/2" | 3-7/8" | 99mm |
4" | 102mm | |
2-3/4" | 4-1/4" | 108mm |
4-1/2" | 114mm | |
3" | 4-5/8" | 118mm |
3-1/4" | 5" | 127mm |
3-1/2" | 5-3/8" | 137mm |
5-1/2" | 140mm | |
3-3/4" | 5-3/4" | 146mm |
6" | 152mm | |
6-1/2" | 165mm | |
7" | 178mm |
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