20 & 24mm Solid Deformed Bolt

Physical Properties

 

20mm BoltMinimumTypical
 Yield Strength500MPa150kN540MPa160kN
Ultimate Tensile Strength540MPa160kN635MPa190kN
Calculated Shear Strength100kN125kN
Standard Elongation5%20%
Tensile Strength of Threaded End140kN
Uniform Elongation12%
Mass Per Metre2.46kg
Bar Core Diameter19.5mm
Cross Sectional Area of Bar 300mm2
Major Bar Diameter23.0mm
Bar straightness to AS 1442-1991
Rolled Thread M24x3.0mm Pitch

 

 

24mm Bolt MinimumTypical
Yield Strength500MPa200kN540MPa220kN
Ultimate Tensile Strength540MPa220kN635MPa260kN
Calculated Shear Strength145kN170kN
Standard Elongation5%20%
Uniform Elongation12%
Tensile Strength of Threaded End200kN
Mass Per Metre3.55kg
Bar Core Diameter23mm
Cross Sectional Area of Bar 415mm2
Major Bar Diameter27.0mm
Bar straightness to AS 1442-1991
Rolled Thread M24x3.0mm Pitch

 

 

General Features

  • The Solid Deformed Bolt is manufactured from hot rolled reinforcing bar and usually has rib deformations in a "herringbone" form.
  • The 24mm Solid Deformed Bolt can be used in applications where the small diameter hole recommended for other 24mm chemical bolts cannot be drilled.
  • The Solid Deformed Bolt has a standard thread roll formed at one end.
  • The Solid Deformed Bolt is usually fully encapsulated with chemical anchors (refer to Section F), but can be effectively used with cementitious grouts.
  • The Solid Deformed Bolt is commonly used in civil tunnelling applications.
  • Corrosion protection may be provided by hot dip galvanizing. (refer to Section G). Alternative coatings are available by negotiation.

Installation Guidelines

  • 30-32mm hole diameters are preferred. If larger diameter holes are to be used, refer to "Posimix" bolts on page A1.10.
  • Hole depth is critical. Hole depth should be shorter than the bolt to allow for the height of the washer and nut.
  • After insertion of the chemical anchors, the bolt is rotated through the anchors while being pushed to the back of the hole.
  • It is important to follow the chemical manufacturer’s recommended mixing and hold times as printed on the chemical anchor cartons. DO NOT OVER-MIX.
  • For further details of installation procedures, refer to DSI’s "Practical Guide to Rock Bolting."

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 with threads protected by heavy duty polyethylene bags.
  • Bolt fittings, such as nuts, anti-friction washers and domed balls, are supplied fitted to rock bolts in the configuration requested.

Notes

  • Only DSI rock bolt components should be used in order to obtain full performance of the bolt system.
  • DSI's Mining Products Division is Quality Assured to ISO 9001:2000, Registration No.QAC/R61/0315.