Fabryka Elementów Złącznych FEZ S.A ( Fastening Elements Factory FEZ ) is a large company which produces fastening hardware in Poland. It is one of the oldest and biggest factories in Siemianowice Śląskie and one of the oldest producer in Poland that still and incessantly producing. It was founded in 1868 as Nieten Fabrik by metallurgist Hugo Wilhelm Fitzner. Initially it comprised a craft-manufactory workshop specialising in the production of screw, rivets and nuts. From 1999 the company has been functioning as a joint stock company.
Factory is specialized in production fastering elements like bolts, nuts spring rings, spring clamps and other hardware for rail fixation and also elements for heading support used in mining. FEZ S.A. is one of rare factories that produce bolts in process of hot forging.