BWG to mm – Wire Gauge For Nails

BWG is a wire gauge system for wire nails. We have a chart that convert BWG to mm for nail wire thickness.

BWG is short for Birmingham Wire Gauge. It is a wire gauge system. Since nails are manufactured from steel wires, BWG is the perfect system to evaluate nail wire thickness.

Besides wires, BWG is also used to specify the thickness or diameter of needles and tube products.

BWG Wire Gauge Tools

Gauge System For Nail Wire

Concerning nails, the gauge number is used to specify the outside diameter of the wire.

  • Lowest gauge number is 5/0, equals to largest thickness 0.500 inch (12.7mm)
  • Largest gauge number is 36, equals to smallest thickness 0.004 inch (0.102mm)

The common size for umbrella head roofing nails is BWG9*2.5″. Meaning the wire thickness is BWG9 = 0.148 inches = 3.759mm. (According to conversion in Chart 1 below).

Conversion Table

Covert BWG to inches and mm. Very useful to convert wire nail gauge into milimeter.

BWGinchesmm
(5/0)0.50012.7
(4/0)0.45411.532
(3/0)0.42510.795
(2/0)0.3809.652
00.3408.636
10.3007.62
20.2847.213
30.2596.579
40.2386.045
50.2205.588
60.2035.156
70.1804.572
80.1654.191
90.1483.759
100.1343.404
110.1203.048
120.1092.769
130.0952.413
140.0832.108
150.0721.829
160.0651.651
170.0581.473
180.0491.245
190.0421.067
200.0350.888
210.0320.813
220.0280.711
230.0250.635
240.0220.559
250.0200.508
260.0180.457
270.0160.406
280.0140.356
290.0130.330
300.0120.305
310.0100.254
320.0090.229
330.0080.203
340.0070.178
350.0050.127
360.0040.102
Chart 1