Rock Bolts – Bolt Fittings
| Code | Grade | Typical Break-Out Torque Range (lbs) | Typical Break-Out Torque Range (Nm) |
|---|---|---|---|
| LBK | Low | 30-50ft/lbs | 40Nm-67Nm |
| MBK | Med | 60-90ft/lbs | 81Nm-122Nm |
| HBK | High | 85-110ft/lbs | 115Nm-149Nm |
| MBK/HBK | Double Pin | 150-190ft/lbs | 203Nm-257Nm |
Key Features
DSI Underground Mining Products Division has continued to develop torque resistance nuts which provide greater benefits over and above the hot forged mixing square enabling the use of a single spanner operation in installation of chemical rock bolts. Similarly there has been a continued quest to improve earlier versions of Drive Nuts.
DSI Underground Nuts stand out in offering the following:
- Pin placed both through bolt and nut for effective shearing.
- No residual drag, hence the ability to gain a greater pre-tension of bolt.
- Less strain on operators using hand held roof bolters due to a smooth break-out mode.
- The Pin Nut is available to suit the majority of DSI Underground rock bolts.
- Corrosion protection can be provided by zinc plating to AS.1789-1984.
- Australian Patent Number 647259 is applicable to DSI Underground Pin Nut.
