The custom steel machining parts are the bottom bracket, which was used in the testing instrument. The material is carbon steel (AISI 1020), and the finish is grinding. For the steel machining mechanical parts, MOQ is 2000 PCS and the lead time is 30 days. The tight tolerance of the steel machining instrument parts is +/-0.02mm, the surface roughness is Ra 0.8. JST has over 30 machining center, we could make all kinds of custom steel machining mechanical parts in house. If you have any inquiry for the custom steel machining instrument parts, please do feel free to contact us for quotation and JST will be your right choice.