Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BTD597 found under Stud Shouldered And Stepped by Columbia Research Laboratories Inc. The National Stock Number assigned to this part is 5307001095765, and the Federal Supply Class is 5307 Studs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BTD597.