Product Description
Bearing cup—SKU 8012872—is a precision-ground, SAE 52100 tapered roller bearing component designed for electric lift truck axle and wheel assemblies. Features include 3.5000 inch outer diameter, 0.8125 inch width, through-hardened steel, and compatibility with standard electric lift truck drive axle configurations.
Specifications
Material & Construction
| Material | SAE 52100 through-hardened steel |
| Hardness | Rockwell C58-C64 |
| Steel Grade | SAE 52100 |
Dimensions
| Outer Diameter | 3.5000 inch |
| Width | 0.8125 inch |
Part Numbers
| Manufacturer Part Number | 8012872 |
Application
| Compatibility | Standard electric lift truck drive axle configurations |
Frequently Asked Questions
Q: What are the physical dimensions and material specification of the 8012872 bearing cup?
A: The 8012872 is a tapered roller bearing cup with 3.5000 inch outer diameter and 0.8125 inch width. It is manufactured from SAE 52100 through-hardened steel with Rockwell hardness C58-C64. This hardness range ensures load capacity and wear resistance in electric lift truck drive axle configurations.
Q: Which electric lift truck axle models use the 8012872 bearing cup?
A: The 8012872 is compatible with standard electric lift truck drive axles from Crown, Toyota, Raymond, Yale, Hyster, Jungheinrich, Linde, Clark, Mitsubishi, CAT, and BT. It pairs with a matching tapered roller bearing cone to form the complete axle bearing assembly. Verify axle specifications match before ordering.
Q: Why is SAE 52100 steel used for the 8012872 bearing cup?
A: SAE 52100 is a premium chromium steel that provides superior hardness, fatigue resistance, and surface finish stability under heavy rolling loads. The through-hardened design (Rockwell C58-C64) ensures consistent hardness throughout the cup depth, preventing race wear and extending bearing life in continuous-duty lift truck service.
Q: What precautions are necessary when handling the 8012872 bearing cup?
A: The 8012872 is a precision-ground component. Avoid dropping or striking the bearing race, as even small cracks or dents cause rapid failure under load. Keep the bearing bore and outer diameter clean and free from rust or corrosion. Store in a dry environment to prevent oxidation.
Q: Can the 8012872 bearing cup be reused if the cone is replaced?
A: No. Tapered roller bearing cups and cones are precision-matched pairs. If one component fails, replace both as a set to ensure proper fit, preload, and load distribution. Reusing a worn cup with a new cone results in misalignment and premature failure of the new bearing.