Engineering Class Drive Chain Keep Your Operation Moving with U.S. Tsubaki ChainU.S. Tsubaki Drive Chains are designed to exceed the listed ultimate strength ratings. These ratings are very significant. Chains with greater ultimate strength have higher actual yield and greater fatigue strength. With U.S. Tsubaki chains, you get extra reserve strength to withstand high shock loads. Precision Manufacturing Means Greater Fatigue StrengthU.S. Tsubaki Engineering Class Drive Chains are built to withstand the most rugged conditions. We use the latest manufacturing and heat-treating techniques to