Carbon Steel Lock Nut, Zinc Plated Finish, Right Hand Threads, Self-Locking/Nylon Insert, Meets DIN 985, M4-0.70 Threads (Pack of 100)

Lock Nuts are commonly used when spinning of components would be a problem. They are designed to interlock with the locking surface for a secure hold, without slippage. Hex drive systems are driven with a wrench.

Steels are designated by a 4 number SAE Steel grade. The first two digits indicate the primary materials used to form the steel. The last 2 digits identify the percentage of carbon for the alloy (in hundredths). The steel used in these fasteners has a tensile strength ranging from 100,000 to 150,000 psi (pounds per square inch).

A threaded fastener's size name includes information about the major external diameter (in millimeters), followed by the thread pitch (millimeters per thread), which indicates if it is coarse or fine. Coarse threads are better when working with brittle materials; they are sturdier and are easier to thread and unthread compared to fine. Coarse threading also allows for thicker coatings and platings.