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DSI Australia  ›  Products  ›  Rock Bolts  ›  Solid Bar  ›  Mechanical Pre-grouted MP Thread bar Bolt

Rock Bolts – Solid Bar

Product Code GuideBolt TypeDia.LengthDrive Nut & AccessoriesCoatingPackaging
Physical PropertiesMinimumTypical
Yield Strength500MPa / 160kN550MPa / 170kN
Tensile Strength600MPa / 185kN650MPa / 200kN
Calculated Shear Strength120kN130kN
Elongation (After Fracture)16%19%
Mass Per Metre2.47kg
Bar Core Diameter20.0mm
Major Bar Diameter22.1mm
Cross Sectional Area310mm²
Rolled ThreadM20 left hand

Key Features

  • The MP Bolt consists of a bar thread, specially designed expansion shell and drive nut.
  • The MP Bolt Expansion Shell has been designed to reduce the grout resistance upon bolt installation.
  • The MP Bolt provides immediate rock reinforcement through mechanical anchorage while the grout cures.
  • The MP Bolt bar is hot rolled with deformations that form a course left hand thread (10mm pitch) over its entire length.
  • Single pass bolt installation.
  • The thread bar form provides good load transfer properties.
  • Corrosion protection provided by full column grout.
  • Provides immediate support.
  • Drive nut ensures reliable setting of the Expansion Shell and provides a bolt tail for subsequent meshing.
  • Additional corrosion protection may be provided by hot dip galvanizing.
Mechanical Pre-Gouted MP Thread Bar Bolt - Packaging

Standard Lengths & Packaging

  • Standard bolt lengths range from 600 to 5000mm in increments of 300mm.
  • Non-standard requirements are available by negotiation.
  • Bolts are packaged in bundles with threads protected by heavy duty polyethylene bags.
  • Bolt fittings, such as nuts, ant-friction washers and dome balls, are supplied fitted to rock bolts in the configuration requested.
Mechanical Pre-Gouted MP Thread Bar Bolt - 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.
Mechanical Pre-Gouted MP Thread Bar Bolt - Installation Guide Lines

Installation Guide Lines

  • 35mm hole diameter are preferred.
  • The drilled hole length must be longer than the bolt by approximately 50mm.
  • Appropriate components are fitted to the bolt. The Expansion Shell is screwed onto the bolt until the bolt thread just protrudes through the Expansion Shell plug.
  • The hole is pregrouted by retracting the hose from the toe to the collar.
  • The bolt is inserted through the grout.
  • After placing the bolt in the hole to its full length, the bolt is rotated to set the expansion shell and apply tension.

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
Mechanical Pre-Gouted MP Thread Bar Bolt - Product Accessories Examples
Product Code Prefix STP D BUTT MW
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