British Wire Gauge (SWG) Size Chart: Quick Reference for Wire Manufacturers

Release Time:

Apr 10,2026

This chart lists SWG numbers with their corresponding diameters in millimeters (mm), formatted for quick lookup. It’s refined from years of supporting wire producers with precise SWG wire production.

For wire manufacturers exporting to SWG-dominant markets (Europe, Middle East, Africa), having an accurate, easy-to-reference British Wire Gauge (SWG) size chart is essential. Below is a complete, error-corrected SWG size chart for iron wire—our go-to reference for customers using SATLE wire drawing machines to produce SWG-compliant products.
British Wire Gauge (SWG) Size Chart: Quick Reference for Wire Manufacturers

Complete British Wire Gauge (SWG) Size Chart for Iron Wire

This chart lists SWG numbers with their corresponding diameters in millimeters (mm), formatted for quick lookup. It’s refined from years of supporting wire producers with precise SWG wire production.
SWG Number
Diameter (mm)
SWG Number
Diameter (mm)
SWG Number
Diameter (mm)
0#
8.230
14#
2.032
28#
0.376
1#
7.020
15#
1.829
29#
0.345
2#
7.010
16#
1.626
30#
0.315
3#
6.401
17#
1.422
31#
0.295
4#
5.893
18#
1.219
32#
0.274
5#
5.385
19#
1.016
33#
0.254
6#
4.877
20#
0.914
34#
0.234
7#
4.470
21#
0.813
35#
0.213
8#
4.064
22#
0.711
36#
0.193
9#
3.658
23#
0.610
37#
0.173
10#
3.251
24#
0.559
38#
0.152
11#
2.946
25#
0.508
39#
0.132
12#
2.642
26#
0.457
40#
0.122
13#
2.337
27#
0.417
41#
0.112
Need precision wire drawing equipment to produce consistent SWG-sized wire? SATLE’s machines are engineered for tight diameter control, supporting your export needs with reliability and efficiency. Reach out for a tailored solution.

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