Simmonds is the inventor and manufacturer of The Nylstop®, the nylon-ring, self-locking nut.

The Simmonds line includes a range of nuts, and customized cold-forged and screw-machined parts made to match your specifications.

The Simmonds standard range of nuts is based around the original Nylstop self-locking nut, renowned for its performance and reliability. Following large scale investment, Simmonds have evolved their capability to include production of innovative, high-precision bespoke nuts, cold forged specials and high precision screw machined parts, all available in a wide range of materials and coatings.