Standard Wire Gauge SWG (SWG) Dia Thou (SWG) Dia mm Number Drill (Number Drill) Dia Thou (Number Drill) Dia mm Letter Drill (Letter Drill) Dia Thou (Letter Drill) Dia mm
7/0 500.00 12.70 1 228.00 5.79 Z 413 10.49
6/0 464.00 11.79 2 221.00 5.61 Y 404 10.26
5/0 432.00 10.97 3 213.00 5.41 X 397 10.08
4/0 400.00 10.16 4 209.00 5.31 W 386 9.80
3/0 372.00 9.45 5 205.00 5.21 V 377 9.58
2/0 348.00 8.84 6 204.00 5.18 U 368 9.35
1/0 324.00 8.24 7 201.00 5.11 T 358 9.09
1 300.00 7.62 8 199.00 5.05 S 348 8.84
2 276.00 7.01 9 196.00 4.98 R 339 8.61
3 252.00 6.40 10 193.00 4.90 Q 332 8.43
4 232.00 5.89 11 191.00 4.85 P 323 8.20
5 212.00 5.39 12 189.00 4.80 O 316 8.03
6 192.00 4.88 13 185.00 4.70 N 302 7.67
7 176.00 4.47 14 182.00 4.62 M 295 7.49
8 160.00 4.06 15 180.00 4.57 L 290 7.37