1. klfs.pl [accessed 18 April 2021].
2. IATF 16949:2016 - Automotive Quality Management System Standard.
3. ISO 9001:2015 - Quality management systems — Requirements.
4. EN ISO 4759-3:2000 - Tolerances for fasteners. Plain washers for bolts, screws and nuts. Product grades A and C.
5. ISO 898-1:2013 - Mechanicalproperties of fastenersmade of carbonsteel and alloysteel — Part 1: Bolts, screws and studs with specifiedpropertyclasses — Coarsethread and fine pitchthread.