Forging Machinery Manufacturing Co. Manufactures Self Contained Friction Belt Drop Hammers. Forging Machinery Manufacturing Co. Is an ISO 9001: 2008 certified company. The Self Contained Friction Belt Drop Hammers are available in 6 different capacities, namely 500 Kgs, 1,000 Kgs., 1,500 Kgs, 2,000 Kgs, 3,000 Kgs and 4000 Kgs.