Cylindrical Roller Bearing
ISO 9001 Certified
TS 16949
Genuine SKF
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Cylindrical Roller Bearing
NTN N321EM Cylindrical Roller Bearing – High-Precision, Heavy-Duty, ISO Standard
Product Specifications
| Bore Diameter | 15–90 mm |
| Outer Diameter | 35–180 mm |
| Width/Thickness | 49 mm |
Introduction
This NTN cylindrical roller bearing (Model N321em) is made of high-grade bearing steel, designed for radial load applications. It features non-aligning spherical structure, precision ratings from P0 to P2, and supports grease or oil lubrication. Ideal for OEM/ODM use with low vibration (Z1V1–Z3V3) and reliable performance in industrial machinery.7
Day Prototype
vs. 8-12 wks standard
50+
Countries Served
Global logistics network
12h
Quote Response
Expert engineers on call
Typical Applications
Wind Power
Mining
Steel & Metallurgy
Automotive / EV
Rail Transit
Precision Machinery
Genuine SKF Bearings
NDA Protected
Free Sample for Orders > $50K
Global Shipping
Product Details
NTN Japan Cylindrical Roller Bearing N321EM Series – Precision, Durability & OEM-Ready Performance
| Description | Key Specification |
|---|---|
| Ultra-Precise Radial Load Handling | Rated for heavy radial loads; ideal for high-speed industrial gearboxes & motors |
| Japanese-Built Quality | Made in Japan with JIS G4805 bearing steel — strict dimensional & metallurgical control |
| Multiple Mounting Options | N321EM / NJ321EM / NF321EM / NU321EM / NUP321EM — optimized for fixed/floating/locating arrangements |
| Tight Tolerance Grades | P0 (standard) to P2 (ultra-precision); compliant with ISO 492 & JIS B1514 |
| Vibration-Optimized | Z1V1 to Z3V3 grading — ensures smooth operation in precision machine tools & pumps |
| Robust Sealing & Lubrication | Grease- or oil-lubricated; compatible with SKF LGMT 2 & LGLT 2 greases |
| Compact, High-Capacity Design | 105 × 225 × 49 mm (d×D×B); 15–90 mm bore range; 35–180 mm OD — maximizes load density |
| OEM/ODM Supported | Full documentation, traceable batch logs, and custom packaging available |
| Global Compliance | HS Code 8482500090; meets RoHS, REACH, and ISO 9001 manufacturing standards |
| Why Choose NTN Over Generic Brands? | Lower noise, longer L10 life (>2x vs. non-Japanese equivalents), and superior roller profile grinding accuracy |
Applications: Steel mill rollers, wind turbine gearboxes, mining conveyors, CNC lathes, and railway axle boxes.
FAQ: Q: Are these bearings interchangeable with SKF NU321E? A: Yes — identical dimensions & load ratings; NTN offers tighter vibration control. Q: Can I get P4 grade with Z2V2? A: Yes — lead time +2 weeks. Q: Do you supply grease-filled versions? A: Standard is dry; grease-fill optional (specify NLGI grade).
Need technical support or volume pricing? Send your inquiry now — our NTN-certified engineers reply within 2 business hours.
Product Summary
- Product Name
- NTN N321EM Cylindrical Roller Bearing – High-Precision, Heavy-Duty, ISO Standard
- Category
- Cylindrical Roller Bearing
- Brand
- SKF
- Certification
- ISO 9001 · TS 16949
- Lead Time
- 7 Working Days
Get a Custom Quote
Our engineers will respond within 12 hours with a tailored solution.
Request QuoteGeneral Specifications
| Bearing Type | Cylindrical Roller Bearing |
| Brand | SKF |
| Quality Standard | ISO 9001 / TS 16949 |
| Precision Grade | P0 / P5 / P6 (custom) |
| Material | Chrome Steel / Stainless |
| Cage Material | Steel / Brass / Polyamide |
| Lubrication | Grease / Oil (specify) |
| Operating Temp. | -40°C to +200°C |
| Min. Order Qty | 1 pc (samples available) |
| Prototype Lead Time | 7 Working Days |
Performance Parameters
| Load Capacity | Contact for C0/Cr values |
| Speed Rating | Contact for ndm limit |
| Vibration Level | Z1 / Z2 / Z3 (custom) |
| Noise Level | V1 / V2 / V3 (custom) |
| Fatigue Life | L10h per ISO 281 |
| Sealing Options | Open / Z / 2Z / RS / 2RS |
Custom Specifications Available
Our engineering team can modify bearing dimensions, materials, seals, and clearances to meet your specific operating requirements. Submit your drawing or spec sheet for a tailored proposal.
Wind Power
Main shaft bearings, gearbox bearings, and generator bearings for onshore and offshore wind turbines.
Mining & Quarrying
Heavy-duty bearings for crushers, conveyors, and rotary equipment in extreme dust and shock-load environments.
Steel & Metallurgy
High-temperature bearings for rolling mills, continuous casting, and furnace applications.
Automotive / EV
Wheel hub bearings, transmission bearings, and e-motor bearings for passenger and commercial vehicles.
Rail Transit
Axle box bearings, traction motor bearings, and gearbox bearings meeting EN/UIC railway standards.
Precision Machinery
High-precision spindle bearings, angular contact bearings, and super-precision bearings for CNC and robotics.
Application Design
EngineeringOur engineers analyze your operating conditions -- load, speed, temperature, environment -- and select or design the optimal bearing solution to maximize service life and reduce total cost of ownership.
Custom Modification
7-Day TurnaroundNeed non-standard dimensions, special materials, or modified clearances? We can modify standard SKF bearings or manufacture fully custom solutions with a 7-day prototype turnaround.
Failure Analysis
DiagnosticsWhen bearings fail prematurely, our team conducts root-cause analysis using advanced diagnostic tools to identify the failure mode and recommend corrective action.
Predictive Maintenance
Up to 40% Less DowntimeWe deploy vibration monitoring, thermal imaging, and oil analysis programs that detect bearing deterioration early -- reducing unplanned downtime by up to 40%.
On-site Installation
Global CoverageProper installation is critical to bearing performance. Our certified technicians provide on-site installation support, alignment verification, and operator training worldwide.
Lifecycle Support
Enterprise SLAFrom initial selection through end-of-life, our dedicated account managers provide scheduled maintenance plans, re-lubrication programs, and replacement forecasting for enterprise clients.
Why SKF China
The engineering partner advantage
7 Days
Prototype Lead Time
vs. 8-12 weeks via standard channels
15+
Certified Engineers
SKF-certified, on-call for your project
50+
Countries Delivered
Reliable global logistics network
Request a Quote
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NTN N321EM Cylindrical Roller Bearing – High-Precision, Heavy-Duty, ISO Standard
NDA protected · Free samples for orders > $50K · Reply within 12 hours
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