Material: Made of carbon steel, oxidized black finished, good rust and corrosion resistance.
Feature: Design with thread inside, 4-slot slotted round nut.
Advantage: The pitch and spiral angle of the fine thread is smaller, which is more conducive to the self-locking, so the fine thread are generally used in places where it is necessary to prevent loosening.
Application: Widely used for roller bearing, axial shaft, pump valve, etc.