Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 53-870067-7 found under Sight Optical Display by Monogram Aerospace Fasteners Inc. The National Stock Number assigned to this part is 1270000641997, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 53-870067-7.