Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ST 1228P012 found under Stud Stepped by Allison Transmission Holdings Inc. The National Stock Number assigned to this part is 5307011048261, 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 ST 1228P012.