Anti-Friction Washer System

A mine roof bolt system comprising:

• a bolt having a proximal end having a bolt head and a distal end;
• a bearing plate located at the proximal end of the bolt;
• and
• an anti-friction washer system located between the bearing plate and the bolt head,
• wherein the anti-friction washer system comprises two steel washers coated with a zinc coating that is at least 0.0002 inch thick, the two washers adhered to one another by an adhesive having a melting temperature of 300° F. or less.

A method of manufacturing an anti-friction washer system comprising:

• providing two zinc-coated washers;
• depositing a melted thermoplastic adhesive in a plurality of locations circumferentially around one surface of one of the washers;
• placing the other washer on top of the melted thermoplastic adhesive;
• applying pressure to the washers to bond the washers together;
• and
• cooling the bonded washers.