What is the qualified torque for steel pipe fasteners?

[MacRuth]

Steel pipe fastener torque generally ranges between 40-50. The commonly used fasteners in China are made of cast iron, and their mechanical properties should comply with the "Steel Pipe Scaffold Fasteners" (GB15831-2006) standard, with material quality not lower than KT330-08. There are three types of fasteners: right-angle fasteners, butt fasteners, and swivel fasteners. They are packaged in woven bags, with 25 pieces per bag. Each fastener should weigh 1.1KG (including bolts and nuts). They are used in conjunction with scaffold pipes. Generally, the production and procurement ratio of fastener products is 8:1:1, meaning right-angle fasteners account for 80%, butt fasteners 10%, and swivel fasteners 10%.