Qualfast: 5/16 UNF Hex Nut BZP (8) Zinc-Plated. Metric - conform to DIN 934. BSW - conform to DIN 970. UNC - conform to DIN 971. UNF - conform to DIN 555. MPN: 5/16 UNF Hex Nut BZP (8) Attributes: Box Quantity: 200 Driving Features: Hexagon Grade: 8 Material: Steel Surface Treatment: Zinc Plated Thread: UNF Thread Direction: Right Thread Size: 5/16