Purchased inventory from auto mechanic shop.  These are brand new nuts.  

Product Description

A special nut used with a Camtainer bolt for Fiberglass Reinforced Panel attachments to trucks and trailers in M6 x 12.70mm length.

• FRPs are a high performance bolt and nut combination for fastening Fiberglass Reinforced Plywood (FRP) to steel framing rails in FRP trailer and body applications.
• They are designed to solve fastening problems unique to the truck/trailer industry.
• Cold formed and heat treated for greater structural strength – Grade 5.1
• 6-Lobe Drive flanged nut permits high torque and easy field service.
• Special molded collar provides positive sealing.
• Easy one-person installation without expensive tooling.
• Has positive high torque and excellent structural strength.
• Available in other sizes. Minimums may apply.
• Cross Reference #890-50000-297