Body jewelry and needles tend to be identified by their gauge, using the Browne & Sharpe or American wire gauge system, at least in North America (many other regions simply use metric sizing). The larger the gauge, the smaller the diameter
Gauges |
Ball sizes |
Length or Diameter |
| Metric |
Gauges |
Metric |
Inches |
Metric |
Inches |
| 0.5 mm |
24 ga |
2.0 mm |
5/64" |
4.5 mm |
3/16" |
| 0.6 mm |
22 ga |
2.5 mm |
3/32" |
6.0 mm |
7/32" |
| 0.8 mm |
20 ga |
3 mm |
1/8" |
7.0 mm |
9/32" |
| 1.0 mm |
18 ga |
4 mm |
5/32" |
8.0 mm |
5/16" |
| 1.2 mm |
16 ga |
5 mm |
3/16" |
9.0 mm |
11/32" |
| 1.6 mm |
14 ga |
6 mm |
1/4" |
10.0 mm |
3/8" |
| 2 mm |
12 ga |
8 mm |
5/16" |
11.2 mm |
7/16" |
| 2.5 mm |
10 ga |
10 mm |
3/8" |
12.0 mm |
15/32" |
| 3.2 mm |
8 ga |
12 mm |
1/2" |
14.0 mm |
9/16" |
| 4 mm |
6 ga |
|
|
15.0 mm |
19/32" |
| 5 mm |
4 ga |
16.0 mm |
5/8" |
| 6 mm |
2 ga |
18.0 mm |
11/16" |
| 8 mm |
0 ga |
19.0 mm |
3/4" |
| 9mm |
00 ga |
20.0 mm |
25/32" |
| 12 mm |
1/2" ga |
22.0 mm |
7/8" |
| 16mm |
5/8" ga |
24.0 mm |
15/16" |
| 19mm |
3/4" ga |
25.0 mm |
1" |
| 22mm |
7/8" ga |
26.0 mm |
1 1/32" |