• Minimal visible head protrusion.
• Fast, cost saving installation from one side.
• For square, rectangular and circular hollow sections.
• High resistance to shear and tension.
• Unique High Clamping Force design (size M16).
• Low temperature tested to -45°C (carbon steel variants).
• Other head types available.

Hollo-Bolt expansion bolts require access to only one side of the Structural Hollow Section (SHS), and offer a faster alternative to welding or through-bolting, enabling contractors to reduce construction time and labour costs. Installation is quickly carried out by inserting into pre-drilled steelwork and tightening with a torque wrench. Also suitable for blind connections where access is available from one side only. The 'Countersunk Head' version also ensures that the fixing protrusion from the steelwork is kept to a minimum whilst still using a plain drilled hole in the supporting section and the outer plate / bracket.

The larger M16 Hollo-Bolts are optimised for high strength structural connections and feature a unique High Clamping Force (HCF) mechanism for superior performance.

• Manufactured from mild steel or stainless steel grade 316.
• Available with zinc plated or sheraplex finish.
• Reaction to fire: A1 (Steel)
• Corrosivity Class C1, C2 & C3 for Stainless Steel - More than 50 years

ETA - Concrete

Load Table

Technical Data Sheet

Declaration of Performance (Mechanical Anchor for use in concrete)

Fischer Free Design Software