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.