Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R8639718 found under Slide Directional Control Linear by Ww Williams Logistics Llc. The National Stock Number assigned to this part is 4820012126763, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R8639718.