Manufactured by CHG Bearing, the NN 3008 KTN/SP is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 40 mm bore diameter, a 68 mm outer diameter, and a 21 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 3008 KTN/SP - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NN 3008 KTN/SP |
| 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 | None |
| Number of Flanges – Outer Ring | 0 |
| Number of Ribs – Inner Ring | 3 |
| Dimensions | |
| Bore Diameter (d) | 40 mm |
| Width (B) | 21 mm |
| Outer Diameter (D) | 68 mm |
| Minimum Chamfer Dimension rmin | 1 mm |
| Inner Ring Chamfer | 1 mm |
| Outer Ring Chamfer | 0.6 mm |
| End-face Height Difference h | 1.5 mm |
| Inner-Ring Land Diameter (L1 / d1) | 50.6 mm |
| Outer Ring Raceway Diameter E | 61 mm |
| Shaft Shoulder Diameter dₐ, min. | 45 mm |
| Housing Shoulder Diameter Dₐ, min. | 62 mm |
| Housing Shoulder Diameter Dₐ, max. | 63 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 42.9 kN |
| Basic Static Load Rating C₀ (kN) | 56 kN |
| Limiting Speed – Grease (r/min) | 13000 r/min |
| Limiting Speed – Oil-air (r/min) | 15000 r/min |
| Reference Grease Quantity Gref (cm³) | 1.8 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 6.4 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 890 N/µm |
| Material | |
| Weight (kg) | 0.278 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Non-metallic Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 59.9 |
NN 3008 KTN/SP 68 mm 40 mm 21 mm Frequently Asked Questions about NN 3008 KTN/SP Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Each NN 3008 KTN/SP produced in CHG Bearing manufacturing facilities features accurately profiled corner chamfers complying with DIN 5412 / ISO standard corner radii. When designing mating shafts and housing shoulders, machining an undercut or fillet radius strictly within the inner ring clearance limit (40 mm bore side) ensures perfect planar contact without edge binding.
In its sealed configuration (Open Type), CHG Bearing pre-charges NN 3008 KTN/SP 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.
The CHG Bearing NN 3008 KTN/SP is rated for limiting speeds up to standard rated RPM under forced oil-mist or circulating oil lubrication regimes. When lubricated with factory-filled synthetic high-speed grease, safe continuous velocity is maintained at approximately 75% to 85% of the maximum nominal limit, preventing thermal runaway.
As a primary manufacturer, CHG Bearing supports both trial batch evaluations and container-load supply for NN 3008 KTN/SP. Standard catalog sizes are stocked for rapid 3–7 day dispatch, while high-volume OEM production runs typically dispatch within 30–45 days.
