Manufactured by CHG Bearing, the NNU 4934 B/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 170 mm bore diameter, a 230 mm outer diameter, and a 60 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.
NNU 4934 B/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NNU 4934 B/SPW33 |
| Brand | CHG® |
| Characteristics | |
| Bearing Type | Super-precision Cylindrical Roller Bearing |
| Design Type | Cylindrical Bore |
| Structure (Drawing Reference) | Complete Bearing |
| Number of Rows | 2 |
| Ring Type | None |
| Design | NNU 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 | 3 |
| Number of Ribs – Inner Ring | 0 |
| Dimensions | |
| Bore Diameter (d) | 170 mm |
| Width (B) | 60 mm |
| Outer Diameter (D) | 230 mm |
| Minimum Chamfer Dimension rmin | 2 mm |
| Inner Ring Chamfer | 2 mm |
| Outer Ring Chamfer | 2 mm |
| End-face Height Difference h | 2 mm |
| Outer-Ring Land Diameter (L2 / D1) | 210.9 mm |
| Inner Ring Raceway Diameter F | 188.5 mm |
| Shaft Shoulder Diameter dₐ, min. | 180 mm |
| Shaft Shoulder Diameter dₐ, max. – NNU Design | 186 mm |
| Shaft Shoulder Diameter dᵦ, min. – NNU Design | 192 mm |
| Housing Shoulder Diameter Dₐ, max. | 220 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 336 kN |
| Basic Static Load Rating C₀ (kN) | 695 kN |
| Limiting Speed – Grease (r/min) | 3400 r/min |
| Limiting Speed – Oil-air (r/min) | 3800 r/min |
| Reference Grease Quantity Gref (cm³) | 72 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 73.5 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 4460 N/µm |
| Material | |
| Lubrication Groove Width | 5.5 mm |
| Lubrication Holes (qty × Ø mm) | 3 |
| Weight (kg) | 7.07 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 189.8 |
NNU 4934 B/SPW33 230 mm 170 mm 60 mm Frequently Asked Questions about NNU 4934 B/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Absolutely. The CHG Bearing NNU 4934 B/SPW33 Super-Precision Cylindrical Roller Bearings is a 1:1 direct interchange for renowned brands, matching part numbers: SKF NNU 4934 B/SPW33, FAG NNU 4934 B/SPW33, NSK NNU 4934 B/SPW33. It shares identical envelope boundary dimensions, load capacities, and shaft fits, allowing instant drop-in replacement without retrofitting your machinery.
When fitting NNU 4934 B/SPW33 over a 170 mm shaft, CHG Bearing strictly recommends uniform induction heating (controlled between 90°C and 110°C) or precision hydraulic press sleeves. Under no circumstances should direct impact blows be struck against the rings or cage, as shock loads cause brinelling indents and premature spalling.
To match diverse operational dynamics, CHG Bearing supplies NNU 4934 B/SPW33 with multiple cage configurations: high-strength pressed steel ribbon cages for standard duty, solid machined brass cages (M/CA) for heavy vibration and shock loads, or lightweight glass-fiber reinforced polyamide cages (TN9/TVP) for high acceleration and ultra-low noise.
Standard batches of CHG Bearing NNU 4934 B/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.
