Coupler Types
Swivel, double / right-angle, sleeve, putlog, beam clamps and accessory couplers — what each does and where it is used.
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Scaffolding Coupler Types and Names: Chart of UK and US Names, Uses and EN 74 Classes
Scaffolding coupler types by name: double, swivel, parallel, sleeve, joint pin, putlog and beam clamp, with UK and US names, uses and EN 74-1 classes.
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Scaffold Beam Clamp (Girder Coupler): What EN 74-1 Covers and What to Ask
What a scaffold beam clamp or girder coupler is, why BS EN 74-1:2022+A1:2025 has no load table for it, and what to ask a supplier before ordering.
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Sleeve Coupler vs Joint Pin (Spigot): Which Standard Covers Which
How a sleeve coupler and a joint pin differ, what BS EN 74-1:2022+A1:2025 requires of the sleeve coupler, and which document covers the spigot pin.
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Double Coupler (Right-Angle Clamp): EN 74-1 Classes A/AA/B/BB and What They Require
What a double / right-angle coupler does, what BS EN 74-1:2022+A1:2025 Table 8 requires of classes A, AA, B and BB, and what to write on the order.
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Swivel Coupler (Swivel Clamp): Load Requirements, Weight and Swivel vs Double
Scaffold swivel coupler: what it does, BS EN 74-1:2022+A1:2025 Class A and B type-test values (not working loads), weight per piece, and swivel vs double.
Standards & Load Ratings
BS 1139, EN 74 classes A/B, slip and failure loads, weights and dimensions, pressed vs drop-forged.
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Class A vs Class B Couplers under BS EN 74-1:2022+A1:2025: What the Class Means and How to Prove It
What Class A and Class B mean for each coupler type in BS EN 74-1:2022+A1:2025, who sets the class, and which documents support it beyond a stamped mark.
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BS 1139 vs EN 74: How the Scaffold Coupler Standards Relate and What to Specify
How BS 1139 and EN 74 relate, from BS 1139-2.1:1991 to BS EN 74-1:2022+A1:2025, what changed in the coupler tables, and what to write on an order.
Tube & Fitting Systems
How tube-and-clamp (US) / tube-and-fitting (UK) scaffolding goes together, and the names buyers use in each market.
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Tube and Fitting Scaffolding (Tube and Clamp): Parts List, Names and How It Connects
Tube and fitting, tube and coupler, tube and clamp: one system of loose tubes and couplers. Parts list, names by market and which coupler goes where.