Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NDC00005-4438-32 found under Trihexyphenidyl Hyd by American Cyanamid Co. The National Stock Number assigned to this part is 6505011607721, 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 NDC00005-4438-32.