U.S. PATENTS 7,237,375 B2 and 7,343,730 B2 | Canadian Patent 2,519,633


  1. Curved “chain saver” sidebars:

    Reduces wear, and provides additional load carrying capacity and wear reduction when operated on chainsaver rim sprockets.

  2. Maximum Corrosion Resistance:

    DuraMax cast stainless steel alloys provide superior corrosion resistance to most major biological and chemical elements and compounds found in water and wastewater, including hydrogen sulfide, ammonia, chlorine, ferric and ferrous chlorides, alum, sodium and calcium chlorides, anoxic (septic) wastes, high temperature, high and low pH levels, and brackish waters.

  3. Cast Precipitation Hardening Stainless Steel Chain Links and Chain Pins:

    DuraMax CS720SS Chains are the strongest and most durable 720/730 Series chains in the industry.

    DuraMax CS720SS Chain links and pins are cast from precipitation hardening aerospace-grade stainless steels, and are heat-treated and through hardened to an average of 385-415 Brinell for maximum wear resistance.

    DuraMax CS720SS Chain (6.00” pitch) has an ultimate strength of 78,000 pounds, an ASME rated working load of 7,800 pounds, and a weight of only 5.8#/foot.

  4. Smooth, Non-abrasive Surface:

    Smooth, non-porous and tight-grain investment cast surface structure designed for use on DuraMax Polymeric and Stainless Steel Segmental Rim Sprockets.

  5. Uniform Dimensional Tolerances:

    The patented DuraMax investment casting process yields very uniform dimensional tolerances throughout each and every link cast. This eliminates the need for match-marking and shipping the chain in matched strands, and assures perfect side-to-side equipment alignment, even in very large equipment applications.

    Tight tolerances between the barrel and chain pin, and between the pin boss and chain pin reduce the entry of grit, sand, and abrasives within the chain joints.

  6. Full length sidebar reinforcing ribs:

    The T-shaped sidebar provides uniform cross sectional mass across the “x” and “y” axis, resulting in extraordinary chain strength.

  7. Easy-to-install chain pin:

    The “no press fit” chain pin design can be installed by hand, and without the application of mechanical force.