Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 581A found under Threading Machine Pipe And Bolt by Teledyne Landis Oster. The National Stock Number assigned to this part is 3419004124525, and the Federal Supply Class is 3419 Miscellaneous Machine Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 581A.