SSAB Expandable Rock Bolt for instant rock reinforcing

SSAB ERB (Expandable Rock Bolt) is the instant solution for rock reinforcing in underground mines and tunnels. Just add water, no chemicals. It’s the safest and most environmentally friendly way to speed up your tunneling operation.

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Instant installation

SSAB ERB is the fastest way to secure the rock roof when tunneling and mining in both soft and hard rock. The bolts are not sensitive to variations in drill hole diameter.

Instant load bearing

When the hole is drilled, the folded rock bolt is inserted and expanded with water from a high-pressure pump. As soon as the bolt is expanded it squeezes tightly against the rock. The load is carried immediately – no waiting for grout or resin to harden.

Instant safety

SSAB ERB rock bolts are made of a steel with exceptional formability properties, ensuring a safe and reliable performance in different rock conditions.

Strong and sustainable rock bolt made in Sweden

The expandable rock bolt is an ingenuous concept. The omega-shaped tube introduced a brand-new way of securing rock roofs from caving in. It’s a tried and tested technology used all over the world.

SSAB ERB rock bolts are made exclusively with high-quality steel from the Nordics and manufactured at an SSAB plant in Sweden. The whole production chain from iron ore to finished bolt is controlled by SSAB. The steel used is clean with consistent properties and extremely good elongation, necessary properties to achieve the rock bolt’s reinforcing qualities.

Since SSAB ERB are installed by just using water, there are no potential hazards from chemicals to worry about during installation or afterwards. The pure steel bolts can remain in the rock without giving any environmental impact.

How SSAB ERB work

SSAB ERB bolts are delivered ready to use. The folded tubes have a closed bushing at the top and a connector bushing at the end, where the pressure hose is attached. The high-pressure water inflates the bolt until it squeezes tight to the hole’s wall. 

The whole procedure is simple and straightforward in all kinds of tunneling and mining operations. The method is suitable for both mechanized and manual installation, and the equipment needed is easy to move around and power.

SSAB ERB rock bolt are also available in a corrosion-resistant coated version.

  1. The hole is drilled to the necessary length with standard rock drilling equipment.
  2. The bolt is inserted with or without the optional face plate.
  3. Pressure pump is attached and expands the pipe with a pressure up to 30 MPa.
  4. Pump is removed and the rock is secured.

Jokisivu Gold Mine trusts SSAB ERB

Timo Ridaskoski, Mine Manager at the Jokisivu Gold Mine in the southern part of Finland relies on SSAB ERB expandable rock bolts for rock reinforcing at depths of over half a kilometer. 

A full range of rock bolts

SSAB ERB comes in a variety of dimensions and load carrying specifications. They are available with 12, 16 and 24 tonne load capacity. There is also an SSAB ERB+ version which has higher elongation performance for particularly dynamic rock conditions. Both SSAB ERB and SSAB ERB+ can be delivered in a Fully Wide Gap version. In this case the folded tube has a wider opening which makes it more suitable for corrosion protection with a plastic coating.

Get your SSAB ERB rock bolts here

SSAB ERB are sold directly from SSAB sales offices and by selected distributors. SSAB ERB are stocked in several parts of the world to ensure fast deliveries. SSAB ERB bolts are delivered bundled for easy handling and transporting. Larger volumes can be shipped in containers directly to site.

Polymer coating for corrosion protection

SSAB ERB and SSAB ERB+ bolts can be delivered with corrosion protection from a polymer alloy coating. This will save a step in your production and thereby time and money.

SSAB ERB and SSAB ERB+ technical specifications


ERB 120 ERB 120+ ERB 160 ERB 160+ ERB 240 ERB 240+
Bolt diameter 28 mm
28 mm  38 mm 38 mm 38 mm 38 mm
Profile diameter 27.5 mm
27.5 mm  36 mm 36 mm 36 mm 36 mm
Material thickness 2 mm
2 mm  2 mm 2 mm 3 mm 3 mm
Upper bushing diameter 28 mm
28 mm  38 mm 38 mm 38 mm 38 mm
Inflation bushing diameter 30/37 mm
30/37 mm  41/48 mm 41/48 mm 41/48 mm 41/48 mm
Hole diameter 32 - 39 mm 32 - 39 mm 43 - 52 mm 43 - 52 mm 43 - 52 mm 43 - 52 mm
Minimum breaking load 120 kN 120 kN 160 kN 160 kN 240 kN 230 kN
Minimum elongation 15 % 25 % 15 % 25 % 15 % 25 %
Typical elongation 20 % 30 % 20 % 30 % 20 % 30 %
Standard length* 1.5 - 4.0 m 1.5 - 4.0 m 2.4 - 6.0 m 2.4 - 6.0 m 2.4 - 6.0 m 2.4 - 6.0 m

*other lengths upon request


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