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M8 Hollo-Bolt® Structural Expansion Bolt

M8 Hollo-Bolt® Structural Expansion Bolt

The M8 Hollo Bolt® is a fast and effective solution for fastening structural hollow section when access is limited to one side, replacing the need for brackets or strapping of steel.

The Hollo Bolt® expansion bolt design employs the blind fastening system, the M8 can fasten up to 60mm of joining material. Hollo bolts are simply inserted through pre drilled holes and tightened with a torque wrench.

  • 8.8 grade hi tensile steel
  • hot dipped galvanised
AS 4100 / NZS 3404
ETA 10/0416
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Size Clamping Thickness Unit(s) EX.GST QTY
Size Clamping Thickness - Pack Qty.- $ Ex. GST -
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Product List
SKU Item Clamping Thickness Clearance Dia. Bx. Qty. Crt. Qty.
SKU 6MHB08-1-HDG Item M8 x 50mm Hollo-Bolt HDG Clamping Thickness 3 - 22 mm Clearance Dia. 14 mm (+1.0 / -0.2) Bx. Qty. 1 Crt. Qty. 100
SKU 6MHB08-2-HDG Item M8 x 70mm Hollo-Bolt HDG Clamping Thickness 22 - 41 mm Clearance Dia. 14 mm (+1.0 / -0.2) Bx. Qty. 1 Crt. Qty. 100
SKU 6MHB08-3-HDG Item M8 x 90mm Hollo-Bolt HDG Clamping Thickness 41 - 60 mm Clearance Dia. 14 mm (+1.0 / -0.2) Bx. Qty. 1 Crt. Qty. 50

National Standards

Design to AS 4100 / NZS 3404 (Steel Structures) and ETA and ICC product certification.

Drill Preparation

Ensure that holes are drilled in both the fixture and the section according to the drilling guidance below. Please note that clearance holes are slightly larger than standard bolt clearance holes to accommodate the sleeve and cone.


  1. Align pre-drilled fixture and section and insert Hollo-Bolt*.
  2. Grip the Hollo-Bolt collar with an open ended spanner.
  3. Using a torque wrench, tighten the central bolt to the recommended torque**.


*Before tightening, ensure that the materials that are to be connected together are touching.

**See product brochure for correct tightening torque. Power tools, such as an impact wrench, may be used to speed up the tightening of the Hollo-Bolt. However, when using power tools, always complete the tightening process with a torque wrench to ensure the correct torque is applied to the Hollo-Bolt.

Hollo-Bolt® and Lindapter® is a registered trademark of Lindapter International.