Thread: 5/16-24, self locking, reduced hexagon, reduced height, corrosion and heat resistant steel, silver plated, MS21043 series nutMS21043-5 NUT SELF LOCKING$2.30PriceQuantity*Add to CartPRODUCT INFO Nut Style: Hexagon Locking Feature: Prevailing torque, all-metal design Material: Iron Alloy 660 Material Specification: AMS 5525 or AMS 5735 Precious Material & Location: Silver coating on external surface Surface Treatment: Silver plating Surface Treatment Specification: QQ-S-365 or AMS 2410 Thread Size: 0.312 inches Thread Series: UNJF (fine thread with controlled external root radius) Thread Class: 3B Thread Direction: Right-hand Threads per Inch (TPI): 24 Temperature Rating: 800°F Lubrication: Soluble lubricant Overall Height: 0.251 – 0.266 inches Width Across Flats: 0.367 – 0.378 inches Washer Outside Diameter: 0.520 inches Washer Thickness: 0.023 inches RETURN & REFUND POLICYAll claims for error, shortage or damage must be made within 7 days after receipt of goods. Parts must be returned within 15 days. SHIPPING INFOEXW