Lindapter has expanded its range of steelwork clamps for connecting structural steel sections in frictional load configurations, with a high-performance M24 bolt version. The new M24 Type AF bolt will securely connect channel-, angle- and I-beam secondary steelwork without drilling or welding - dramatically reducing construction time and costs. A pair of M24 Type AF bolts is guaranteed to handle very large frictional loads of up to 35 kN SWL (safe working load, with a 5:1 factor of safety).

Before the launch of this product, constructors have typically been using M30 or M36 size Lindapter fixings and bolts. Compared with these, the M24 Type AF clamp cuts costs considerably, and additionally greatly reduces the torque required for assembly.

Lindapter's new Type AF M24 design features an innovative toothed nose that delivers a high friction connection. The fixing even works on beams with tapers of up to 10 degrees, providing a compact and low cost permanent solution for connecting onto older style steelwork for refurbishment and upgrade projects.

The Type AF M24 clamp is hot-dip galvanised as standard for resistance to corrosion. The clamps are offered with a choice of 8.8 or 10.9 grade bolts, which support safe frictional working loads of 30 kN and 35 kN SWL per bolt respectively, and tensile loads of 80 and 125 kN SWL per pair of bolts. The tightening torques required for the M24 AF are 800 Nm for grade 8.8 bolts, and 1000 Nm for grade 10.9. By comparison, an M36 bolted fixing would require a typical tightening torque of 1715 Nm.


Applications for the M24 Type AF clamp are extremely diverse and may be found in all secondary steelwork construction. Markets include offshore oil and gas platforms, process engineering, civil construction, and structural steel construction on both new-build and refurbishment projects. The new AF range of clamps has been field tested as part of Lindapter's development programme, in projects including bridge and roof strengthening.

The new fixings expand an existing range of Lindapter frictional clamps with bolt sizes from M12 to M20.

Lindapter has been producing advanced fixing products that offer cost-effective alternatives to traditional methods for more than 70 years. Key market sectors include structural engineering, civil engineering, building services, process plant/offshore, mechanical handling and transportation. Initially recognised as the manufacturer of the Lindapter malleable iron hook-bolt adapter, the company has diversified to cover all aspects of fixing to or suspending from structural steelwork. As well as cavity fixings, the Lindapter range includes steelwork fixings, support fixings, floor fixings and rail fixings.

Lindapter is part of Tyco / fire & building products