Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11B SF 2 found under Coupling Shaft Flexible by Tb Woodss Corporation. The National Stock Number assigned to this part is 3010001174568, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 11B SF 2.