Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S3821 found under Ring Electrical Con by The Electric Tachometer Corp. The National Stock Number assigned to this part is 5977006445464, and the Federal Supply Class is 5977 Electrical Contact Brushes And Electrodes. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S3821.