Hex drill steel system
hex drill steel system 22mm,28mm, roof bits, roo rod, chucks,wrenches etc.
Specifications︰ 1″ ,13/8″, 1 1/2″
| Coal bolting bits | Main Standard(mm) | 序列号 | |||
| D | B | d | H | ||
 |
27 | 16 | 24 | 57 | HQ27-B16 |
| 35 | 22 | 32 | 67 | HQ35-B22 | |
 |
D | H | L | M(thread) | |
| 27 | 44 | 17 | M12 | HQ27/2 | |
| 32 | 54 | 17.5 | M12 | HQ32/2 | |
| 42 | 52 | 22 | M14 | HQ42/2 | |
| 65 | 60 | 22 | M16 | HQ65/2 | |
 |
D | H | L | d | |
| 40 | 65 | 23.5 | 8.2 | HQ40/2 | |
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