Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BT68502-01125 found under Gage Differential Dial Indicatin by Engineered Products Co. The National Stock Number assigned to this part is 6685015180596, 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 BT68502-01125.