Manufactured by CHG Bearing, the NNU 4960 B/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 300 mm bore diameter, a 420 mm outer diameter, and a 118 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 4960 B/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NNU 4960 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) | 300 mm |
| Width (B) | 118 mm |
| Outer Diameter (D) | 420 mm |
| Minimum Chamfer Dimension rmin | 2.5 mm |
| Inner Ring Chamfer | 3 mm |
| Outer Ring Chamfer | 3 mm |
| End-face Height Difference h | 5.5 mm |
| Outer-Ring Land Diameter (L2 / D1) | 379 mm |
| Inner Ring Raceway Diameter F | 339 mm |
| Shaft Shoulder Diameter dₐ, min. | 313 mm |
| Shaft Shoulder Diameter dₐ, max. – NNU Design | 335 mm |
| Shaft Shoulder Diameter dᵦ, min. – NNU Design | 343 mm |
| Housing Shoulder Diameter Dₐ, max. | 407 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 1020 kN |
| Basic Static Load Rating C₀ (kN) | 2360 kN |
| Limiting Speed – Grease (r/min) | 1800 r/min |
| Limiting Speed – Oil-air (r/min) | 2000 r/min |
| Reference Grease Quantity Gref (cm³) | 420 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 224 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 8050 N/µm |
| Material | |
| Lubrication Groove Width | 16.7 mm |
| Lubrication Holes (qty × Ø mm) | 3 |
| Weight (kg) | 52 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 342 |
NNU 4960 B/SPW33 420 mm 300 mm 118 mm Frequently Asked Questions about NNU 4960 B/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
For international ocean and air freight, CHG Bearing packs NNU 4960 B/SPW33 with industrial VCI anti-corrosion barrier wrapping, sealed polybags, individual cartons, and fumigated ocean-worthy wooden crates. This multi-layer barrier guarantees rust-free storage for a minimum shelf life of 24 to 36 months.
Built for demanding industrial environments, the NNU 4960 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.
Yes, CHG Bearing works closely with industrial OEMs and brand distributors. We offer turnkey custom engineering for NNU 4960 B/SPW33, including laser-etched customer logos, custom internal radial clearances, specialized grease formulations, and bespoke protective packaging.
Yes, 100% of NNU 4960 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.
