Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HS077-30-1SS found under Gage Pressure Dial Indicating by Hydrodyne Industries Inc. The National Stock Number assigned to this part is 6685011924843, 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 HS077-30-1SS.