Wrench Size Conversion Chart : Metric to SAE

Published: 7 May 2026

A Wrench Size Conversion Chart: Metric to SAE helps you quickly match metric and SAE wrench sizes for bolts and nuts. It provides an easy reference to find equivalent sizes, making repairs, automotive work, and mechanical projects faster and more accurate.

Metric Size (mm)	Closest Standard Size
3.18mm	1/8″
4mm	5/32″
5mm	3/16″
6mm	7/32″
7mm	1/4″
8mm	5/16″
9mm	11/32″
10mm	3/8″
11mm	7/16″
12mm	15/32″
13mm	1/2″
14mm	9/16″
15mm	19/32″
16mm	5/8″
17mm	21/32″
18mm	11/16″
19mm	3/4″
20mm	25/32″
21mm	13/16″
22mm	7/8″
23mm	29/32″
24mm	15/16″
25mm	1″
26mm	1-1/32″
27mm	1-1/16″
28mm	1-1/8″
29mm	1-5/32″
30mm	1-3/16″
31mm	1-7/32″
32mm	1-1/4″
33mm	1-19/64″
34mm	1-5/16″
35mm	1-3/8″
36mm	1-7/16″
38mm	1-1/2″
39mm	1-9/16″
40mm	1-9/16″
41mm	1-5/8″
46mm	1-13/16″
50mm	2″
51mm	2″
54mm	2-1/8″
55mm	2-5/32″
57mm	2-1/4″
58mm	2-9/32″
60mm	2-3/8″
63mm	2-1/2″