Four Row Cylindrical Roller Bearing NJ321 NJ326 NJ328 NJ338 NJ340EM for Industrial Machinery High Precision P0-P4

Product Specifications

Application Industries

Minimize Downtime with High Precision Four Row Cylindrical Roller Bearings NJ321-NJ340EM

Equipment failure due to bearing issues can halt production lines, costing thousands in lost output. Many manufacturers struggle with sourcing reliable bearings that balance precision, durability, and delivery speed—especially when dealing with specialized industrial machinery. Inconsistent quality from uncertified suppliers often leads to premature wear, while minimum order quantities force overstocking or delayed repairs.

Engineered for Reliable Performance in Critical Machinery

Our Four Row Cylindrical Roller Bearings are designed to address these challenges, offering a seamless solution for industrial machinery operators. With precision ratings from P0 to P4 and noise grades up to Z4, these bearings deliver consistent performance in high-load applications. As an integrated manufacturer with ISO9001 and ISO14001 certifications, we ensure each bearing meets strict quality standards, supported by a full R&D team and QC lab. Whether for machine tool spindles, printing presses, or reducers, our bearings provide the stability needed to keep operations running smoothly.

Optimal Performance in Demanding Industrial Environments

These cylindrical roller bearings excel in radial load applications, where their separated design allows for easy installation and maintenance. Constructed from high-grade bearing steel, they withstand heavy loads and continuous operation—critical for machinery in manufacturing, agriculture, and construction. The ability to use either grease or oil lubrication adds versatility, adapting to varying speed and temperature conditions. For industrial machinery makers prioritizing durability and technical matching, the NJ series bearings offer a reliable rotation solution that minimizes downtime and extends equipment lifespan.

Technical Precision That Drives Operational Efficiency

Key technical features set these bearings apart in industrial applications. The precision rating (P0-P4) directly impacts rotational accuracy; higher grades like P4 reduce vibration and noise, essential for precision machinery such as CNC tools. Vibration levels (Z1V1-Z3V3) ensure smooth operation, preventing excessive wear on connected components. The separated structure allows for independent mounting of inner and outer rings, simplifying replacement and reducing maintenance time. Additionally, the radial load design optimizes load distribution, enhancing dynamic performance and extending bearing life under continuous operation.

Long-Term Value Through Quality and Reliability

Choosing genuine, high-precision bearings eliminates the hidden costs of counterfeit or substandard products. Inferior bearings often fail prematurely, leading to unplanned downtime, costly repairs, and potential damage to expensive machinery. Our bearings, backed by a 12-month global warranty, offer peace of mind with defect replacement and refund options. By focusing on total cost of ownership—rather than upfront price—manufacturers reduce long-term expenses and ensure consistent production output. With ISO certifications and strict quality control, each bearing meets international standards, making them a trustworthy choice for critical industrial applications.

Why Industrial Buyers Partner With Us

Packaging & Shipping

• Secure carton and pallet packaging to prevent damage during transit
• Sample lead time: 3–5 days; bulk delivery: 5–15 days
• Flexible shipping options: T/T, credit card, and Alibaba trade payments accepted
• Global logistics support with tracking available for all orders
• 1pc MOQ for standard items, ideal for emergency repairs and small-batch needs

Get Your Industrial Bearings Delivered Fast

Don’t let bearing issues slow down your production. Send us your specific model requirements, application details, and quantity, and our team will provide a quote within 24 hours. With our reliable supply chain and fast lead times, you can minimize downtime and keep your machinery operating at peak efficiency. Order today to experience the difference of precision-engineered bearings backed by responsive service.

Frequently Asked Questions