The US is one of the only countries using the Imperial SAE sizing system for nuts, bolts, screws, washers, etc. The rest of the world uses the metric system. Metric sizes should be abundant and CHEAP! I found otherwise looking for exact types & sizes for an import auto restoration project. I also learned the hard way about hardness grading.
[https://www.indiamart.com/vishnuproducts/] Established in the year 1998 as a sole proprietorship firm, we, “Vishnu Products” are a trusted name engaged in manufacturing, trading and supplying a comprehensive range of Door and Window Accessories. Under this range, we are offering Door Aldrops, Door Latches , Designer Door Handles, Fancy Door Handles, Window Handles, Door Stoppers, Stainless Steel Tower Bolts. In addition to this, The offered range of doors handles & stoppers is manufactured by our expert professionals using premium quality raw material, procured from the authorized and reputed vendors of the market.