Value Collection CNFI5137-010BX Castle Lock Nut 1-3/8-12

Product Description

The VALUE COLLECTION CNFI5137-010BX is a castle lock nut designed for high-load fastening applications where positive locking with a cotter pin or safety wire is required. Manufactured from Grade 5 steel with a bright, uncoated finish, this nut meets ANSI B18.2.2 standards for dimensional accuracy and mechanical performance. The castellated crown features evenly spaced slots that align with a drilled fastener shaft, allowing a cotter pin to be inserted and preventing rotation under vibration or dynamic loading. It carries a 1-3/8-12 thread size with right-hand thread direction, making it suitable for medium-to-heavy duty mechanical assemblies across industrial and trade applications.

Castle lock nuts in this size range are commonly found in shaft and bearing retention applications, agricultural equipment, industrial machinery, and heavy mechanical assemblies. They are installed by machinists, millwrights, maintenance technicians, and mechanical contractors where a positive, inspectable locking method is preferred over friction-only locking fasteners. The 1-3/8-12 thread pitch indicates a fine-thread configuration, which provides greater thread engagement per inch and is well-suited for precision fits or assemblies subject to cyclic loading.

Key Features

• Castellated design accepts a cotter pin or safety wire for positive, inspectable locking
• Grade 5 steel construction for reliable mechanical strength in demanding applications
• 1-3/8-12 fine-thread, right-hand configuration for precision thread engagement
• Bright, uncoated finish suitable for applications where coating compatibility is a factor
• Conforms to ANSI B18.2.2 dimensional standards for consistent fitment

Compatibility

Designed as a standard ANSI B18.2.2 castle lock nut for use with any 1-3/8-12 right-hand threaded shaft or fastener in inch-measurement mechanical assemblies.

Installation Notes

Installation should be performed by a qualified mechanic or millwright familiar with fastener torque procedures and cotter pin installation. Always ensure the mating shaft or bolt has a properly drilled cotter pin hole aligned with the nut slots before final tightening. Insert a correctly sized cotter pin through the slot and shaft hole and bend the ends to secure. Inspect the cotter pin for fatigue or deformation at each service interval.