Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 553-6700 AND 553-6727 found under Bell Electrical by Emhart Industries Inc. The National Stock Number assigned to this part is 6350011759863, 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 553-6700 AND 553-6727.