Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Wrench Size Conversion Chart – Metric (mm) to SAE (Inches)

Convert between metric and SAE (inch) wrench sizes with this comprehensive comparison chart. Find the closest equivalent sizes for your tools, whether working with US standard (SAE) or metric fasteners.

Wrench - inches vs mm

Wrench Spanners - Inches vs. mm
Standard SAE U.S. Wrench/Spanner Size
(inches)
Metric Wrench/Spanner Size
(mm)
1/8 3.18
5/32 3.97
4
3/16 4.76
5
13/64 5.16
7/32 5.56
15/64 6.05
6
1/4 6.35
17/64 6.75
7
9/32 7.14
5/16 7.94
8
11/32 8.73
9
3/8 9.53
10
11
7/16 11.11
15/32 11.91
12
1/2 12.7
13
17/32 13.49
14
9/16 14.29
15
19/32 15.08
5/8 15.88
16
21/32 16.67
17
11/16 17.46
18
19
3/4 19.05
25/32 19.84
20
13/16 20.64
21
22
7/8 22.23
23
29/32 23.02
15/16 23.81
24
31/32 24.61
25
1 25.40
26
1 1/16 26.99
27
28
1 1/8 28.58
29
30
1 3/16 30.16
31
1 1/4 31.75
32
33
1 5/16 33.34
34
1 3/8 34.93
35
36
1 7/16 36.51
38
1 1/2 38.10
39
1 9/16 39.69
40
41
1 5/8 41.28
1 11/16 42.86
1 3/4 44.45
46
1 13/16 46.04
1 7/8 47.63
1 15/16 49.21
50
2 50.80
51
2 1/8 53.96
54
2 1/4 57.15
2 3/8 60.33
2 1/2 63.5
3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter


















































4.9.9

.