High-Reliability Under-Head E-Self-Locking Nuts


Under high dynamic loads, continuous vibration, or extreme thermal expansion, traditional fasteners often suffer from self-loosening—leading to unexpected downtime or safety hazards. Engineered for the most demanding environments, our Under-Head Wing Self-Locking Nut features specially designed flexible wings under the nut flange. Upon tightening, these wings generate persistent preload and localized friction, creating a bulletproof locking mechanism that ensures long-term operational stability.

Key Product Features

  • Innovative Under-Head Wing Design: As torque is applied, the integral wings undergo controlled elastic deformation, locking firmly against the mating surface to withstand severe vibration and dynamic shock.

  • Non-Destructive & Reusable: Unlike chemical thread-locking adhesives or prevailing-torque nuts that can damage threads, our wing nuts retain consistent locking torque over multiple maintenance cycles without degrading bolt quality.

  • Streamlined Assembly: Eliminates the need for separate spring washers or flat washers. This one-piece design significantly speeds up assembly lines and simplifies your inventory stock-keeping units (SKUs).

Technical Highlights

  • Material Options: Carbon Steel (with various protective coatings) and Stainless Steel (SUS304 / SUS316) to suit diverse environmental conditions.

  • Size Range: Metric M4 to M20 / Imperial 1/4" to 3/4" (Custom sizes and pitches available upon request).

  • Surface Treatments: Zinc Plating, Dacromet, Geomet, or Hot-Dip Galvanizing, meeting stringent salt spray test standards for superior corrosion resistance.

  • Thread Precision: Complies with ISO 965 / ANSI B1.1 tolerance standards for seamless, galling-free installation.

Target Applications

  • Automotive & Heavy Equipment: Chassis assemblies, engine mounts, and off-highway machinery subjected to heavy vibration.

  • Renewable Energy & Transit: Wind turbine structures, solar racking systems, and railway infrastructure.

  • Industrial Automation: Conveyor systems, vibrating screens, and high-speed robotic machinery.

 2026-09-25