Rock Bolts – Bolt Fittings
|Bolt Diameter (mm)||Thread Form||Nominal Hole Diameter (mm)||Shell Length (mm)||Wedge Length (mm)||Nett Weight (kg)|
- DSI Underground expansion shells hold in any rock strata which is sufficiently competent to provide an adequate anchorage. They are designed to anchor in soft ground or hard rock. In good strata, the anchorage exceeds the ultimate strength of the steel bolt. All expansion shells require a competent strata in the anchor zone. The suitability of the anchorage and the specific expansion shell to be used is best determined by physical load testing.
- DSI Underground expansion shells feature parallel contact with the hole wall with sharp serrations on the outside leaves ensuring positive holding power.
- The expansion shell assembly is securely held by a strong protective sleeve, to save installation time and prevent loss of parts while handling. The sleeve must be removed prior to installation.
- Corrosion protection may be provided by hot dip galvanizing or zinc plated to AS1789-1984.