Manufactured by CHG Bearing, the NP907899/NP385281 is a precision Four-Row Tapered Roller Bearings. Key dimensional parameters include a 510 mm bore diameter, a 655 mm outer diameter, and a 377 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.
NP907899/NP385281 - Four-Row Tapered Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NP907899/NP385281 |
| Brand | CHG® |
| Characteristics | |
| Bearing Type | Four Row Tapered Roller Bearing |
| Number of Rows | Four Row |
| Tolerance Class | P0 |
| Dimensions | |
| Bore Diameter (d) | 510 mm |
| Width (B) | 377 mm |
| Outer Diameter (D) | 655 mm |
| Bore Diameter Tolerance | -0.050 – 0 mm |
| Outside Diameter Tolerance | -0.075 – 0 mm |
| Inner Ring Chamfer | 6 min mm |
| Outer Ring Chamfer | 6.4 min mm |
| Inner Ring Assembly Width Tolerance | -1 – +1 mm |
| Outer Ring Assembly Width | N/A mm |
| Outer Ring Assembly Width Tolerance | -1 – +1 mm |
| Shaft Abutment Diameter | 526 mm |
| Housing Abutment Diameter | 628 mm |
| Lubrication Hole Diameter | 9 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 5220 kN |
| Basic Static Load Rating C0 (kN) | 17900 kN |
| Material | |
| Mass (kg) | 316 kg |
| Ring Material | Case-Hardened Steel / Bearing Steel |
| Rolling Element Material | Case-Hardened Steel / Bearing Steel |
| Cage Material | Grade 45 Steel / 08Al Steel / Grade 10 Steel |
| Lubrication Groove Width | 20 mm |
NP907899/NP385281 655 mm 510 mm 377 mm Frequently Asked Questions about NP907899/NP385281 Four-Row Tapered 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 NP907899/NP385281 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.
For international ocean and air freight, CHG Bearing packs NP907899/NP385281 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.
Yes, 100% of NP907899/NP385281 Four-Row Tapered 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 NP907899/NP385281 Four-Row Tapered 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.
