Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HS-3552-B-8 1 2-12-F205 found under Probe Assembly Humidity by Hy Cal Engineering. The National Stock Number assigned to this part is 6685012123972, 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 HS-3552-B-8 1 2-12-F205.