Zibo Najie International Trade Co.,Ltd.
Converging excellence, triumphing together
Add to Cart
In the world of precision strip rolling, such as in Sendzimir (Z-Mill) or cluster mills, the backup roll bearing is not merely a component—it is the fundamental element defining mill performance. These bearings must provide absolute rigidity to prevent roll deflection, operate with micron-level precision to ensure perfect strip profile and surface finish, and withstand high speeds with minimal heat generation. Any compromise in bearing quality directly translates to gauge variation, strip defects, and lost productivity.
Our P4 super-precision cylindrical roller bearings are engineered to be the definitive solution for the most demanding cluster mill applications. Manufactured to ISO P4 (SP) tolerance levels, they guarantee exceptional running accuracy and minimal vibration, which is paramount for producing high-quality stainless steel, non-ferrous metals, and specialty alloys.
· Extreme Rigidity: The multi-row, full-complement or cage-guided design provides maximum radial support, drastically reducing work roll deflection and ensuring consistent strip thickness across the entire roll barrel length.
· Ultra-Lightweight Design: Utilizing advanced materials and precision machining, we minimize the bearing's moment of inertia, allowing for faster acceleration and deceleration of the roll stack, which is critical for modern rolling schedules.
· Superior High-Speed Capability: Precision-ground rollers and raceways, along with optimized roller guidance systems, minimize friction and heat build-up, enabling stable operation at the high speeds required for efficient production.
Every bearing is manufactured in a climate-controlled cleanroom environment to ensure flawless cleanliness. Each undergoes 100% individual testing, including advanced vibration analysis (VIP testing), to ensure it meets the strictest performance criteria for noise and rotational accuracy before it leaves our factory.
· P4 Super-Precision: Manufactured to ISO P4 (SP) standards for unmatched running accuracy, ensuring perfect strip profile and superior surface finish.
· Maximum Rigidity: Multi-row, full-complement design provides exceptional support to minimize work roll bending under extreme rolling forces.
· Minimum Inertia: Advanced design and materials reduce weight for improved dynamic response and faster mill acceleration.
· High-Speed Thermal Management: Optimized internal geometry and premium lubricants reduce friction and heat generation, enabling higher rolling speeds.
· Ultra-Quiet Operation: Subjected to selective assembly and vibration testing to ensure exceptionally low noise levels (VIP values).
· Increased Yield: By enabling tighter tolerances and reducing strip defects, our bearings directly increase the output of first-quality product.
· Sendzimir Mills / Z-Mills: 20-high, 18-high, 12-high cluster mills.
· Cluster Cold Rolling Mills: For stainless steel, silicon steel, copper, brass, and other high-precision alloys.
· Foil Mills: For ultra-thin gauge rolling.
· Processing Lines: Tension levelers, skin pass mills.
· Technical Specialists: We focus on the niche of ultra-precision mill bearings, not just standard industrial products.
· Full Customization: We can reverse-engineer and produce bearings based on your sample or drawings, including special sizes, coatings, and markings.
· Global Service & Support: Our technical team provides application support and failure analysis to help optimize your rolling process.
· Competitive Pricing: We offer OEM-level quality at a more competitive price, reducing your overall operating costs.