Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 0A18440-28 found under Grommet Nonmetallic by Raytheon Company. The National Stock Number assigned to this part is 5325002496345, 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 0A18440-28.