Roof bolts are round metal rods of a particular length and diameter that are threaded on one end for the attachment of and/or nut (s).

Applications
Roof bolts are used in underground mining operations to anchor tunnel roof thus preventing it from falling. This is achieved by first drilling a suitably sized hole into roof that penetrates several rock layers. The ribbed rod covered with resin is inserted into the hole while the washer/nut assembly remains on the outside. The tensile strength of the rod prevents the roof from collapsing.

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Technical Specifications

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CSIR Test Results.
Roof Bolts for Underground Mining
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Assembled Resin Bolts
Assembled Resin Bolts
Nibbed Resin Bolt
Shear-pin Resin Bolt
Rib Dome Dog-ear Washer