Manufactured by CHG Bearing, the M257248DW/M257210/M257210D is a precision Four-Row Tapered Roller Bearings. Key dimensional parameters include a 304.902 mm bore diameter, a 412.648 mm outer diameter, and a 266.7 mm overall width. This component is designed to meet standard load requirements and ensure consistent operational performance. For comprehensive technical evaluation, please explore the detailed specifications, dimensional data, product images, and CAD drawings provided below. A complete PDF data sheet is also readily available for direct download to support your engineering and procurement needs.
M257248DW/M257210/M257210D - Four-Row Tapered Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | M257248DW/M257210/M257210D |
| Brand | CHG® |
| Characteristics | |
| Bearing Type | Four Row Tapered Roller Bearing |
| Number of Rows | Four Row |
| Tolerance Class | Class 4 |
| Dimensions | |
| Bore Diameter (d) | 304.902 mm |
| Width (B) | 266.7 mm |
| Outer Diameter (D) | 412.648 mm |
| Bore Diameter Tolerance | 0 – +0.051 mm |
| Outside Diameter Tolerance | 0 – +0.051 mm |
| Inner Ring Chamfer | 3.3 min mm |
| Outer Ring Chamfer | 3.3 min mm |
| Inner Ring Assembly Width Tolerance | -1.524 – +1.524 mm |
| Outer Ring Assembly Width | 266.7 mm |
| Outer Ring Assembly Width Tolerance | -1.524 – +1.524 mm |
| Shaft Abutment Diameter | 327.1 mm |
| Housing Abutment Diameter | 385.5 mm |
| Lubrication Hole Diameter | 6 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 2290 kN |
| Basic Static Load Rating C0 (kN) | 6760 kN |
| Material | |
| Mass (kg) | 101 kg |
| Ring Material | Case-Hardened Steel / Bearing Steel |
| Rolling Element Material | Case-Hardened Steel / Bearing Steel |
| Cage Material | Grade 10 Steel |
| Lubrication Groove Width | 12.2 mm |
M257248DW/M257210/M257210D 412.648 mm 304.902 mm 266.7 mm Frequently Asked Questions about M257248DW/M257210/M257210D Four-Row Tapered Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Engineered according to international ISO boundary plans, CHG Bearing supplies M257248DW/M257210/M257210D with a precision bore diameter (d) of 304.902 mm, an outside diameter (D) of 412.648 mm, and a nominal ring width (B) of 266.7 mm. This configuration yields an effective cross-sectional wall thickness of 53.9 mm and an envelope ratio (D/d) of 1.35, delivering compact rigidity for OEM machinery housings.
In its sealed configuration (Open Type), CHG Bearing pre-charges M257248DW/M257210/M257210D with premium wide-temperature lithium-complex or polyurea grease, calibrated to a 30%–35% cavity volume ratio. For open-type variants, synthetic PAO or refined mineral lubricating oils with appropriate EP (Extreme Pressure) additives should be circulated.
To extend the trouble-free lifespan of CHG Bearing M257248DW/M257210/M257210D, preventive maintenance routines should monitor operating housing temperature (normally maintaining below 70°C) and conduct regular vibration FFT analysis to identify early raceway micro-pitting before unexpected line halts occur.
To ensure optimum performance of CHG Bearing M257248DW/M257210/M257210D Four-Row Tapered Roller Bearings under general rotational loads, our application engineers advise an inner-ring shaft tolerance of m5 or k5 for the 304.902 mm bore. For the 412.648 mm outer ring, an H7 or J7 housing bore fit is recommended to eliminate creep while accommodating normal thermal gradient expansion.
