Lock Nut, Finish Plain, Material Stainless Steel, Material Grade/Class 18-8, Thread Size #6-32, Hex Width 5/16 in, Hex Height 3/16 in, Lock Type Nylon Insert, Dimensional Standards ASME B18.16.6, System of Measurement Inch, Hex Type Jam Hex, Thread Direction Right Hand, Pack Size Small Pack, Package Quantity 50 Thin hex locknut with nylon insertresists loosening caused by vibration and holds mating parts in any position. Nylon insert withstands temperatures up to 250 Degrees F. Meets IFI 100/107 standards.