18-8 Stainless Steel Keps K-lock Nut
K-lock Nut is also called Keps nut, the size is that of the bolt it is used it, e.g. a M4 nut fits a M4 bolt.
Hex Nut with assembled free spinning External Tooth Lockwasher. The lockwasher creates the locking feature against the bearing surface of the nut and the mating surface.
Specification
Size: M3
Material: Stainless Steel 304, A2, 18-8
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