Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7S3174 found under Shaft Shouldered by Caterpillar Inc. The National Stock Number assigned to this part is 3040004096348, 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 7S3174.