Specification Brand : HobbyStar BulletPoint1 : HobbyStar aluminum fasteners are manufactured with 7075 aluminum for strength, and feature both nylon locks and deep, sharp serrations to ensure they do not come off in the heat of action. BulletPoint2 : Pack of 4 nuts. BulletPoint3 : Lightweight and Durable 6061-T6 Aluminum Alloy BulletPoint4 : Excellent Corrosion Resistance and Strength-to-Weight Ratio BulletPoint5 : Non-Magnetic Color : Yellow DriveSystem1 : External Hex DriveSystem2 : Cross ExteriorFinish : Aluminum,Nylon ExternallyAssignedProductIdentifier1 : 0688977147302 ExternallyAssignedProductIdentifier2 : 688977147302 FinishType : Oil Rubbed ItemName : HobbyStar Aluminum Lock Nut, Serrated, M4, Yellow, 4pk ItemPackageQuantity : 1000 ItemShape : Hexagonal ItemTypeKeyword : hardware-locknuts Manufacturer : HobbyStar Material : Aluminum MeasurementSystem : English/Standard MetalType : Aluminum ModelNumber : Nylon Insert Lock Nut NumberOfPieces : 1000 PartNumber : MK5491 ProductDescription : A nylon insert lock nut is hex shaped, internally threaded with a nylon insert. The nylon material prevents loosening from vibration and cross threads to stop the nut from backing off of the fastener. The insert deforms elastically over the threads of the screw, but threads are not cut into the nylon. The nylon insert locks the nut in two ways. First, it forces the bottom face of the screw threads against the top face of the nut threads, increasing the friction between the two. Second, the nylon applies a compressive force against the screw itself. ProductSiteLaunchDate : 2018-12-20T19:54:42.968Z Size : #10-32 Style : Nylon Insert Lock Nut UnspscCode : 31161700