Core Performance Indicators and Quality Standards for Scaffold Couplers
Mar 18,2026
The quality of scaffold couplers directly affects the safety of scaffold structures. The current implementation standard in China is GB 15831-2016 "Steel tube scaffold couplers" . This standard specifies specific mechanical performance requirements for different types of couplers: right-angle couplers should have no destructive slippage under 15kN anti-slip load, with anti-destructive load not less than 25kN; swivel couplers should have rotation angle not exceeding 5° under 15kN tension, with anti-destructive load not less than 25kN; sleeve couplers should have axial displacement not exceeding 5mm under 30kN tension load, with anti-destructive load not less than 40kN . The tightening torque requirement for coupler bolts is 40-65N·m, maintaining no loosening for 1 minute . Regarding appearance, coupler components should have no cracks, with blowhole diameter not exceeding 3mm, depth not exceeding 2mm, and quantity not exceeding 3 . For materials, couplers should be manufactured from malleable iron with mechanical properties not less than KTH330-08 grade or ZG230-450 cast steel .
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