Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W-D-661 TY4 found under Drill Electric Portable by General Services Administration. The National Stock Number assigned to this part is 5130002042718, and the Federal Supply Class is 5130 Hand Tools Power Driven. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like W-D-661 TY4.