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DSI Australia  ›  Products  ›  Rock Bolts  ›  Solid Bar  ›  GEWI® Threadbar

Rock Bolts – Solid Bar

Product Code GuideBolt TypeDia.LengthDrive Nut & AccessoriesCoatingPackaging
Physical PropertiesMinimumTypical
Yield Strength500MPa / 245kN550MPa / 260kN
Tensile Strength600MPa / 270kN650MPa / 305kN
Calculated Shear Strength173kN200kN
Elongation (After Fracture)16%19%
Mass Per Metre3.85kg
Bar Diameter25.0mm
Major Bar Diameter27.9mm max
Cross Sectional Area491mm²
Rolled Thread-

Key Features

  • This bolt is hot rolled with deformations that form a coarse left hand thread (10mm pitch) over its entire length.
  • The threadbar form provides good load transfer properties.
  • The continuous thread provides a high flexibility in "fragile" ground and blasting conditions as the bolt can be readily re-tensioned.
  • The threadbar bolt is normally used with resin anchors, but can be effectively used with cementitious grouts.
  • Can be supplied with a pin nut drive system.
  • Corrosion protection may be provided by hot dip galvanizing or alternative coating.
GEWI® Threadbar - Packaging

Standard Lengths & Packaging

  • Standard bolt lengths range from 600 to 3000mm in 300mm increments.
  • Non-standard requirements are available by negotiation.
  • Bolts are packaged in bundles.
  • Bolt fittings, such as nuts, anti-friction washers and dome balls, are normally supplied separate with threadbar bolts.
GEWI® Threadbar - Notes


  • Only DSI rock bolt components should be used to enable the optimum performance of the bolt system to be obtained.
  • DSI Mining Products Division is Quality Assured to ISO 9001:2008, Registration No.QAC/R61/0315.
GEWI® Threadbar - Installation Guide Lines

Installation Guide Lines

  • 26-27mm hole diameters are preferred. If larger diameter holes are to be used, refer to "Posimix" bolts on data sheet WS.
  • Hole depth is critical. Hole depth should be shorter than the bolt to allow for the height of the washer and nut.
  • It is important to follow the resin anchor recommended mixing and hold times as printed on the resin anchor cartons. DO NOT OVER MIX.


Phone: +61 2 4948 9099 Fax: +61 2 4948 4087
Email: sales@dywidag.com.au


Published: September 2011
All dimensions, weights, quantities and specifications are those applicable at the time of publication and may be amended from time to time.

Product Accessories Examples
Product Group Starplates Dome Plates Butterflies W-Strap
GEWI® Threadbar - Product Accessories Examples
Product Code Prefix STP D BUTT MW


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