Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1528 found under Carbon Stock Electr by Sargent Welch Scientific Co. The National Stock Number assigned to this part is 5977004084122, 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 1528.