Castellated Nut - Thread: 5/16-24, Self-Locking Nut, Hexagon, Non-Metallic Insert, 250°,MS17825-5 Nut$5.80PriceQuantity*Add to CartReturn PolicyAll claims for error, shortage or damage must be made within 7 days after receipt of goods. Parts must be returned within 15 days. ShipmentEXW