Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CN3115R-2-21 found under Thread Guard Needle Bar by Consolidated Sewing Machine Corp. The National Stock Number assigned to this part is 3530003597549, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like CN3115R-2-21.