Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5R-9111 ITEM 33 found under Microcircuit Memory by Caterpillar Inc. The National Stock Number assigned to this part is 5962013617488, and the Federal Supply Class is 5962 Microcircuits Electronic. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5R-9111 ITEM 33.