Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4020-0000 found under Clamp Tube by Smiths Detection Watford Ltd. The National Stock Number assigned to this part is 5340997939310, 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 4020-0000.