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1. the choice of installation site and requirements
Installation site should work with lathes, grinders and other machinery and equipment from a distance. Space should be clean and keep dry and clean to prevent scrap iron, sand, dust, water entering the KOYO bearings.
2. the inspections bearing types, ready to install tools
Verify if the bearing type, size meets the installation requirements, and based on the structural characteristics of KOYO bearings and is accompanied in all parts, select proper Assembly methods, tools and measuring tools for when you are ready to install. Common installation tool every passenger steamship, copper rods, socket, special pads, spiral shell's anti-mosquito fixture, presses, capacity with a Vernier caliper, micrometer, micrometer level.
3. test surface of the bearing Assembly
KOYO bearing mounting surface and tie to the part surface, such as scratches, rust, debris, sand, dust and soil, a bearing installation difficulties, resulting in incorrect Assembly position; the second is the formation of abrasive material, easy to clean the damaged bearing working surface, affecting the quality of Assembly. Therefore, install the front axle, bearing block hole of the shell surface, face, shoulder and connecting components such as bushings, washers, caps of mating surfaces, a careful inspection. If there is corrosion, fine nail file nail file off, sand cloth, but also to clear the KOYO bearings Assembly and connecting parts on the surface of attachments
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| NNU4956 NTN | 280 | 380 | 100 |
| NNU4952K NTN | 260 | 360 | 100 |