Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A51B2572-12 found under Fitting Inboard Fla by J Smith Machine Shop Inc. The National Stock Number assigned to this part is 1560011090875, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A51B2572-12.