Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number JWL501 found under Resistor Variable W by Central Lab Mfg Co. The National Stock Number assigned to this part is 5905009979537, and the Federal Supply Class is 5905 Resistors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like JWL501.