Hesen Machinery's high-strength roller bolts are exceptional with their impressive hardness rating - HRC 36-42. These roller bolts are extensively used in various heavy-duty machinery such as the track roller (lower roller), idler, carrier roller (upper roller) used for some of the leading excavators and bulldozers like CAT, Komatsu, Hitachi, Kobelco, Hyundai, and many others. By utilizing Hongyi's superior roller bolts, you can ensure that your machinery is well-protected against wear and impact damage, thus extending its lifespan. This also means that you can save time and minimize machine downtime, allowing your business to operate smoothly and efficiently.