Canadian Mining Journal

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ROCK BOLTING EQUIPMENT NEWS Jennmar Offers High Tension Bolting System

PITTSBURGH JENNMAR's latest offering is its INSTaL HT (high tension) system featuring J1M and J8M expansion shel...


PITTSBURGH JENNMAR’s latest offering is its INSTaL HT (high tension) system featuring J1M and J8M expansion shells. The key change in the new design is a three-prong configuration that provides more surface area contact than the older four-pronged expansion shell. That means that J1M and J8M shells set more quickly and with less torque. The three-pronged design eliminates the use of heavy support nuts, improving the installed torque-tension relationship and eliminating any distortion or twisting of the expansion shells. They are suitable for use with or without resin.

The new J1M shell comes in 5/8-in. diameter for a 1-in. diameter drillhole. The J8M shell in -in and 7/8-in. diameters is suitable for 1-3/8-in. drillholes. Both meet current F432-95 rock and roof bolt specifications including the thread compression test.

For all your bolting needs see www.jennmar.com.


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