Free Imprint – Free Freight | National Magnet National Magnet & Supply Company 15 West Mall Plainview, New York 11803-4209 USA. Phone: 1-800-MAGNETT Phone: 1-800-624-6388 Phone: 1-516-752-7990 Fax: 1-516-752-7995 National Magnet & Supply Company 15 West Mall Plainview, New York 11803-4209 USA. Phone: 1-800-MAGNETT Phone: 1-800-624-6388 Phone: 1-516-752-7990 Fax: 1-516-752-7995