Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 88-00138-0301 found under Thread by Raytheon Company. The National Stock Number assigned to this part is 8310015236394, and the Federal Supply Class is 8310 Yarn And Thread. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 88-00138-0301.