Manufactured by CHG Bearing, the NNU 4936 B/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 180 mm bore diameter, a 250 mm outer diameter, and a 69 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 4936 B/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NNU 4936 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) | 180 mm |
| Width (B) | 69 mm |
| Outer Diameter (D) | 250 mm |
| Minimum Chamfer Dimension rmin | 2 mm |
| Inner Ring Chamfer | 2 mm |
| Outer Ring Chamfer | 2 mm |
| End-face Height Difference h | 1.1 mm |
| Outer-Ring Land Diameter (L2 / D1) | 226.05 mm |
| Inner Ring Raceway Diameter F | 202 mm |
| Shaft Shoulder Diameter dₐ, min. | 190 mm |
| Shaft Shoulder Diameter dₐ, max. – NNU Design | 199 mm |
| Shaft Shoulder Diameter dᵦ, min. – NNU Design | 205 mm |
| Housing Shoulder Diameter Dₐ, max. | 240 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 402 kN |
| Basic Static Load Rating C₀ (kN) | 850 kN |
| Limiting Speed – Grease (r/min) | 3000 r/min |
| Limiting Speed – Oil-air (r/min) | 3400 r/min |
| Reference Grease Quantity Gref (cm³) | 81 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 88 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 5190 N/µm |
| Material | |
| Lubrication Groove Width | 8.3 mm |
| Lubrication Holes (qty × Ø mm) | 3 |
| Weight (kg) | 10.4 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 203.5 |
NNU 4936 B/SPW33 250 mm 180 mm 69 mm Frequently Asked Questions about NNU 4936 B/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Yes, 100% of NNU 4936 B/SPW33 Super-Precision Cylindrical Roller Bearings leaving CHG Bearing production lines are subjected to multi-frequency Anderometer sound testing. All units satisfy baseline Z1V1 levels, with dedicated quiet-running electric motor quality (EMQ) lots certified to Z2V2 and Z3V3 standards for silent machinery integration.
Built for demanding industrial environments, the NNU 4936 B/SPW33 Super-Precision Cylindrical Roller Bearings by CHG Bearing boasts a dynamic load rating (Cr) of standard dynamic and a static load threshold (C0r) of standard static. The optimized internal raceway geometry balances stress distribution, mitigating edge loading even when operating under peak mechanical stresses.
To match diverse operational dynamics, CHG Bearing supplies NNU 4936 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.
Quality starts with raw material selection: CHG Bearing crafts NNU 4936 B/SPW33 inner and outer rings from high-purity High-Quality Chrome Steel (GCr15/100Cr6). Our raw billets undergo vacuum degassing and secondary ESR (electroslag remelting) processes to drastically eliminate non-metallic sulfide and oxide inclusions, elevating subsurface contact fatigue resistance.
