NUT - CASTELLATED (Mitsubishi MB1B4439)

A damaged castellated nut can compromise the security of a pinned joint, leading to loosening under vibration. During inspection, a castellated nut may show wear on its slots, reducing its ability to accept a cotter pin. The nut's primary function is to secure a threaded fastener while allowing a locking pin to pass through its castellations. A common failure consequence is that a worn nut may allow the pin to shear, causing the assembly to separate. Keeping a castellated nut in sound condition helps maintain the intended preload on the fastener. This aftermarket replacement part references Mitsubishi as the OE maker and carries the cross-reference part number MB1B4439. Verify the serial number or application, then call (562) 693-7748.

Part number variants: MB1B4439, mb1b4439