Manufactured by CHG Bearing, the NN 3056 K/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 280 mm bore diameter, a 420 mm outer diameter, and a 106 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 3056 K/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NN 3056 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) | 280 mm |
| Width (B) | 106 mm |
| Outer Diameter (D) | 420 mm |
| Minimum Chamfer Dimension rmin | 3 mm |
| Inner Ring Chamfer | 4 mm |
| Outer Ring Chamfer | 1.5 mm |
| End-face Height Difference h | 5 mm |
| Inner-Ring Land Diameter (L1 / d1) | 332.8 mm |
| Outer Ring Raceway Diameter E | 384 mm |
| Shaft Shoulder Diameter dₐ, min. | 296 mm |
| Housing Shoulder Diameter Dₐ, min. | 387 mm |
| Housing Shoulder Diameter Dₐ, max. | 404 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 1080 kN |
| Basic Static Load Rating C₀ (kN) | 2080 kN |
| Limiting Speed – Grease (r/min) | 1900 r/min |
| Limiting Speed – Oil-air (r/min) | 2200 r/min |
| Reference Grease Quantity Gref (cm³) | 420 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 196 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 6010 N/µm |
| Material | |
| Lubrication Groove Width | 15.3 mm |
| Lubrication Holes (qty × Ø mm) | 7.5 |
| Weight (kg) | 48.7 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 375.3 |
NN 3056 K/SPW33 420 mm 280 mm 106 mm Frequently Asked Questions about NN 3056 K/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Absolutely. The CHG Bearing NN 3056 K/SPW33 Super-Precision Cylindrical Roller Bearings is a 1:1 direct interchange for renowned brands, matching part numbers: SKF NN 3056 K/SPW33, FAG NN 3056 K/SPW33, NSK NN 3056 K/SPW33. It shares identical envelope boundary dimensions, load capacities, and shaft fits, allowing instant drop-in replacement without retrofitting your machinery.
Standard batches of CHG Bearing NN 3056 K/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.
Engineered according to international ISO boundary plans, CHG Bearing supplies NN 3056 K/SPW33 with a precision bore diameter (d) of 280 mm, an outside diameter (D) of 420 mm, and a nominal ring width (B) of 106 mm. This configuration yields an effective cross-sectional wall thickness of 70.0 mm and an envelope ratio (D/d) of 1.5, delivering compact rigidity for OEM machinery housings.
To ensure optimum performance of CHG Bearing NN 3056 K/SPW33 Super-Precision Cylindrical Roller Bearings under general rotational loads, our application engineers advise an inner-ring shaft tolerance of m5 or k5 for the 280 mm bore. For the 420 mm outer ring, an H7 or J7 housing bore fit is recommended to eliminate creep while accommodating normal thermal gradient expansion.
