Ba257-1 257*315*30mm Excavator Bearing for Heavy Machinery OEM Supply
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mm
Bore (d)
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mm
O.D. (D)
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rpm
Limit Speed
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Grade
Vibration
* Detailed specifications in the full parameter table below.
| Parameter | Value | Notes |
|---|---|---|
| Bearing Model | Ba257-1 257*315*30mm Excavator Bearing for Heavy Machinery OEM Supply | NSK Standard Designation |
| Bore Diameter (d) | -- mm | Inner ring bore |
| Outer Diameter (D) | -- mm | Outer ring OD |
| Width (B) | -- mm | Bearing width |
| Dynamic Load Rating (Cr) | -- kN | ISO 281 |
| Static Load Rating (Cor) | -- kN | ISO 76 |
| Limiting Speed (grease) | -- rpm | Grease lubrication |
| Limiting Speed (oil) | -- rpm | Oil lubrication |
| Vibration Grade | -- | Z1V1 / Z2V2 / Z3V3 / Z4V4 |
| Noise Level | ≤ -- dB | Tested per NSK standard |
| Radial Clearance | CN / C3 / C4 | Per ISO 5753 |
| Seal / Shield Type | ZZ / DDU / Open | Contact / Non-contact |
| Precision Grade | ABEC-1 / ABEC-3 | ISO P0 / P6 |
| Lubrication | NSK Grease | Pre-lubricated at factory |
| Material (Rings) | Chrome Steel | GCr15 / SAE52100 |
| Material (Balls) | Chrome Steel | High-purity grade |
| Material (Cage) | Steel / Nylon | Steel pressed / PA66 |
| Operating Temperature | -20°C ~ +120°C | Standard grease range |
| Weight | -- g | Approximate |
| RoHS Compliance | Yes | Restriction of Hazardous Substances |
* Specifications subject to NSK factory datasheet. Contact us for model-specific certified data sheets.
Ba257-1 257*315*30mm Excavator Bearing for Heavy Machinery OEM Supply is optimized for high-speed, low-noise environments across motors, robotics, and industrial automation.
Ideal for BLDC motors, servo motors, and household appliance motors requiring ultra-low noise and high rotational stability.
Precision joint rotation and end-effector drives in collaborative robots and industrial arms demand consistent low-vibration performance.
CNC spindles, conveyor drives, and pick-and-place machines benefit from high-speed capability and batch-consistent quality.
EPS steering systems, EV drive units, and HVAC blowers require bearings that meet automotive-grade noise and durability standards.
Medical devices, semiconductor equipment, and optical instruments depend on extremely smooth, repeatable rotation with minimal runout.
Air conditioning compressors, wind turbine pitch drives, and pump systems require long-life, low-maintenance bearing solutions.
Optimized cage geometry reduces ball-cage contact stress at high speeds, enabling sustained operation up to 80,000 rpm with minimal heat generation.
Every batch is tested on NSK-calibrated vibration benches. Z4V4 grade ensures ≤32 dB noise, critical for servo motors and precision spindles.
Vacuum-degassed chrome steel with controlled inclusion size. Superfinished raceways minimize micro-vibration and extend fatigue life by up to 30%.
NSK-specific greases matched to operating temperature and speed range. Correct fill volume prevents churning losses and ensures stable lubrication film.
Performance Benchmarks
50+
Countries
ISO 9001
Certified
24h
Quote Reply
Shanghai Dunyu Bearing Co., Ltd. is an officially authorized NSK distributor. All products sourced directly from NSK factories.
★ OFFICIALEvery order ships with NSK inspection certificates, vibration test reports, and ISO 9001 quality documentation.
ISO 9001Production batch codes traceable to NSK factory output. Enables full supply chain audit and counterfeit prevention.
TRACEABLEDedicated technical support team. Replacement guarantee for quality issues. Ongoing application engineering consultation.
SUPPORTEDDocumentation Included with Every Order
No extra charge. Shipped with the product.
Genuine NSK branded boxes with holographic authentication seals. Tamper-evident packaging ensures product integrity from factory to delivery.
Anti-static PE bags and foam inserts protect precision surfaces during transit. Critical for ESD-sensitive motor and electronics applications.
Neutral white box, custom label printing, or client-branded packaging available. MOQ and lead time vary by order volume.
Each package labeled with batch number, production date, and QR-traceable code. Supports incoming inspection and inventory management.
Shipping Info
Yes. Shanghai Dunyu Bearing Co., Ltd. is an officially authorized NSK distributor. All products are sourced directly from NSK factories with full traceability documentation. Each shipment includes NSK inspection certificates and batch codes traceable to factory output.
We stock bearings across Z1V1 to Z4V4 grades. Z4V4 (≤32 dB) is available for high-precision motor and spindle applications. Please specify your noise requirement when requesting a quote and we will confirm availability and lead time.
MOQ is flexible and adapted to project scale. Sample orders of 1-10 pieces are accepted for performance verification. For mass production, we offer volume pricing and dedicated inventory reservation. Contact us to discuss your specific production volume.
Standard in-stock models ship within 3-7 business days from Shanghai via DHL, FedEx, UPS, or SF Express. For large volumes or special grades, lead time is confirmed at order placement. Export documentation including CO, commercial invoice, and packing list is included.
Yes. We offer NSK original packaging, neutral white box, or fully customized branded packaging. Anti-static PE bags and foam inserts are standard. Custom label printing and barcode requirements can be accommodated. Please discuss your packaging specifications with our sales team.
Every order ships with NSK inspection certificates, vibration and noise test reports, ISO 9001 quality control records, and a packing list. Certificate of Origin is available on request. All documentation is provided at no additional charge.
Our engineering team provides free application matching support. Share your motor type, operating speed, load conditions, and noise requirements. We will recommend the optimal NSK model, seal type, clearance class, and vibration grade. Reply within one business day.
Share your model number, quantity, and application requirements. Our engineering team delivers a formal quotation with complete quality certificates within 24 hours.
Inquiry Form
Ba257-1 257*315*30mm Excavator Bearing for Heavy Machinery OEM Supply