Best Seller 4-40 Lock Nuts Nylon Insert Steel Zinc Plated (100 / Pkg.)

Hex Lock Nuts Nylon Inserts Steel Zinc 4-40 are built for reliability in a variety of applications. The combination of a steel hex nut, a durable nylon locking insert, and a zinc finish delivers dependable locking action that resists vibration and loosening in compact assemblies.

Key Features

Locking action: Nylon insert grips the bolt as it is tightened, creating a secure lock that resists vibration and prevents loosening.

Material and finish: Steel with a durable zinc plating for corrosion resistance and longer service life in everyday environments.

Thread size: 4-40 UNC, ideal for small, precision hardware projects and electronics applications.

Head style: Hex nut design for easy installation and removal with standard wrenches.

Nylon insert: Provides additional locking capability without requiring special tools or coatings.

Industries & Applications

Electronics enclosures and electrical assemblies

Precision machinery and instrumentation

Automotive interiors and dashboards

Robotics and hobbyist projects

Small appliances and general hardware assemblies

Specifications

Thread size: 4-40 UNC

Material: Steel

Finish: Zinc plating

Locking insert: Nylon

Head style: Hex