This document specifies, for right angle couplers, swivel couplers, sleeve couplers and parallel couplers working by friction: — materials; — design requirements; — strength classes with different structural parameters including values for resistance and stiffness; — test procedures; — assessment; and gives: — recommendations for ongoing production control. These couplers are intended for use in temporary works equipment for example in scaffolds erected in accordance with EN 12811 1 and falsework erected in accordance with EN 12812.