Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 507055 found under Roller Linear Rotar by Horst Engineering And Manufacturing. The National Stock Number assigned to this part is 3120008082185, and the Federal Supply Class is 3120 Bearings Plain Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 507055.