Tech Tips
SAE Wrench & Drill Sizes

If you don't make your living with your tools, and you didn't major in math, maybe you too have trouble with SAE wrench and drill sizes. Metric is a no brainer....if you reach for a 10mm and it's too small try an 11mm. But for me it never fails, I spend half my "labor" time looking for the right wrench size. I created this chart and taped one on my toolbox and I have one in my wallet. It reads left to right for sequential fraction sizes.

1/16

3/32

1/8

5/32

3/16

7/32

1/4

9/32

5/16

11/32

3/8

13/32

7/16

15/32

1/2

17/32

9/16

19/32

5/8

21/32

11/16

23/32

3/4

25/32

13/16

27/32

7/8

29/32

15/16

31/32

1"

 


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