Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 511B7-4 found under Clamp Loop by Paragon Precision Inc. The National Stock Number assigned to this part is 5340002228578, 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 511B7-4.