... sizes17mm, 19mm, 21mm, 22mm, 23mmCertificationISO9001:2000, CE, SGSBritish Type Scaffolding Single Coupler with EN74/BS1139 :1) Material: Q235 ... kinds of scaffolding couplers, includes German type, American type, Australian Type, Japanese type, Korean type, British type, and so on. All the ... load limit of 6.25kn against slip at tightening torque of 54nm. 7.can be used to resist tension or compression ...