Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3-1-1XL ITEM 4 found under Bushing Sleeve by The Hilliard Corporation. The National Stock Number assigned to this part is 3120011299897, 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 3-1-1XL ITEM 4.