Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MB-40 found under by Sunnen Products Company. The National Stock Number assigned to this part is 9150016044148, and the Federal Supply Class is 9150 Oil And Grease Cutting Lubricating And Hydraulic. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MB-40.