These fasteners can be used for clearance, or low interference fit throughout aircraft, from wings to fuselage, in engine fairings, and more. Combined with HI-LITE™ nuts and collars, they provide up to 13% weight saving compared to the previous HI-LOK™ generation.

HI-LOK is a simple two-part fastener engineered to achieve in one all-purpose system the design features suiting many of today’s aerospace assembly needs. Consistent torque on each fastener installed is achieved through the integrated functions of the system working together.

Hi-lok collars are used in conjunction with hi-lok head pins to form a secure joint through the use of a the 2 threaded pieces. Designed for specific applications the new threaded hi-lok systems are easier to install and maintain with less special tooling needed.

Hi-Lok pins serve a similar function to aircraft bolts, providing high shear and tensile strength fastening, but their preload consistency removes the need for torque inspection. Aero Fastener stocks a wide variety of aircraft hi-lok pins. Browse our selection of aerospace hi-lok pins today! Same-day shipping available.

The Hi-Lok ™ fastener is versatile and can match the best qualities of a bolt/nut or pin swaged collar. Therefore, tooling is easily adaptable to large-scale production with high-speed equipment and automatic collar feed attachments.

Wide selection: Sierra Pacific Supply offers a diverse range of Hi-Lok fasteners to ensure you find the perfect match for your application. Quality assurance: We supply Hi-Lok fasteners that adhere to rigorous industry standards such as AN, MS, NAS, and NASM, ensuring dependable performance and reliability.

The Hi-Lok® is a threaded fastener that incorporates a hex key in the threaded end to react to the torque applied to the collar during installation. The collar includes a frangible portion that separates at a predetermined torque value.

The HI-LOK™ fastening system comprises two components: a threaded pin and a threaded collar, effectively blending the benefits of a rivet and a bolt-nut system. The system’s automatic breakoff design eliminates the need for torque inspection, streamlining the installation process and improving efficiency.

Hi-Lok is the industry standard for high strength, permanent airframe fasteners. The Hi-Lok fastening system combines the best features of a rivet and a bolt to create a high strength fastener with a one-sided installation, and light weight.

Howmet Fastening Systems produces a complete line of Pin Fastening Systems, including alloy steel and titanium Hi-Lok fasteners, Eddie-Bolt pin fasteners, threaded fasteners and more.