Grade C Nylon Insert Locknut Plain Finish

Grade C Nylon Insert Locknuts – High-Strength Locking for Heavy-Duty Applications

The Grade C nylon insert locknut with a plain finish is engineered for demanding fastening applications where strength, security, and vibration resistance are essential. Designed for fractional thread sizes, this locknut is manufactured from hardened carbon or alloy steel, providing the mechanical strength required for heavy-duty use in construction, transportation, agriculture, and industrial equipment.

Built for Strength and Vibration Resistance

The defining feature of this locknut is its integrated nylon insert, which creates prevailing torque by gripping the mating bolt threads. This locking action helps prevent loosening caused by vibration, shock, or dynamic loading. Compared to all-metal locknuts, nylon insert designs offer smoother engagement while still delivering dependable locking performance. When properly applied, these locknuts can often be reused a limited number of times without significant loss of holding power.

Grade C Performance for Critical Loads

The Grade C classification signifies a higher-strength steel construction, making these locknuts suitable for high-load and high-torque applications. They are commonly used in structural assemblies, heavy machinery, agricultural equipment, and transportation systems where fastener failure is not an option. This strength level ensures reliable performance under demanding operating conditions.

Plain Finish for Controlled Environments

With a plain, unplated finish, these locknuts are best suited for indoor or controlled environments where corrosion is not a primary concern. The absence of plating also makes them ideal for applications that require custom coatings, painting, or post-processing after installation.

Specifications and Features

• Type: Nylon insert hex locknut (prevailing torque)

• Grade: C, hardened steel for high-strength applications

• Finish: Plain (unplated)

• Thread Types: UNC and UNF

• Sizes: Commonly 1/4"-20 through 1"-8 and larger

• Locking Mechanism: Integrated nylon collar

• Standards: ASME B18.16.6, SAE J995

Rugged Locking You Can Rely On

For heavy-duty fastening that demands both strength and vibration resistance, the Grade C nylon insert locknut with plain finish delivers dependable performance without the need for additional locking devices. Need technical guidance or sizing help? Our fastener experts are ready to assist.