Manufactured by CHG Bearing, the NU238R is a precision Single Row Cylindrical Roller Bearings. Key dimensional parameters include a 190 mm bore diameter, a 340 mm outer diameter, and a 55 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.
NU238R - Single Row Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NU238R |
| Brand | CHG® |
| Characteristics | |
| Bearing Type | Single Row Cylindrical Roller Bearing |
| Number of Rows | Single Row |
| Tolerance Class | P0 |
| Dimensions | |
| Bore Diameter (d) | 190 mm |
| Width (B) | 55 mm |
| Outer Diameter (D) | 340 mm |
| Bore Diameter Tolerance | -0.030 – 0 mm |
| Outside Diameter Tolerance | -0.040 – 0 mm |
| Width Tolerance | -0.30 – 0 mm |
| Enveloping Circle Diameter Fw | 230 mm |
| Inner Ring Chamfer | 4 min mm |
| Outer Ring Chamfer | 4 min mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 694 kN |
| Basic Static Load Rating C0 (kN) | 954 kN |
| Material | |
| Mass (kg) | 23.2 kg |
| Ring Material | Bearing Steel |
| Rolling Element Material | Bearing Steel |
| Cage Material | Brass |
NU238R 340 mm 190 mm 55 mm 230 mm Frequently Asked Questions about NU238R Single Row Cylindrical 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 NU238R with a precision bore diameter (d) of 190 mm, an outside diameter (D) of 340 mm, and a nominal ring width (B) of 55 mm. This configuration yields an effective cross-sectional wall thickness of 75.0 mm and an envelope ratio (D/d) of 1.79, delivering compact rigidity for OEM machinery housings.
Each NU238R produced in CHG Bearing manufacturing facilities features accurately profiled corner chamfers complying with DIN 5412 / ISO standard corner radii. When designing mating shafts and housing shoulders, machining an undercut or fillet radius strictly within the inner ring clearance limit (190 mm bore side) ensures perfect planar contact without edge binding.
Model NU238R is manufactured by CHG Bearing in standard Normal clearance (CN) for ambient temperature transmission, and C3 or C4 clearance for heavy duty applications. C3 clearance compensates for radial shrinkage caused by tight shaft press-fits (bore 190 mm) and steep thermal gradients between inner and outer rings.
In its sealed configuration (Open Type), CHG Bearing pre-charges NU238R 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.
