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Hollow bars

DSI Dynamic Hollow Bar

Nominal outer diameter
R28: ⌀28 mm / R32: ⌀32 mm
Standard length
⌀28 mm: 2.4 m / ⌀32 mm: 2.4 & 3.0 m
Energy absorption capacity
45 kJ

Built for demanding underground conditions, the DSI Dynamic Hollow Bar Bolt combines high energy absorption with a self-drilling design for fast installation and grouting in a single operation. Available in Ø28 mm and Ø32 mm.

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Product specifications

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Technical specifications

Nominal outer diameter
R28: ⌀28 mm / R32: ⌀32 mm
Standard length
⌀28 mm: 2.4 m / ⌀32 mm: 2.4 & 3.0 m
Energy absorption capacity
45 kJ 1)
Elongation
15 % 2)

  • 1) Determined during dynamic loading of bolts bonded with Mineral Bolt resin in steel tubes, in the so-called split tube test, according to the procedure described in the ISRM Suggested Method (2025), conducted by an independent institution.

  • 2) Determined during pull-out tests of bolts installed with Mineral Bolt resin in high strength concrete blocks conducted by an independent institution.

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