Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9J-4259 found under by Caterpillar Inc. The National Stock Number assigned to this part is 3815013933541, and the Federal Supply Class is 3815 Crane And Crane Shovel Attachments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 9J-4259.