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Sleeve couplers (also called external joiners or connecting sleeves) are heavy-duty pressed-steel scaffold connectors that join two scaffolding poles end-to-end to create longer runs of standards, ledgers or guardrails. Designed for the industry-standard 48.3 mm outer-diameter tube, each coupler measures approximately 300 mm in length, weighs 1.1 kg, and is zinc-plated for corrosion resistance. Two internal locking nuts (21 mm / 7/16″ spanner) secure the tubes with a slip-resistant grip, making these the go-to choice when you need a strong, straight-line extension on site.
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Sussex Depote
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We’ve supplied scaffolding contractors across the UK for years and know how important a reliable joint is when you’re working at height. These couplers give you a clean, load-bearing connection without the need for spigots or welding. They’re quick to fit, easy to inspect, and built to last through multiple projects. Whether you’re extending a tower, lengthening a runway or simply replacing a damaged fitting, our sleeve couplers get the job done safely and cost-effectively.
Feature | Details |
Material | Pressed steel, zinc-plated or galvanised |
Compatible tube OD | 48.3 mm (standard scaffolding tube) |
Overall length | ≈ 300 mm |
Weight | ≈ 1.1 kg |
Locking mechanism | Two internal nuts (21 mm / 7/16″ spanner) |
Finish | Zinc-plated for corrosion resistance |
Standard | BS EN 74 Class B compliant |
Once extended with sleeve couplers, connect your longer ledgers or standards securely to the rest of the structure using our double couplers for reliable 90° load-bearing joints at every intersection.
Every sleeve coupler we stock meets BS EN 74 Class B requirements, the British and European standard for scaffold couplers. When fitted correctly, with equal tube overlap on both sides and nuts tightened to the manufacturer’s recommended torque, they provide excellent resistance to slip and pull-out. Always use a 21 mm scaffold spanner (never an adjustable one) and never over-tighten to avoid damaging the tube. Regular visual checks for deformation or worn threads keep your scaffold safe throughout its life.
It slides over the ends of two 48.3 mm scaffold tubes and locks them together in a straight line, allowing you to extend any part of the scaffold safely.
Yes, they work equally well on ledgers, guardrails and diagonal braces.
A sleeve coupler is an external fitting that wraps around the tubes; a joint pin is an internal spigot that sits inside the tubes. Sleeve couplers are generally preferred for heavier-duty or longer extensions.
A standard 21 mm (7/16″) scaffold spanner fits the locking nuts perfectly.
Yes. The zinc plating (or galvanised finish) gives good protection against rust, especially when stored off the ground between jobs.
When installed to EN 74 Class B standards, they are fully load-bearing for normal scaffolding duties (workers, materials and wind loads).
Do you need a bulk quote or want to check stock for your next job? Just give us a call, we’re here to help you keep your scaffold safe and on schedule.
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