Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B2-3512 found under Lining Friction by Oil States Industries Inc. The National Stock Number assigned to this part is 3950007220174, and the Federal Supply Class is 3950 Winches Hoists Cranes And Derricks. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B2-3512.