APM Fasteners is a division of APM HEXSEAL

APM Fastener Division was founded in 1947, with the dedicated mission of providing high-pressure sealing solutions for industry and the military.

APM immediately began to develop and patent a wide variety of self-sealing fastening products; self-sealing screws, bolts, rivets, nuts and washers. Each of these share a common characteristic of one-piece design with the ability to be reused multiple times in field maintenance.

APM’s patented one-step, embedded O-Ring design requires no sealing adhesives or liquid sealants, and has proved to be superior in providing high-pressure sealing to 20,000 psig (137,895kPa). Previous techniques, such as deformable washers and conventional O-Rings could not achieve full torque (see Comparison Chart). The APM embedded technique easily allows full 360º metal-to-metal surface contact sealing and torqueing. Where applications are subject to excessive vibration, various threadlocking add-ons are available, as well as many tamper-resistant style heads. Millions are in use throughout the world and are frequently found in the most hostile environments.

APM continues to be the leader in self-sealing fastening technology through their commitment to innovative fastening-sealing solutions.

Involved in electrical/electronics equipment-controls reliability
(switch, circuit breaker & potentiometer sealing boots)?
Visit the APM HEXSEAL website for other challenging sealing solutions.

The APM line of self-sealing fasteners includes self-sealing screws, self-sealing locking nuts, self-sealing locking bolts, self-sealing rivets, and self-sealing washers all designed to seal in/out air, water, lubricants and other liquid or gaseous contaminants.