Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 28623-01 found under Bolt Assembled Washer by Trimark Corporation. The National Stock Number assigned to this part is 5306015913869, and the Federal Supply Class is 5306 Bolts. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 28623-01.