Cylindrical Roller Bearing
ISO 9001 Certified
TS 16949
Genuine SKF
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Cylindrical Roller Bearing
NTN Koyo Timken N303em N304em N305em Cylindrical Roller Bearing
Experience smoother machinery operation and extended equipment life with our precision-engineered Cylindrical Roller Bearing collection, featuring trusted brands NTN, Koyo, and Timken. These N303em, N304em, and N305em models deliver consistent radial load handling to keep your industrial systems running at peak performance, even under heavy workloads.
- Engineered with EM-type cages for reduced friction and enhanced heat dissipation, ideal for high-speed applications
- Direct replacement for worn bearings in pumps, gearboxes, and electric motors, minimizing downtime during maintenance
- Precision-ground raceways ensure quiet operation and reliable torque transmission, addressing common vibration-related issues in 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
Spécifications du produit
| N303em, N304em, N305em |
| Design Standard |
Adéquation de l'application
| Pump assemblies, cylinder mechanisms |
Need Reliable N303em, N304em, N305em Cylindrical Roller Bearings? Here’s What Matters
Procuring the right cylindrical roller bearings often means navigating confusing model variations across brands like NTN, Koyo, and Timken. Mismatched dimensions lead to costly installation delays, while low-quality bearings frequently fail prematurely under heavy loads—problems we’ve solved for manufacturers across industrial sectors.
Conçu pour des performances constantes dans des conditions exigeantes
Our cylindrical roller bearings follow precise dimensional standards compatible with major international brands, eliminating the guesswork in cross-brand replacement. Produced under ISO 9001-certified processes, each bearing undergoes rigorous material and dimensional inspections to ensure it meets the load requirements of applications from conveyor systems to hydraulic pumps. With extensive inventory across NTN, Koyo, Timken, and other trusted brands, we provide immediate access to the exact cylindrical roller bearing you need. Designed to handle high radial loads with minimal friction, these cylindrical roller bearings excel in rotating equipment operating at moderate to high speeds. Their robust construction makes them ideal for continuous-duty machinery in steel mills, automotive production lines, and industrial gearboxes where reliable performance directly impacts productivity and maintenance schedules. Caractéristiques d'ingénierie critiques pour une longue durée de vie
The N303em, N304em, and N305em series incorporate precision-ground raceways and rollers that distribute load evenly, reducing stress concentrations and extending fatigue life. The “em” design typically indicates enhanced internal geometry for improved lubricant retention—a critical factor in minimizing wear in poorly accessible installations. Tight dimensional tolerances ensure consistent fit across installations, while heat-treated components maintain structural integrity even under temperature fluctuations common in industrial environments. Coût total de possession: pourquoi la qualité importe plus que le prix
Choosing a properly specified cylindrical roller bearing directly impacts operational costs. Inferior bearings with substandard hardness or imprecise dimensions often fail within months, causing unplanned downtime and potentially damaging adjacent components. Our bearings, manufactured to strict quality standards, reduce replacement frequency and maintenance labor—delivering lower total cost of ownership compared to cheaper alternatives. Properly selected bearings also optimize energy efficiency by minimizing friction losses during operation. Qualité sur laquelle vous pouvez compter
Every cylindrical roller bearing in our inventory passes through comprehensive quality checks, including dimensional verification, surface hardness testing, and visual inspection. We maintain ISO 9001-certified procedures throughout our supply chain, from raw material selection to final packaging. All bearings come with a manufacturer-backed warranty covering material and production defects. With access to both international brands and domestic manufacturers, we can fulfill orders for specific brand requirements or equivalent alternatives based on your application needs. Emballage industriel standard avec protection pour éviter les dommages pendant le transport
Options d'expédition flexibles incluant le courrier express, le fret aérien et le transport maritime Obtenez votre devis de roulement à rouleaux cylindriques dès aujourd'hui
Whether you need NTN, Koyo, Timken, or equivalent N303em, N304em, N305em cylindrical roller bearings, we can provide competitive pricing and availability. Simply share your required model, quantity, and delivery location, and our technical team will confirm specifications and lead times to ensure you get the right bearing for your application. Foire aux questions Q: Do you supply cylindrical roller bearings from other brands besides those listed? A: Yes, we offer comprehensive sourcing across all major international and domestic brands. We can provide bearings matching your specified brand or equivalent alternatives based on dimensional and performance requirements. Q : Comment puis-je confirmer que ces roulements conviendront à mon équipement ?
A: Provide your existing bearing model number or critical dimensions (bore diameter, outer diameter, width), and our technical team will verify compatibility with your application requirements. Q : Quelle est votre politique de garantie pour les roulements à rouleaux cylindriques ?
A: All bearings come with a manufacturer warranty covering material and production defects. Warranty duration varies by brand, with specific terms detailed in your order confirmation. Q : Quelle est la quantité minimale de commande pour ces roulements ?
A: We support low minimum order quantities, including single-unit purchases for maintenance needs, with volume pricing available for larger production orders. Q: À quelle vitesse pouvez-vous expédier les roulements en stock ? A: In-stock cylindrical roller bearings are dispatched the same business day for orders received before 12:00 GMT, with delivery times varying by shipping method and destination. Q: Proposez-vous des solutions de roulements sur mesure ?
A: Yes, we provide OEM/ODM services for special applications. Contact our technical team with your drawings or performance specifications for a custom solution quote. Ready to order or need a quote?Optimal Performance in Heavy-Radial Load Applications
Packaging & Shipping
Send the bearing model, dimensions (d x D x B), and quantity — we’ll get back to you with pricing and lead time.
Contact us via email or our online inquiry form
Product Summary
- Product Name
- NTN Koyo Timken N303em N304em N305em Cylindrical Roller Bearing
- 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
Get a custom quote for
NTN Koyo Timken N303em N304em N305em Cylindrical Roller Bearing
NDA protected · Free samples for orders > $50K · Reply within 12 hours
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