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Wrench Sizes

Wrench Conversion

Size Equivalence Chart
by Vaughn Aubuchon

This wrench size conversion chart converts metric-sized wrenches to standard-sized wrenches, and shows which wrenches are roughly equivalent (interchangeable).
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Metric wrench sizes are shown, along with their "English Standard" equivalence, in 1/1000s of an inch. "Standard-size" wrenches refers to SAE sizes - the Society of Automotive Engineers.

Conversion Factors
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     Wrench Conversion Table
     Equivalent Sizes

Differ-ence in 1/1000s of an inch
Size
in
Inches
Stan-dard
SAE
Wrench Size (inches)
Metric Wrench Size (mm)

Compares Standard and Metric wrench sizes (where they CLOSELY match, and where they don't - wrench equivalence)

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1.23

0.15625
5/32

 

Close enough
5/32" and 4mm

30
0.15748

 

4
9
0.18750
3/16

 

22
0.19685

 

5

17
0.21875
7/32

 

14
0.23622

 

6

26
0.25000
1/4

 

 

6
0.27559

 

7

 

31
0.28125
9/32

 

 

2.46

0.31250
5/16

 

Close enough
5/16" and 8mm

29
0.31496

 

8
11
0.34375
11/32

 

 

21
0.35433

 

9

 

19
0.37500
3/8

 

 

13
0.39370

 

10

 

27
0.40625
13/32

 

 

4.43

0.43307

11

Close -
7/16 and 11mm

31
0.43750
7/16

 

3.69

0.46875
15/32

 

Close enough
15/32 and 12mm

28
0.47244

 

12
12
0.50000
1/2

 

 

19
0.51181

 

13

 

20
0.53125
17/32

 

 

11
0.55118

 

14

 

28
0.56250
9/16

 

 

3.20

0.59055

 

15

Close enough
19/32 and 15mm

31
0.59375
19/32
Bike
5
0.62500
5/8

 

?

26
0.62992

 Bicycle

16

13
0.65625
21/32

 

 

18
0.66929

 

17

 

21
0.68750
11/16

 

 

10
0.70866

 

18

 

29
0.71875
23/32

 

 

1.97

0.74803

 

19

Close enough
3/4 and 19mm

31
0.75000
3/4

 

6
0.78125
25/32

 

 

25
0.78740

 

20

 

14
0.81250
13/16

 

 

17
0.82677

 

21

 

22
0.84375
27/32

 

 

9
0.86614

 

22

 

31
0.87500
7/8

 

 

0.74

0.90551

 

23

Close enough
29/32 and 23mm

31
0.90625
29/32

 

7
0.93750
15/16

 

 

55
0.94488

 

24

 

 

1.00000
1

 

 

50

70

50

50

170 - 450

60



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      Conversion Factors

English
to
Metric
English

Metric

-

1 inch =
1 inch =
1 inch =

2.54 centimeters
25.4 mm
0.0254 meters

1 foot =

30.48 cm

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Metric
to
English
Metric

English

-

1 mm =

 0.03937 inches

1 cm =

0.3937 inches

1 meter =

39.37 inches

80

100

200 - 450

60



.
Allen Wrench Equivalence


DISCLAIMER
Although the author has tried to be as accurate as possible, errors are possible.

I could not find an online table like the above. So, I made this conversion chart, to help myself understand the relationships between wrench sizes of the metric system and wrench sizes of the standard system. I hope that it helps you.

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Have A Great Day
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This Vaughns Wrench Size Conversion
Chart was last updated on 2019-09-07.