Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31-13-P12 found under Stud Plain by Textron Lycoming Inc. The National Stock Number assigned to this part is 5307002163070, 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 31-13-P12.