Now we deliver our largest packer

Published on: 6 November, 2020 by Thorbolt

Complete system with 1m packer, hydraulic pistons and hydraulic units

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

Published on: 4 November, 202028 April, 2021 by Thorbolt

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)

We building new part of factory

Published on: 26 November, 201726 November, 2017 by Thorbolt

Ground is being dug for a new part of the GMA factory

Do you have this kind of problem?

Published on: 21 December, 201621 December, 2016 by Thorbolt

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.