Manufactured by CHG Bearing, the NN 3044 K/SPC3W33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 220 mm bore diameter, a 340 mm outer diameter, and a 90 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 3044 K/SPC3W33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NN 3044 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) | 220 mm |
| Width (B) | 90 mm |
| Outer Diameter (D) | 340 mm |
| Minimum Chamfer Dimension rmin | 2.5 mm |
| Inner Ring Chamfer | 3 mm |
| Outer Ring Chamfer | 1.1 mm |
| End-face Height Difference h | 2 mm |
| Inner-Ring Land Diameter (L1 / d1) | 265.2 mm |
| Outer Ring Raceway Diameter E | 310 mm |
| Shaft Shoulder Diameter dₐ, min. | 233 mm |
| Housing Shoulder Diameter Dₐ, min. | 313 mm |
| Housing Shoulder Diameter Dₐ, max. | 327 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 809 kN |
| Basic Static Load Rating C₀ (kN) | 1460 kN |
| Limiting Speed – Grease (r/min) | 2400 r/min |
| Limiting Speed – Oil-air (r/min) | 2800 r/min |
| Reference Grease Quantity Gref (cm³) | 260 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 143 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 4700 N/µm |
| Material | |
| Lubrication Groove Width | 15 mm |
| Lubrication Holes (qty × Ø mm) | 7.5 |
| Weight (kg) | 27.9 kg |
| Radial Internal Clearance | C3 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 302.5 |
NN 3044 K/SPC3W33 340 mm 220 mm 90 mm Frequently Asked Questions about NN 3044 K/SPC3W33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
In its sealed configuration (Open Type), CHG Bearing pre-charges NN 3044 K/SPC3W33 with premium wide-temperature lithium-complex or polyurea grease, calibrated to a 30%–35% cavity volume ratio. For open-type variants, synthetic PAO or refined mineral lubricating oils with appropriate EP (Extreme Pressure) additives should be circulated.
To safeguard CHG Bearing NN 3044 K/SPC3W33 against fretting wear and false brinelling during transport or vibration, assemble mating surfaces (220 mm x 340 mm) using anti-fretting mounting paste. Maintaining strict alignment and avoiding prolonged static vibration will preserve raceway polish.
Absolutely. The CHG Bearing NN 3044 K/SPC3W33 Super-Precision Cylindrical Roller Bearings is a 1:1 direct interchange for renowned brands, matching part numbers: SKF NN 3044 K/SPC3W33, FAG NN 3044 K/SPC3W33, NSK NN 3044 K/SPC3W33. It shares identical envelope boundary dimensions, load capacities, and shaft fits, allowing instant drop-in replacement without retrofitting your machinery.
As standard production, CHG Bearing subjects NN 3044 K/SPC3W33 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.
