Forging Machinery Manufacturing Co. Manufactures Grey Cast Iron made Anvil Block. Forging Machinery Manufacturing Co. Is an ISO 9001: 2008 certified company. The Grey Cast Iron made Anvil Block weights approx. 20 times of nominal capacity of the ram. It is machined on both top and bottom faces to hold die holder firmly and maintain position of the columns. The die holder fixed in the anvil block is forging from high grade alloy steel all over hardened and it is positioned properly with help of alloy steel tapered wedge.