China Two Grooves Double Head Connecting Nut /Groove Nuts DIN 70852-1989/Prevailing Torque Type Hexagon Domed Cap Nuts with Non-Metallic Insert DIN986-2000, Find details about China Fasteners, Hardware from Two Grooves Double Head Connecting Nut /Groove Nuts DIN 70852-1989/Prevailing Torque Type Hexagon Domed Cap Nuts with Non-Metallic Insert DIN986-2000