Manufactured by CHG Bearing, the NN 3028 K/SPC3W33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 140 mm bore diameter, a 210 mm outer diameter, and a 53 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 3028 K/SPC3W33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NN 3028 K/SPC3W33 |
| 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) | 140 mm |
| Width (B) | 53 mm |
| Outer Diameter (D) | 210 mm |
| Minimum Chamfer Dimension rmin | 2 mm |
| Inner Ring Chamfer | 2 mm |
| Outer Ring Chamfer | 1.1 mm |
| End-face Height Difference h | 2.5 mm |
| Inner-Ring Land Diameter (L1 / d1) | 166.5 mm |
| Outer Ring Raceway Diameter E | 192 mm |
| Shaft Shoulder Diameter dₐ, min. | 150 mm |
| Housing Shoulder Diameter Dₐ, min. | 194 mm |
| Housing Shoulder Diameter Dₐ, max. | 200 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 297 kN |
| Basic Static Load Rating C₀ (kN) | 520 kN |
| Limiting Speed – Grease (r/min) | 4000 r/min |
| Limiting Speed – Oil-air (r/min) | 4500 r/min |
| Reference Grease Quantity Gref (cm³) | 52 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 56 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 3070 N/µm |
| Material | |
| Lubrication Groove Width | 8.75 mm |
| Lubrication Holes (qty × Ø mm) | 4.5 |
| Weight (kg) | 6.15 kg |
| Radial Internal Clearance | C3 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 188 |
NN 3028 K/SPC3W33 210 mm 140 mm 53 mm Frequently Asked Questions about NN 3028 K/SPC3W33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Quality starts with raw material selection: CHG Bearing crafts NN 3028 K/SPC3W33 inner and outer rings from high-purity High-Quality Chrome Steel (GCr15/100Cr6). Our raw billets undergo vacuum degassing and secondary ESR (electroslag remelting) processes to drastically eliminate non-metallic sulfide and oxide inclusions, elevating subsurface contact fatigue resistance.
Model NN 3028 K/SPC3W33 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 140 mm) and steep thermal gradients between inner and outer rings.
Each NN 3028 K/SPC3W33 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 (140 mm bore side) ensures perfect planar contact without edge binding.
Built for demanding industrial environments, the NN 3028 K/SPC3W33 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.
