Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C78121-24 found under Shaft Straight by Short Thomas A Co. The National Stock Number assigned to this part is 3040012921588, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like C78121-24.