-- SKF Authorized Engineering Partner
Ensure smooth, reliable operation in your machinery with premium NTN Cylindrical Roller Bearing models NJ340EM, NU340EM, NJ344EM, and NU344EM. Engineered to handle heavy radial loads while minimizing friction, these bearings deliver consistent performance even in high-vibration environments (Z1V1 to Z3V3 ratings) and adapt seamlessly to grease or oil lubrication.
15+ Certified Engineers On-Call
Free application analysis · Failure diagnosis · Custom modification guidance. Response within 24 hours.
| Parameter | Details |
|---|---|
| Model Number | 6306N, 6306NR, 6306-2RS1, NJ340EM, NU340EM, NJ344EM, NU344EM |
| Bearing Type | Cylindrical Roller Bearing |
| Specification | 30*72*19mm |
| Stock | Rich Stocks |
| Grease Technology | High |
| Lubrication | Grease or Oil |
| Vibration | Z1V1, Z2V2, Z3V3 |
| Service | OEM, ODM |
| Delivery | by Express, Road, Train, Air, Sea |
| Sample | Available |
| on-Time Delivery Rate | 100.0% |
| Response Time | Less Than 0.5h |
| Transport Package | Carton, Pallet |
| Trademark | BDL/NTN/NSK/NMB/Koyo/NACHI/Timken |
| Origin | China |
| HS Code | 8482102000 |
| Production Capacity | 200000000 Pieces/Year |
| Industry | Typical Applications |
|---|---|
| Industrial Machinery | Rotary shafts, gearboxes, conveyor systems |
| Automotive | Transmission components, wheel hubs |
| Heavy Equipment | Hydraulic pumps, mechanical presses |
Finding the right cylindrical roller bearing can be frustrating—mismatched dimensions causing installation delays, unclear lubrication requirements leading to premature failure, or limited brand options forcing multiple supplier comparisons. As a bearing specialist, we’ve seen how these issues disrupt operations and increase costs.
Our cylindrical roller bearings, including models NJ340EM, NU340EM, NJ344EM, NU344EM, and 6306 series, address these challenges with ISO 9001-certified production processes and comprehensive inventory. Whether you need standard sizes like 30*72*19mm or specific designs (caged, sealed, or with snap rings), we cover both自有 brand and international series to meet equipment specifications.
These bearings excel in high-load industrial environments where radial force handling and precision matter. With vibration grades Z1V1 to Z3V3, they maintain stability in applications like conveyor systems and gearboxes. The dual lubrication option (grease or oil) ensures adaptability to operating temperatures and maintenance schedules, reducing unplanned downtime.
Three critical specifications define their performance: the 30*72*19mm dimension precision ensures drop-in replacement compatibility with major international standards; high-grade grease technology minimizes friction under heavy loads; and Z-class vibration control reduces noise and wear in high-speed operations. Surface hardness and heat treatment processes further enhance resistance to fatigue, extending service life in continuous-duty machinery.
Choosing the right cylindrical roller bearing directly impacts total operational cost. A bearing with incorrect clearance or lubrication can fail within months, leading to equipment downtime, repair labor, and replacement expenses. Our Z3V3 vibration-rated bearings, for example, reduce premature wear in high-speed applications, lowering long-term maintenance costs compared to lower-grade alternatives.
Every bearing undergoes rigorous inspection, from raw material testing to final dimensional and hardness checks, ensuring compliance with industry standards. We offer a warranty against manufacturing defects and maintain rich stock levels for quick delivery. With an on-time delivery rate of 100.0% and response time under 0.5 hours, we provide reliable support for both planned maintenance and urgent replacements.
Whether you need NJ340EM, NU340EM, NJ344EM, NU344EM, 6306 series, or other cylindrical roller bearings, provide your model, dimensions, and quantity. Our team will confirm availability and deliver a competitive quote, helping you secure the right parts without delay.
Q: Do you supply bearings from other brands or models?
A: Yes, we support inquiries for all brands and models, supplying according to customer-specified standards.
Q: How can I confirm if this bearing fits my equipment?
A: Provide your equipment’s required dimensions (d x D x B) or model number, and our technical team will verify compatibility.
Q: What is your warranty policy?
A: We offer a warranty against manufacturing defects; specific terms are detailed in the sales contract.
Q: What is the minimum order quantity?
A: We accept low minimum orders, including small quantities for trial or emergency repairs.
Q: How long does shipping take?
A: In-stock items ship immediately; delivery time depends on the selected method (Express, Air, Sea, etc.).
Q: Can you produce custom (OEM/ODM) bearings?
A: Yes, we offer OEM/ODM services based on customer drawings or specifications.
Ready to order or need a quote?
Send the bearing model, dimensions (d x D x B), and quantity — we’ll get back to you with pricing and lead time.
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Official partner since 1998 with direct access to SKF technical resources, genuine products, and engineering expertise.
In-house team provides application design, failure analysis, and predictive maintenance -- reducing bearing failures by 35%.
Every product undergoes rigorous pre-shipment inspection with full documentation for traceability and compliance.
Dedicated account managers and reliable delivery networks ensure on-time supply for enterprise clients worldwide.
Performance Metrics
35%
Failures Prevented
70%
Downtime Reduction
25+
Years Experience
24h
Quote Response
78% of large enterprises prefer suppliers offering integrated technical support and lifecycle services.
Custom bearing selection and system design based on your specific load conditions, speeds, temperatures, and environmental factors.
Root-cause investigation of bearing failures using metallurgical testing, vibration analysis, and operating data review.
IIoT-enabled monitoring with smart sensor bearings for real-time vibration, temperature, and RPM tracking.
Modified bearings with special coatings, seals, tolerances, or materials. Lead time 8-12 weeks from official channels.
Certified engineers available for on-site installation support, alignment checks, and commissioning assistance worldwide.
Long-term service agreements including regular maintenance checks, replacement scheduling, and performance reporting.
Free samples available for orders over $50K
Validated against your KPIs before full production commitment.
-- Get In Touch
Our certified engineers will review your application requirements and provide a detailed quote within 24 hours.
Address
No. 377 Bansongyuan Road, Huangpu District, Shanghai, China
Free Sample Program
Orders over $50K qualify for free product samples
Test against your KPIs before full production commitment. Ask our engineers for details.
Regarding: NTN NJ340EM NU340EM NJ344EM NU344EM Cylindrical Roller Bearing
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