Grade C All Metal Cone Locknut Zinc/Wax Cr3 Plating

Grade C All Metal Cone Locknuts – High-Strength Locking for Critical Applications

The Grade C all metal cone locknut with Zinc/Wax Cr3 plating is engineered for maximum strength, vibration resistance, and reliability in the most demanding structural and industrial environments. Featuring a cone-shaped top and an all-metal prevailing torque design, this locknut delivers consistent locking power without relying on nylon inserts—making it an excellent choice for high-heat, high-vibration, and high-load applications.

Designed for Extreme Performance

Grade C cone locknuts are manufactured from hardened high-strength carbon steel, meeting the rigorous requirements of SAE J995 Grade C. The cone top creates controlled thread interference, generating strong prevailing torque that resists loosening from vibration, shock, and thermal cycling. Because the locking action is entirely metal-to-metal, these locknuts maintain performance where nylon-insert alternatives simply cannot.

Where Grade C Cone Locknuts Are Used

These heavy-duty locknuts are widely used in structural steel connections, bridges, heavy machinery, rail systems, power generation equipment, and construction assemblies. When failure is not an option and joint integrity is critical, Grade C cone locknuts provide the confidence engineers and contractors demand.

Zinc/Wax Cr3 Plating Advantages

What truly sets this locknut apart is the Zinc/Wax Cr3 plating. This finish combines trivalent chromium zinc plating with a wax lubricant topcoat, offering two key benefits: excellent corrosion resistance and reduced friction during installation. The wax coating helps prevent galling, ensures smoother tightening, and promotes more consistent torque values. In addition, Cr3 plating is RoHS-compliant, making it a safer and more environmentally responsible alternative to traditional Cr6 finishes.

Key Specifications

• Type: All metal cone locknut

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

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

• Locking Mechanism: Prevailing torque via deformed threads

• Thread Types: UNC and UNF

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

• Standards: ASME B18.16.6, SAE J995

Built to Hold Under Pressure

For critical structures and rugged equipment, the Grade C cone locknut with Zinc/Wax Cr3 plating delivers unmatched strength, corrosion protection, and torque control. Need help with sizing or technical specs? Our team is ready to support your project.