Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 29X4-1 found under Needle Sewing Machi by Singer Industrial Sewing Products Co. The National Stock Number assigned to this part is 3530008308923, 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 29X4-1.