Manufactured by CHG Bearing, the NN 3028 K/SPW33 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/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NN 3028 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) | 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 | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 188 |
NN 3028 K/SPW33 210 mm 140 mm 53 mm Frequently Asked Questions about NN 3028 K/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Each NN 3028 K/SPW33 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.
When fitting NN 3028 K/SPW33 over a 140 mm shaft, CHG Bearing strictly recommends uniform induction heating (controlled between 90°C and 110°C) or precision hydraulic press sleeves. Under no circumstances should direct impact blows be struck against the rings or cage, as shock loads cause brinelling indents and premature spalling.
The CHG Bearing NN 3028 K/SPW33 is rated for limiting speeds up to standard rated RPM under forced oil-mist or circulating oil lubrication regimes. When lubricated with factory-filled synthetic high-speed grease, safe continuous velocity is maintained at approximately 75% to 85% of the maximum nominal limit, preventing thermal runaway.
Absolutely. The CHG Bearing NN 3028 K/SPW33 Super-Precision Cylindrical Roller Bearings is a 1:1 direct interchange for renowned brands, matching part numbers: SKF NN 3028 K/SPW33, FAG NN 3028 K/SPW33, NSK NN 3028 K/SPW33. It shares identical envelope boundary dimensions, load capacities, and shaft fits, allowing instant drop-in replacement without retrofitting your machinery.
