Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 71913B4 found under Bearing Ball Annular by Skf Usa Inc. The National Stock Number assigned to this part is 1680015469784, and the Federal Supply Class is 1680 Miscellaneous Aircraft Accessories And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 71913B4.