Manufactured by CHG Bearing, the NN 3028/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/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NN 3028/SPW33 |
| Brand | CHG® |
| Characteristics | |
| Bearing Type | Super-precision Cylindrical Roller Bearing |
| Design Type | Cylindrical Bore |
| 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 |
| 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) | 6.21 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 188 |
NN 3028/SPW33 210 mm 140 mm 53 mm Frequently Asked Questions about NN 3028/SPW33 Super-Precision 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 NN 3028/SPW33 with a precision bore diameter (d) of 140 mm, an outside diameter (D) of 210 mm, and a nominal ring width (B) of 53 mm. This configuration yields an effective cross-sectional wall thickness of 35.0 mm and an envelope ratio (D/d) of 1.5, delivering compact rigidity for OEM machinery housings.
Standard batches of CHG Bearing NN 3028/SPW33 conform strictly to ISO Class Normal (ABEC-1). For high-precision machine tool spindles, gearboxes, or robotics requiring tighter runouts, CHG Bearing can provide custom batches graded to ISO Class 6 (P6/ABEC-3) or ISO Class 5 (P5/ABEC-5) with 100% micrometer verification.
For international ocean and air freight, CHG Bearing packs NN 3028/SPW33 with industrial VCI anti-corrosion barrier wrapping, sealed polybags, individual cartons, and fumigated ocean-worthy wooden crates. This multi-layer barrier guarantees rust-free storage for a minimum shelf life of 24 to 36 months.
As standard production, CHG Bearing subjects NN 3028/SPW33 to precision bainite or martensite quenching, offering dimensional stability up to 120°C (248°F). For high-heat processing equipment, CHG Bearing also supplies custom S0 (150°C), S1 (200°C), or S2 (250°C) stabilization heat treatments upon request to prevent residual austenite transformation.
