GMA AB launches its own dynamic rock bolt, the GE-Bolt (GMA Elongation Bolt)

After manufacturing 2.5 million dynamic rock bolts as a subcontractor, GMA is now taking the step to market its own rock bolt, the GE bolt.

In addition to rock bolts, GMA has various attachment expanders for the tunnel and mining industry.

Interested? Welcome to contact us for more information.

Note: GMA also has a comprehensive range for the tunnel and mining industry of packers, plugs and injection pipes. If you do not find what you are looking for then we will make it. At GMA, special is standard!

The GE bolt is available in the following dimensions:

– 20mm (M22), 22mm (M24) and 25mm (M27), Right-hand thread as standard, Left-hand thread on request.

– The bolts are available in standard lengths between 2400mm up to 3000mm and are delivered complete with nut, spherical washer and dome plate (dome paltes in different dimensions and design)

– The bolts can be delivered with wedge (Cement Wedge) or 45 ° cut at the top

– The bolt was tested at Swerim in the spring of 2020 and meets current market requirements, including energy uptake of 58 Kj (∑2 drop test, 2 tons, no breakage)

Do you have this kind of problem?

We can probably help you.

We have designed a new product that will make it easier to insert the packer into holes with flushing water.
We have constructed packers with a guide at the front which centers the packer into the hole and simplifies the installation of the packer.

At high pressure the packer can be installed with a strengthened injection pipe. If it needs extra force it`s possible to use the Jumbo and the pipe can then be adapted to it.


Adapter to divert the water

1” reusable packer

½” reusable packer

½” Disposable packer

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