Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K840-AZ42 found under Mountresilientutility by Karman Rubber Company Inc. The National Stock Number assigned to this part is 5340016862746, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like K840-AZ42.