Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 644-1-5187 found under Heating Element Electrical Immer by Foremost Industries Lp By Itsgeneral. The National Stock Number assigned to this part is 4540003634172, 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 644-1-5187.