Grade C All Metal Cone Locknut Zinc/Wax Cr3 Plating

The Grade C all metal cone locknut with Zinc/Wax Cr3 plating is a high-strength, vibration-resistant fastener designed for the most demanding structural and industrial applications. Built with a cone-shaped top and a prevailing torque all-metal design, this locknut delivers secure, reliable fastening—without the use of nylon inserts—making it perfect for high-heat, high-vibration, and high-load environments.

The Grade C classification means these locknuts are manufactured from hardened steel with enhanced mechanical properties, offering superior tensile strength and durability. They are commonly used in heavy machinery, structural steel connections, bridges, power generation equipment, rail systems, and construction applications where failure is not an option.

What sets this version apart is its Zinc/Wax Cr3 plating—a trivalent chromium (Cr3) zinc finish enhanced with a wax topcoat. This coating combination delivers outstanding corrosion resistance and low friction during installation, helping prevent galling and ensuring consistent torque values. The RoHS-compliant plating also offers long-term protection in moderately corrosive or outdoor environments without the environmental concerns associated with hexavalent chromium.

Specifications include:

• Type: All metal cone locknut

• Grade: C (per SAE J995) – high-strength carbon steel

• Finish: Zinc/Wax Cr3 (trivalent chromium + lubricant)

• Locking Mechanism: Prevailing torque via deformed threads

• Thread Type: Inch (UNC/UNF)

• Sizes: Typically from 1/4"-20 up to 1"-8 and larger

• Standards: ASME B18.16.6, SAE J995

Whether you're bolting down a critical structure or assembling rugged equipment, the Grade C cone locknut with Zinc/Wax Cr3 offers strength, corrosion protection, and torque control that professionals rely on.

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