Black carbon steel merchant coupling with full thread material:carbon steel Size:1/8"- 6" MOQ:2000 Pcs, ... sockets, merchant coupling, hose coupling, hose mender,king nipples, full thread couplingProduct: steel sockets/steel merchant coupling/steel coupling/carbon steel ... to BS EN10241, ASTM A 865, DIN 2986, the thread refers internal parallel thread.5) Size available from 1/8" to 6"We ...