Manufactured by CHG Bearing, the NN 3038 K/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 190 mm bore diameter, a 290 mm outer diameter, and a 75 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.
NN 3038 K/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NN 3038 K/SPW33 |
| Brand | CHG® |
| Characteristics | |
| Bearing Type | Super-precision Cylindrical Roller Bearing |
| Design Type | Tapered Bore 1:12 |
| Structure (Drawing Reference) | Complete Bearing |
| Number of Rows | 2 |
| Ring Type | None |
| Design | NN Design |
| Tolerance Class | SP |
| Bearing Material | Bearing Steel |
| Coating | None |
| Sealing | None |
| Lubricant | None |
| Features | Annular Lubrication Groove and Lubrication Holes |
| Number of Flanges – Outer Ring | 0 |
| Number of Ribs – Inner Ring | 3 |
| Dimensions | |
| Bore Diameter (d) | 190 mm |
| Width (B) | 75 mm |
| Outer Diameter (D) | 290 mm |
| Minimum Chamfer Dimension rmin | 2 mm |
| Inner Ring Chamfer | 2.1 mm |
| Outer Ring Chamfer | 1.1 mm |
| End-face Height Difference h | 3 mm |
| Inner-Ring Land Diameter (L1 / d1) | 228.2 mm |
| Outer Ring Raceway Diameter E | 265 mm |
| Shaft Shoulder Diameter dₐ, min. | 201 mm |
| Housing Shoulder Diameter Dₐ, min. | 267 mm |
| Housing Shoulder Diameter Dₐ, max. | 279 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 594 kN |
| Basic Static Load Rating C₀ (kN) | 1080 kN |
| Limiting Speed – Grease (r/min) | 2800 r/min |
| Limiting Speed – Oil-air (r/min) | 3200 r/min |
| Reference Grease Quantity Gref (cm³) | 144 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 108 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 4280 N/µm |
| Material | |
| Lubrication Groove Width | 11.35 mm |
| Lubrication Holes (qty × Ø mm) | 6 |
| Weight (kg) | 17.1 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 258.9 |
NN 3038 K/SPW33 290 mm 190 mm 75 mm Frequently Asked Questions about NN 3038 K/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Following standard ISO 281 fatigue calculation guidelines, the nominal rating life (L10) of CHG Bearing NN 3038 K/SPW33 correlates its dynamic capacity (standard dynamic) with equivalent dynamic loads. In controlled industrial settings with proper contamination-free filtration, field data confirms continuous operational longevity exceeding 20,000 to 50,000 service hours.
In its sealed configuration (Open Type), CHG Bearing pre-charges NN 3038 K/SPW33 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 NN 3038 K/SPW33, 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.
Built for demanding industrial environments, the NN 3038 K/SPW33 Super-Precision Cylindrical Roller Bearings by CHG Bearing boasts a dynamic load rating (Cr) of standard dynamic and a static load threshold (C0r) of standard static. The optimized internal raceway geometry balances stress distribution, mitigating edge loading even when operating under peak mechanical stresses.
