Standard/Metric Wrench Chart

I thought you might find handy the enclosed standard/metric wrench conversion chart I ran across in Successful Farming magazine's "All Around the Farm" page. If your tool box is like mine, you have an assortment of wrenches, but invariably need a second one for the same bolt and don't have the extra standard or metric one of the same size.

Post this chart on your shop wall or tool box inner lid to help find a close wrench fit.

STANDARD / METRIC
WRENCH CONVERSION CHART

Bolt Size

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

5/8"

15/16

24 mm

3/4"

1 1/8

28 mm

7/8"

1 5/16

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1"

1 1/2

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Webpage maintained by:
Bob Schultheis
Natural Resource Engineering Specialist
Email comments to: schultheisr@missouri.edu
Last revised: 07/09/2009

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