Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7S6139 found under Connecting Link Rig by Caterpillar Inc. The National Stock Number assigned to this part is 3040012540310, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 7S6139.