Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4B9052 found under Seat Helical Compression Spring by Caterpillar Inc. The National Stock Number assigned to this part is 5340005235711, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4B9052.