Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 52-D-642-1 found under Brush Holder Assembly by Engineered Arresting Systems. The National Stock Number assigned to this part is 1710003134151, 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 52-D-642-1.