| Size | Length (inches) |
Gauge | Number per pound |
|---|---|---|---|
| 10d | 3 | 6 | 41 |
| 12d | 3¼ | 6 | 38 |
| 16d | 3½ | 5 | 30 |
| 20d | 4 | 4 | 23 |
| 30d | 4½ | 3 | 17 |
| 40d | 5 | 2 | 13 |
| 50d | 5½ | 1 | 10 |
| 60d | 6 | 1 | 8 |
Formerly 7″ wire spikes were 0 gauge (0.3065″), and 8″ and 9″ spikes were 00 gauge (0.331″). Now 7″, 8″, and 9″ spikes are 5/16 inch in diameter and 10″ and 12″ spikes are 3/8 inch.
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Last revised: 1 August 2009.