The Bossard BN813 M5 is an internally threaded steel insert nut, or nut insert, for plastic. It is composed of a steel body with a hex head, an internal thread, and a break-away plastic collar. The plastic collar is designed to break away when the insert is installed with the proper amount of torque. The BN813 has a metric thread size, M5. It is suitable for use in thermoplastics and thermosets, meaning it can be used in materials like nylon, acetal, and polypropylene. The insert nut offers strong, secure thread engagement and is designed to provide maximum pull-out resistance.