Manufactured by CHG Bearing, the NN 3068 K/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 340 mm bore diameter, a 520 mm outer diameter, and a 133 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 3068 K/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NN 3068 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) | 340 mm |
| Width (B) | 133 mm |
| Outer Diameter (D) | 520 mm |
| Minimum Chamfer Dimension rmin | 4 mm |
| Inner Ring Chamfer | 5 mm |
| Outer Ring Chamfer | 8.2 mm |
| End-face Height Difference h | 10.9 mm |
| Inner-Ring Land Diameter (L1 / d1) | 408 mm |
| Outer Ring Raceway Diameter E | 473 mm |
| Inner Ring Raceway Diameter F | 393 mm |
| Shaft Shoulder Diameter dₐ, min. | 358 mm |
| Housing Shoulder Diameter Dₐ, min. | 477 mm |
| Housing Shoulder Diameter Dₐ, max. | 502 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 1650 kN |
| Basic Static Load Rating C₀ (kN) | 3250 kN |
| Limiting Speed – Grease (r/min) | 1400 r/min |
| Limiting Speed – Oil-air (r/min) | 1500 r/min |
| Fatigue Load Limit Pᵤ (kN) | 290 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 7220 N/µm |
| Material | |
| Lubrication Groove Width | 16.7 mm |
| Lubrication Holes (qty × Ø mm) | 9 |
| Weight (kg) | 99 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
NN 3068 K/SPW33 520 mm 340 mm 133 mm Frequently Asked Questions about NN 3068 K/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
As standard production, CHG Bearing subjects NN 3068 K/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.
Engineered according to international ISO boundary plans, CHG Bearing supplies NN 3068 K/SPW33 with a precision bore diameter (d) of 340 mm, an outside diameter (D) of 520 mm, and a nominal ring width (B) of 133 mm. This configuration yields an effective cross-sectional wall thickness of 90.0 mm and an envelope ratio (D/d) of 1.53, delivering compact rigidity for OEM machinery housings.
To safeguard CHG Bearing NN 3068 K/SPW33 against fretting wear and false brinelling during transport or vibration, assemble mating surfaces (340 mm x 520 mm) using anti-fretting mounting paste. Maintaining strict alignment and avoiding prolonged static vibration will preserve raceway polish.
Absolutely. The CHG Bearing NN 3068 K/SPW33 Super-Precision Cylindrical Roller Bearings is a 1:1 direct interchange for renowned brands, matching part numbers: SKF NN 3068 K/SPW33, FAG NN 3068 K/SPW33, NSK NN 3068 K/SPW33. It shares identical envelope boundary dimensions, load capacities, and shaft fits, allowing instant drop-in replacement without retrofitting your machinery.
