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 0.118". The bolts are delivered in bundles of 50 bolts per bundle. The bolts have a load capacity of 44,96 kipf.

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 94.488 - 236.220".

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

SSABs Expandable rock bolts 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 (inmm) 1.41736
    Original tube diameter (inmm) 2.12654
    Upper bushing diameter (inmm) 1.49638
    Bushing head diameter (inmm) 1.614 / 1.89041 / 48
    Standard length 1)
    (inmm)
    94.488 - 236.2202400 - 6000
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    Comparison

      Product
      Profile diameter (inmm)
      ERB 240/240+
      1.41736
      Product
      Original tube diameter (inmm)
      ERB 240/240+
      2.12654
      Product
      Upper bushing diameter (inmm)
      ERB 240/240+
      1.49638
      Product
      Bushing head diameter (inmm)
      ERB 240/240+
      1.614 / 1.89041 / 48
      Product
      Standard length 1)
      (inmm)
      ERB 240/240+
      94.488 - 236.2202400 - 6000

      1) Other lengths upon request.

      Mechanical Properties

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        Product Wall Thickness
        (inmm)
        Minimum yield load
        (kipf)
        Typical Elongation A (%),
        not guaranteed
        Elongation A
        (min %)
        Typical breaking load (kipf),
        not guaranteed
        Minimum breaking load (kipf)
        ERB 240 0.1183.0 44.96 20 15 56.2 53.95
        ERB 240+ 0.1183.0 38.22 30 25 53.95 51.7
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        Comparison

          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 (inmm) 1.693 - 2.04743 - 52
            Recommended inflation pressure (psi) 4351
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            Comparison

              Product
              Recommended hole diameter (inmm)
              ERB 240/240+
              1.693 - 2.04743 - 52
              Product
              Recommended inflation pressure (psi)
              ERB 240/240+
              4351