Dorman 814-040 Hex Lock Nut with Nylon Insert Grade 2 1/4-28 Fine Thread

The Dorman 814-040 is a Grade 2 hex lock nut featuring a nylon insert locking mechanism, designed for secure, vibration-resistant fastening in automotive, marine, RV, and general-purpose applications. With a 1/4-28 fine thread pitch and a 7/16 in. height, this nylock nut provides a reliable hold without the need for thread-locking compounds.

The integrated nylon collar grips the mating bolt threads to prevent loosening caused by vibration, shock, or thermal cycling — making it ideal for high-movement assemblies. This nut meets Grade 2 strength standards for light-to-medium duty fastening applications.

Key Features:

• Thread Size: 1/4-28 (UNF fine thread)
• Grade: Grade 2
• Nut Height: 7/16 in.
• Locking Type: Nylon insert (prevailing torque)
• Manufactured to specific thread tolerance standards for consistent fitment
• Corrosion tested via salt spray testing to ensure long-term durability
• Suitable for automotive, home, and multi-purpose fastening applications
• Backed by Dorman's ASE Blue Seal Certified technical support team

Dorman's 814-series nylon lock nuts are a trusted solution for replacement and repair fastening needs across a wide range of platforms.