Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5S3975 found under Wheel Turbocharger by Caterpillar Inc. The National Stock Number assigned to this part is 2950012716342, and the Federal Supply Class is 2950 Turbosupercharger And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5S3975.