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Combination® Bolt Systems

Supplier: Jennmar Australia

System Overview

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Jennmar offers the industry’s most proven Combination Bolt system in the mining industry. The Combination Bolt is a two-piece bolt.

The upper piece consists of Jennmar’s exclusive J-Bar for better mixing, stronger threads, and greater anchorage capacity. The lower piece is connected by a coupler that has our patented shear pin system.

The Combination Bolt provides ultimate tension in weak strata. The top portion (J-Bar) is encapsulated with resin, while the lower anchor is tensioned to the roof with our bearing plate.

Advantages of Jennmar’s Combination Bolts

  • The ultimate tension resin system for all seam heights.
  • Proven Shear Pin system with coupler.
  • System permits pre-bolting of overcasts for 50% savings.
  • With mine roof channel or mats savings can range from 25% to 140%.
  • Proven usage in US longwall headgate and tailgate entries as supplemental or primary support.

Installation Instructions >>

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