Qualfast: 5/16 BSW Hex Nut BZP (GR-8) BSW. Zinc-Plated. Conform to BS 1083. Grade A. MPN: 5/16 BSW Hex Nut BZP (GR-8) Attributes: Box Quantity: 250 Driving Features: Hexagon Grade: A Material: Steel Surface Treatment: Plain Thread: BSW Thread Direction: Right Thread Size: 5/16