PAR1 Bolt

PAR1 Bolt


The PAR1 Bolting system is an end-anchored yielding bolt that is grouted post-installation and can be supplied with attachment points for meshing and lacing. The end anchor provides immediate support upon installation and two pairs of double paddles act as additional anchors once the bolt is grouted.

The PAR1 Bolt has an elongation of 23% in static conditions and 15% under dynamic loading. The unit is provided with a collapsible load indicator to confirm correct tensioning of the unit when installed. The end of the bolt protruding from the hole has a threaded section over which a washer is placed and held in place by a nut, which is also used for pre-tensioning of the unit. A specially designed seal ensures easy grouting of the installed PAR1 Bolt with minimal spillage of grout during pumping. An optional non-return valve can be incorporated in the grout seal to prevent any leakage of grout once the pumping system is disconnected.

Benefits of the bolt

  • High yield
  • High energy absorption
  • Fully mechanised or manual installation and grouting
  • Immediate support
  • Pre-tensionable with load indicator
  • Easy grouting with reduced spillage
  • Includes attachment points for meshing and lacing directly onto the bolt


Bar diameter (mm) Ø20
Length of bolt (m) 1.8 – 3.0
Minimum yield load (kN) 150
Minimum ultimate tensile load (kN) 205
Minimum elongation* 22%
Hole size range (mm)** Ø38 – Ø43
*Tested as per SANS 6892-1:2010 (Ed. 1.00)
**Ø40 – Ø45 shell size also available on request


Standard uncoated bolt

Optional zinc diffusion coating