D8T bulldozer segments ring sprocket 3145462 CR7160 The Sprocket belongs to castings, which are first poured, castings tempered, blanks sanded, rail surface quenched, tempered, and machining. technology, like casting, welding and forging, use precision processing technology and special heat treatment technique to reach best wear-resistance and have maximum extent loading capacity as well as anti-cracking. Our products are according to the standard of OEM to manufacture.