Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 509275-4180 found under Housing Mechanical Drive by Kessler Intl Corp. The National Stock Number assigned to this part is 2520016571242, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 509275-4180.