Converting Metric to Standard for Wrench Sizes: A Comprehensive Guide

To convert metric measurements to standard, we need to use a conversion factor. For wrench sizes, we'll use the formula of multiplying the metric measurement by 0.03937 to convert to inches. For example, if you have a wrench that measures 10mm, the conversion would be as follows:

10mm x 0.03937 = 0.3937 inches

Using this formula, you can convert any metric measurement to inches. Below is a table that provides common metric sizes and their standard equivalents for wrench sizes from 1mm to 150mm.

Metric Size (mm)	Inches	Wrench Size (Standard)
1	0.039	1/16
1.5	0.059	5/64
2	0.079	3/32
2.5	0.098	7/64
3	0.118	1/8
3.5	0.138	9/64
4	0.157	5/32
4.5	0.177	11/64
5	0.197	3/16
5.5	0.217	7/32
6	0.236	1/4
7	0.276	9/32
8	0.315	5/16
9	0.354	11/32
10	0.394	3/8
11	0.433	7/16
12	0.472	15/32
13	0.512	1/2
14	0.551	9/16
15	0.591	19/32
16	0.63	5/8
17	0.669	21/32
18	0.709	11/16
19	0.748	3/4
20	0.787	25
21	0.827	13/16
22	0.866	7/8
23	0.906	29/32
24	0.945	15/16
25	0.984	31/32
26	1.024	1
27	1.063	1 1/16
28	1.102	1 1/8
29	1.142	1 5/32
30	1.181	1 3/16
32	1.26	1 1/4
34	1.339	1 5/16
35	1.378	1 3/8
36	1.417	1 7/16
38	1.496	1 1/2
41	1.614	1 5/8
46	1.811	1 13/16
50	1.969	2
55	2.165	2 3/16
60	2.362	2 3/8
65	2.559	2 9/16
70	2.756	2 3/4
75	2.953	2 15/16
80	3.15	3 1/8
85	3.346	3 5/16
90	3.543	3 1/2
95	3.74	3 3/4
100	3.937	4
105	4.134	4 1/8
110	4.331	4 5/16
115	4.528	4 1/2
120	4.724	4 3/4
125	4.921	4 15/16
130	5.118	5 1/8
135	5.315	5 5/16
140	5.512	5 1/2
145	5.709	5 11/16
150	5.906	5 7/8

 

 

Note that these conversions are approximate and may not be exact due to variations in manufacturing tolerances.

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