Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 71728A found under Bearing Ball Linear Motion by Komatsu America Corp. The National Stock Number assigned to this part is 3110012385208, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 71728A.