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HNA premium liners combine the strength of a forged steel outer shell with the abrasion and corrosion resistance of a high chromium iron inner sleeve. These liners feature a centrifugally cast high chrome iron sleeve which is machined and heat treated to a minimum uniform bore hardness of 62 RC. Each liner is machined to close tolerances to assure ease of installation and long liner life with the inside diameter of these premium liners honed to a mirror-like finish for smooth even wear during the life of the liner. HNA premium liners are made for superior performance under tough corrosive and abrasive conditions.

HNA offers chrome-plated liners made from premium forged steel with the core plated by chrome.The chrome-plated liners have hardening characteristics of 58 to 62 Rockwell C hardness.

 

HNA hardened liners offer economy in a liner that is made for normal to mildly corrosive mud conditions.These liners are hardened and heat treated under strict quality control to a minimum of 60 RC hardness and a depth of 0.125 inches.Each liner is honed to a mirror-like finish for smooth and even wear during the life of the liner and is machined to close tolerances to assure easy installation and long life.