All Metal Locknuts

All Metal Locknuts – High-Strength Fastening for Extreme Conditions

All metal locknuts are rugged, vibration-resistant fasteners engineered for secure, long-lasting performance in high-stress environments. Unlike nylon insert locknuts, these fasteners rely entirely on mechanical deformation to create their locking action. This design makes them the ideal choice for applications involving high temperatures, constant vibration, heavy loads, or chemical exposure, where nylon inserts can soften, degrade, or fail.

Why Choose All Metal Locknuts?

The key advantage of all metal locknuts is their ability to maintain full locking strength under extreme conditions. Because there are no plastic components, these locknuts perform reliably in elevated temperatures and can typically be reused more consistently than nylon insert alternatives. Their metal-to-metal locking action provides dependable resistance to loosening caused by vibration, shock, or thermal cycling.

Common Applications

All metal locknuts are widely used in aerospace, automotive, heavy machinery, construction equipment, and industrial manufacturing. They are trusted for securing engine components, structural steel connections, rotating equipment, and critical assemblies where failure is not an option. In environments where safety and durability matter most, all metal locknuts deliver confidence and performance.

Types of All Metal Locknuts

Several styles are available to suit different applications:

• Prevailing Torque Locknuts – Including top lock and center lock designs that use controlled thread interference

• Elliptical or Deformed Thread Locknuts – Provide consistent torque retention

• Wedge and Serrated Locknuts – Use bearing surface grip to resist rotation

Each design offers a reliable mechanical locking method without relying on inserts or adhesives.

Specifications

• Materials: Carbon steel, alloy steel, stainless steel (18-8, 316)

• Finishes: Zinc plated, galvanized, black oxide, plain

• Thread Types: UNC, UNF, metric coarse, metric fine

• Sizes: #6-32 to 1-1/2", M3 to M36

• Standards: ASME B18.16.6, DIN 980, ISO 7040

Built for When Failure Is Not an Option

From heavy equipment to structural frameworks, all metal locknuts provide unmatched resistance to vibration, loosening, and thermal breakdown. Looking for bulk quantities, stainless options, or a specific standard? Our team is ready to help you select the right locknut for your application.