Metric fasteners, similar to inch fasteners in type and application, are measured in millimeters and often confused with inch types. Ensure to distinguish between inch and metric when replacing fasteners. Metric Nylon Insert Lock Nuts have a nylon insert. These locknuts are strong enough to use on most machinery and equipment that are prone to vibration and temperature changes.

The nylon insert also wont damage the threads on your bolt. These nuts are reusable, but their holding power lessens with each use. Class 8 zinc-plated fasteners are corrosion-resistant, suited for indoor and industrial use, made from medium carbon steel, and comparable in strength to SAE Grade 5.