Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CA1728-2 found under Stud Turnlock Fastener by Siemens Corp. The National Stock Number assigned to this part is 5325004980856, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like CA1728-2.