Collars
Collars
HI-SHEAR Fasteners
Miscellaneous Fasteners
NAS Fasteners
Pins
Collars
Collars are used throughout aircraft assembly and maintenance, including wing skins, fuselage frames, engine nacelles, control surfaces, landing gear, and interior structural modules. Swage and Hi-Lok collars in wing-to-spar connections can improve fatigue life and reduce rework, while Hi-Lok fasteners and the Hi-Lite fastener line deliver reliable, lightweight performance.
AIAP provides certified aerospace collars, technical guidance, and responsive supply programs to enhance safety, accelerate turnaround, and maintain compliance—positioning us as a trusted leader for Hi-Lok, Hi-Lite, and Hi-Tigue collars, along with OEM specifications such as BACC, ABS, and more.
Types of Aerospace Collars
- Frangible collars – Designed to break off at a specific torque, ensuring consistent clamp load and a seamless finish. They provide reliability in installation but are single-use and demand precise torque control.
- Swage collars (lockbolt systems) – These collars plastically deform onto grooved pins to create high-strength, vibration-resistant joints. Known for their excellent fatigue resistance and quick installation, they require specialized tools.
- Hi-Lok, Hi-Lite, and Hi-Tigue collars – These collars offer controlled torque, lightweight design, and simplified installation. The Hi-Lok system and the Hi-Lite fastener option are prevalent in airframes focused on repeatability and weight reduction, with Hi-Tigue providing enhanced fatigue life.
- Pin-rivet collars – Utilized with structural rivets and clevis pins, these collars ensure robust shear and bearing performance in thin-gauge assemblies.