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Duraset

Threaded Rock Studs

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Headed Rock Bolts (Right)
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Overview of Mechanically Anchored Rock Studs and Rock Bolts (Anchor Bar)

Mechanically anchored (also known as end anchored) rock bolts (anchor bar) or rock studs, are extensively used in the support of underground excavations. This type of support is recommended for the short to medium term where no subsequent support of a more permanent nature is envisaged i.e. shotcrete and or wire meshing and lacing.

Rock bolts and studs are used with various accessories (depending on the application and geological conditions). In order to select the correct accessories for your particular application and conditions, please refer to the Rock Bolt Accessories - Bearing Plates, Nuts and Spherical Seats section.

In order to ensure that you receive the maximum benefit in terms of performance and safety from our products, please refer to our detailed Installation Methods and Procedures section.

Applications

Threaded Rock Studs (Anchor Bar):

  • Where additional thread may be required to take up any play between the bearing plate and the rock surface (e.g. pulling wire mesh into depressions in the rock surface).
  • Where it may be important not to impart torque to the shank of the bolt during pre-tensioning.


Headed Rock Bolts (Anchor Bar):

  • Where the minimum amount of bolt protrusion from the hole is required (e.g. low roof).
  • Where thrust pre-loading is preferred to torque pre-loading.
  • Where no protruding thread is required for the suspension of eye-nuts etc.
SPECIFICATIONS
Lengths Studs and bolts are available in standard lengths from 0.6 m to 3.0 m in increments of 0.3 m. The length of studs is measured overall and bolts from the threaded end to under the forged head. Non standard lengths are available on request.
Available Thread Types and Sizes (LH and RH Available) All threads are formed by a cold rolling process and are available in either left or right handed threads.
Metric UNC DIN 405
M16 x 2 - 8g 5/8" - 11 (1A) R16 x 8
M20 x 2.5 - 8g 3/4" - 10 (1A) R20 x 8
Mechanical Properties Yield
Strength
Mpa (Min)		 Ultimate Tensile
Strength
Mpa (Min)		 Elongation
%
(Min)
360 570 13
Manufacturing Process All material is cold drawn prior to threading so as to eliminate any out-of-roundness associated with hot rolled bar

Copyright © 2008 Duraset
Manufacturer of Rock Bolts, Studs & Mechanical Anchors

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