Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HCS2051-01-005 found under Gauge Vacuum Standard by Heatcon Composite Systems Inc. The National Stock Number assigned to this part is 4920015886090, 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 HCS2051-01-005.