Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 504877 found under Lagging Friction Co by West Salem Machinery Company. The National Stock Number assigned to this part is 2990009320869, and the Federal Supply Class is 2990 Miscellaneous Engine Accessories Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 504877.