Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 843-03-PL REF DES R4 R5 found under Resistor Fixed Wire Wound by Pivotal Power Inc. The National Stock Number assigned to this part is 5905015263430, 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 843-03-PL REF DES R4 R5.