SSAB ERB 240 and SSAB ERB 240+

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    General Product Description

    The ERB 240 and ERB 240+ are mostly used for tunneling and construction, but sometimes also in the mines, especially when thicker material or higher strength is needed. The tube thickness is 3 mm. The bolts are delivered in bundles of 50 bolts per bundle. The bolts have a load capacity of 240 kN.

    The ERB 240+ is made of special steel and has gone through a precise annealing process to give the bolts excellent elongation characteristics whilst maintaining good load bearing capacity.This gives the 240+ better capacity to follow rock deformation with squeezing ground or high strain concentration areas. The ERB 240+ could also be an alternative to Dynamic Rock Bolts. It can absorb energy better and be used in deeper levels in the mine.The products are available within the length range of 2.4 - 6.0 meters.

    Advantages using ERB:

    • Provides immediate and full support action
    • Accomodates large rock movements and still maintain its high load bearing capacity
    • High deformability to accommodate ground movements in tension as well as in shear

    Dimension Range

    ERB 240 and ERB 240+ comes in a variety of dimensions and load carrying specifications, please contact your local sales person for more information.

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      Product ERB 240/240+
      Profile diameter (mm) 36
      Original tube diameter (mm) 54
      Upper bushing diameter (mm) 38
      Bushing head diameter (mm) 41/48
      Standard length 1)
      (m)
      2.4 - 6.0
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        1) Other lengths upon request.

        Mechanical Properties

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          Product Wall Thickness
          (mm)
          Minimum yield load
          (kN)
          Typical Elongation A (%),
          not guaranteed
          Elongation A
          (min %)
          Typical breaking load (kN),
          not guaranteed
          Minimum breaking load (kN)
          ERB 240 3.0 200 15 10 250 240
          ERB 240+ 3.0 170 30 20 240 230
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            Tolerances

            Tolerances according to SSAB specifcations.

            Please contact your local sales person for more information regarding tolerances.

            Delivery Conditions

            Dry/oiled/ plastic coated. SSAB ERB bolts are delivered bundled. ERB 240 and ERB 240+ are delivered in bundles of 50 bolts per bundle.

            Delivery requirements can be found in SSAB’s brochure SSAB ERB – Expandable Rock Bolt or at www.ssab.com.

            Fabrication and Other Recommendations

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              Product ERB 240/240+
              Recommended hole diameter (mm) 43 - 52
              Recommended inflation pressure (bar) 300
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