Wrench Conversion Table
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Wrench Conversion Table - Equivalent Sizes
Difference in 1/1000s of an inch
Size in Inches
Standard SAE Wrench Size (inches)
1
0.156
5/32
30
0.157
9
0.188
22
0.197
17
0.219
14
0.236
26
0.250
6
0.276
31
0.281
9/32
0.313
5/16
2 29
0.315
11
0.344
21
0.354
19
0.375
13
0.394
27
0.406 4
31 4
0.512
20
0.531
11
0.551
28
0.563
1mm= 0.03937" 6
1cm= 0.3937"
1/4 7
8
Close enough (5/16 and 8mm)
11/32 9 3/8 10 13/32 11
15/32
19
1"= 2.54cm (= 0.254m)
7/32
0.469
0.500
Close enough (5/32 and 4mm)
5
7/16
12
Notes - compares Standard and Metric wrench sizes(where they MATCH, and where they don't - wrench equivalence)
3/16
0.438
0.472
3
4
0.433
28
Metric Wrench Size (mm)
12
Close enough (7/16 and 11mm)
Close enough (15/32 and 12mm)
1/2 13 17/32 14 9/16
0.591
15
31
0.594
19/32
5
0.625
5/8
26
0.630
Bicycle
Bicycle
Close enough (19/32 and 15mm) ?
16
13
0.656
18
0.669
21
0.688
10
0.709
29
0.719 2
21/32 17 11/16 18 23/32
0.748
19
31
0.750
3/4
6
0.781
25/32
25
0.787
14
0.813
17
0.827
22
0.844
9
0.866
31
0.875 1
20 13/16 21 27/32 22 7/8
0.9055
23
31
0.9063
29/32
7
0.938
15/16
55
0.945 1.000
Close enough (3/4 and 19mm)
Close enough (29/32 and 23mm)
24 1
NOMENCLATURE English to Metric 1 inch = 2.54 centimeters (= 0.254m) Metric to English 1 centimeter = 0.3937 inches 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.
Difference in 1/1000s of an inch
Size in Inches
Standard SAE Wrench Size (inches)
1
0.156
5/32
30
0.157
9
0.188
22
0.197
17
0.219
14
0.236
26
0.250
6
0.276
31
0.281
9/32
0.313
5/16
2 29
0.315
11
0.344
21
0.354
19
0.375
13
0.394
27
0.406 4
31 4
0.512
20
0.531
11
0.551
28
0.563
1mm= 0.03937" 6
1cm= 0.3937"
1/4 7
8
Close enough (5/16 and 8mm)
11/32 9 3/8 10 13/32 11
15/32
19
1"= 2.54cm (= 0.254m)
7/32
0.469
0.500
Close enough (5/32 and 4mm)
5
7/16
12
Notes - compares Standard and Metric wrench sizes(where they MATCH, and where they don't - wrench equivalence)
3/16
0.438
0.472
3
4
0.433
28
Metric Wrench Size (mm)
12
Close enough (7/16 and 11mm)
Close enough (15/32 and 12mm)
1/2 13 17/32 14 9/16
0.591
15
31
0.594
19/32
5
0.625
5/8
26
0.630
Bicycle
Bicycle
Close enough (19/32 and 15mm) ?
16
13
0.656
18
0.669
21
0.688
10
0.709
29
0.719 2
21/32 17 11/16 18 23/32
0.748
19
31
0.750
3/4
6
0.781
25/32
25
0.787
14
0.813
17
0.827
22
0.844
9
0.866
31
0.875 1
20 13/16 21 27/32 22 7/8
0.9055
23
31
0.9063
29/32
7
0.938
15/16
55
0.945 1.000
Close enough (3/4 and 19mm)
Close enough (29/32 and 23mm)
24 1
NOMENCLATURE English to Metric 1 inch = 2.54 centimeters (= 0.254m) Metric to English 1 centimeter = 0.3937 inches 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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