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


  1. Easy-to-install chain pin:

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

  2. Mill-type sidebars:

    Reduces sliding wear, and provides additional load carrying capacity and longevity.

  3. 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.

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

    DuraMax Drive Chains are the strongest and most durable drive chains in their class.

    DuraMax H78SS and H82SS 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 H82SS Chain (3.075” pitch) has an ultimate strength of 58,000 pounds, an ASME rated working load of 6,800 pounds, and a weight of 6.0#/foot.

    DuraMax H78SS Chain (2.609” pitch) has an ultimate strength of 34,000 pounds, an ASME rated working load of 4,300 pounds, and a weight of 4.9#/foot.

  5. 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.

  6. 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.

  7. Full length sidebar reinforcing ribs:

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