We supply heavy-duty track rollers and matched forged sealed lubrication track chains specially for Hitachi EX40-1 mini excavators, manufactured by Tianjin Longdong. Made of integrated forged 50Mn alloy steel with complete heat treatment, equipped with dual floating anti-leak seals to resist mud and water erosion, ideal for small narrow-site construction and landscaping projects. All dimensions fully comply with OEM standards for direct fitting without adjustment. We support comprehensive customization on thickened mining structure, paint color, brand marking and export packaging, along with a 12-month quality warranty and favorable factory direct price.