Manufactured by CHG Bearing, the NN 3072 K/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 360 mm bore diameter, a 540 mm outer diameter, and a 134 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 3072 K/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NN 3072 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) | 360 mm |
| Width (B) | 134 mm |
| Outer Diameter (D) | 540 mm |
| Minimum Chamfer Dimension rmin | 4 mm |
| Inner Ring Chamfer | 5 mm |
| Outer Ring Chamfer | 2.5 mm |
| End-face Height Difference h | 10.9 mm |
| Inner-Ring Land Diameter (L1 / d1) | 428 mm |
| Outer Ring Raceway Diameter E | 493 mm |
| Shaft Shoulder Diameter dₐ, min. | 378 mm |
| Housing Shoulder Diameter Dₐ, min. | 497 mm |
| Housing Shoulder Diameter Dₐ, max. | 520 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 1720 kN |
| Basic Static Load Rating C₀ (kN) | 3450 kN |
| Limiting Speed – Grease (r/min) | 1300 r/min |
| Limiting Speed – Oil-air (r/min) | 1500 r/min |
| Fatigue Load Limit Pᵤ (kN) | 310 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 7360 N/µm |
| Material | |
| Lubrication Groove Width | 16.7 mm |
| Lubrication Holes (qty × Ø mm) | 9 |
| Weight (kg) | 107 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
NN 3072 K/SPW33 540 mm 360 mm 134 mm Frequently Asked Questions about NN 3072 K/SPW33 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 3072 K/SPW33 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.
The Open Type engineered for NN 3072 K/SPW33 by CHG Bearing utilizes precision non-contact metal shields or reinforced NBR/FKM contact lip seals. This barrier prevents particulate ingress, washdown fluids, and abrasive dust from reaching the raceways while eliminating grease leakage under centrifugal forces.
Engineered according to international ISO boundary plans, CHG Bearing supplies NN 3072 K/SPW33 with a precision bore diameter (d) of 360 mm, an outside diameter (D) of 540 mm, and a nominal ring width (B) of 134 mm. This configuration yields an effective cross-sectional wall thickness of 90.0 mm and an envelope ratio (D/d) of 1.5, delivering compact rigidity for OEM machinery housings.
Following standard ISO 281 fatigue calculation guidelines, the nominal rating life (L10) of CHG Bearing NN 3072 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.
