Technical Data Sheets
Certifications
General Guidance
31/21 Axis Curve Channel
31/21 Axis Curve Channel is ACS’s patented cast-in channel system for fixing masonry support brackets back to reinforced concrete. Its curved lip profile locks the specially designed T Head Bolt in place with a simple twist and fix action – no on-site drilling or post-fixing, and none of the time, noise or health and safety risk that comes with it.
Technical Data Sheets
Certifications
General Guidance
Fixing With The ACS Curve T Head Bolt
The ACS Curve T Head Bolt (M12, A4 stainless steel, property class 70) is inserted through the slot in the back of the bracket and between the channel lips, then turned 90 degrees to lock into the curved profile. A slot on the shank shows orientation – approximately vertical once locked – and nuts and Form B washers allow level adjustment before tightening to 25Nm.
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Key Specification Details
- Patented cast-in channel and T Head Bolt system, removing the need for on-site drilling or post-fix anchors.
- Medium duty channel with around 20% higher load capacity than a standard 38/17 rectangular section, using less material
- Grade 304 (1.4301) austenitic stainless steel with welded anchor studs at 150mm centres, with every tang weld electronically validated and at least 3 random welds per channel tensile tested
- M12 ACS Curve T Head Bolt to BS EN ISO 3506-1:2009, tightened to 25Nm
- Design resistance of 11.5kN (NRd tension and VRd shear) at a nominal 75mm edge distance, or 9.5kN at a minimum 50mm, reducible to 50mm where suspended reinforcement transfers loads into the slab
- For reinforced concrete of minimum class C20/25, in standard 3000mm or short lengths
Fully compatible with ACS Masonry Support systems and CCPI-assessed
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Masonry Support CPD
ACS runs a RIBA-accredited CPD on masonry support systems covering when to specify bracket and angle vs continuous angle, fixing configurations across concrete, steel and cast-in channel substrates, cavity and movement detailing. Available online or in person. Book your place, or get in touch to arrange a session for your team.
Available online or in person. Book your place, or get in touch to arrange a session for your team.
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Technical Data Sheet
FAQs
How is 31/21 Axis Curve Channel different from a post-fix anchor system?
Axis Curve is cast into the concrete during the pour, so there’s no site drilling, cleaning or hole preparation required later. The T Head Bolt simply twists and locks into the channel, offering a faster, quieter installation with fewer health and safety risks than an expansion or chemical anchor.
What load capacity does Axis Curve Channel achieve?
Can the channel be used where edge distance is restricted
Yes. Where the nominal 75mm edge distance can’t be achieved, edge distance can be reduced to 50mm provided suspended reinforcement is installed to transfer loads into the surrounding concrete.
