Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4189 found under Stud Shouldered by Sperre Industri A S. The National Stock Number assigned to this part is 5307251509621, and the Federal Supply Class is 5307 Studs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4189.