ESNA is the pioneer manufacturer of self-locking fasteners. One can benefit from their 75 years of experience in the design and manufacturing of vibration and impact-proof fasteners. The Red Nylon insert, Eslok (nylon patch), and Collarlock provide three distinct options for the design and use of the lock nuts. The extensive ESNA line includes standards, high tensile, extra thin and Military approved, designed for the most difficult fastening applications. ESNA has also created full lines of miniaturized self-locking parts for the electronic industry. ESNA's manufacturing runs from high-speed cellular cold forming, to screw machined nuts, precision ground screw machine components and precision gear hobbing.