5/16-18 X 3" Long Hex Coupling Nut This item was sourced on www.MFG.com as one of the items in an RFQ in USA for Coupling Nuts Buyer is in search of a 5/16-18 X 3" Long Hex Coupling Nut (Coupling Nuts). Please see drawing for all specifications. Part Part Number: 1453994442379 Material: Alloy Steel Material Grade: Technical Specifications Category:Coupling Nuts Dimensions0.625 x 3.0 inch Tolerance:0.005Annual Usage:1000.0 Are you looking for suppliers (machine shops, fabricators, casters, molders, 3D printing, CNC machining, etc.) to provide manufacturing services for machine tool industry, automotive industry? For more information visit MFG.com. MFG.com performs a 5-point inspection on all engineered parts and RFQs to ensure quality and enhance your online quoting experience Coupling Nuts: Coupling nuts are used connect two lengths of threaded rods together.