Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6L6121 found under Resistor Adjustable by Caterpillar Inc. The National Stock Number assigned to this part is 5905000091230, 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 6L6121.