Manufactured by CHG Bearing, the NN 3012 KTN/SP is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 60 mm bore diameter, a 95 mm outer diameter, and a 26 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 3012 KTN/SP - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NN 3012 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) | 60 mm |
| Width (B) | 26 mm |
| Outer Diameter (D) | 95 mm |
| Minimum Chamfer Dimension rmin | 1 mm |
| Inner Ring Chamfer | 1.1 mm |
| Outer Ring Chamfer | 0.6 mm |
| End-face Height Difference h | 1.5 mm |
| Inner-Ring Land Diameter (L1 / d1) | 73.3 mm |
| Outer Ring Raceway Diameter E | 86.1 mm |
| Shaft Shoulder Diameter dₐ, min. | 66.5 mm |
| Housing Shoulder Diameter Dₐ, min. | 87 mm |
| Housing Shoulder Diameter Dₐ, max. | 88.5 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 73.7 kN |
| Basic Static Load Rating C₀ (kN) | 106 kN |
| Limiting Speed – Grease (r/min) | 9500 r/min |
| Limiting Speed – Oil-air (r/min) | 11000 r/min |
| Reference Grease Quantity Gref (cm³) | 3.8 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 12.7 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 1330 N/µm |
| Material | |
| Weight (kg) | 0.6 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Non-metallic Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 84.9 |
NN 3012 KTN/SP 95 mm 60 mm 26 mm Frequently Asked Questions about NN 3012 KTN/SP 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 3012 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 3012 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.
Model NN 3012 KTN/SP is manufactured by CHG Bearing in standard Normal clearance (CN) for ambient temperature transmission, and C3 or C4 clearance for heavy duty applications. C3 clearance compensates for radial shrinkage caused by tight shaft press-fits (bore 60 mm) and steep thermal gradients between inner and outer rings.
Engineered according to international ISO boundary plans, CHG Bearing supplies NN 3012 KTN/SP with a precision bore diameter (d) of 60 mm, an outside diameter (D) of 95 mm, and a nominal ring width (B) of 26 mm. This configuration yields an effective cross-sectional wall thickness of 17.5 mm and an envelope ratio (D/d) of 1.58, delivering compact rigidity for OEM machinery housings.
