Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P157-500 found under Resistor Variable Nonwire Wound Nonprecision by La Marche Mfg Co. The National Stock Number assigned to this part is 5905004071567, 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 P157-500.