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Cylindrical Roller Bearing NF309EM 45x100x25mm for Automotive Machinery OEM Supply thumbnail 1
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Cylindrical Roller Bearing NF309EM 45x100x25mm for Automotive Machinery OEM Supply - Dimension thumbnail 4
NTN GENUINE
IN STOCK
Cylindrical Roller Bearing NF309EM 45x100x25mm for Automotive Machinery OEM Supply
Cylindrical Roller Bearing NF309EM 45x100x25mm for Automotive Machinery OEM Supply - Side View
Cylindrical Roller Bearing NF309EM 45x100x25mm for Automotive Machinery OEM Supply - Detail
Cylindrical Roller Bearing NF309EM 45x100x25mm for Automotive Machinery OEM Supply - Dimension
Model
NTN-252
Origin
JAPAN
Lead Time
5-7 DAYS
NTN AUTHORIZED · OEM SUPPLIER

Cylindrical Roller Bearing NF309EM 45x100x25mm for Automotive Machinery OEM Supply

MODEL: NTN-252 100% Genuine · Traceable

Ensure seamless automotive machinery performance with the Cylindrical Roller Bearing NF309EM, engineered to deliver reliable radial load handling and precise operation in critical OEM applications. This 45x100x25mm bearing features separated inner and outer rings for easy installation and maintenance, reducing downtime during assembly or replacement.Single row design with open seals optimizes lubrication flow, ideal for high-speed automotive machinery where heat dissipation is keyManufactured from premium bearing steel with precision ratings from P0 to P2, ensuring batch consistency for production line reliabilityBacked by NTN's authorized supply chain, providing full traceability documentation to streamline customs clearance and quality compliance

Key Specifications
SPEC-01
Bore (d)
45mm
OD (D)
100mm
Width (B)
25mm
Dyn. Load Cr
183 kN
Stat. Load C0
220 kN
Lim. Speed
3,800 rpm
Request Quotation Now
24H
Quote Reply
5-7D
Sample Ship
100%
Genuine
SECTION 05 / FULL SPECIFICATIONS

Complete Technical Parameters

All specifications strictly follow NTN factory standards. Data verified against original NTN catalogue with full ISO 9001 compliance.

Dimensions DIM
Bore Diameter (d)45 mm
Outer Diameter (D)100 mm
Width (B)25 mm
Chamfer (rs min)2.1 mm
Net Weight1.85 kg
Performance PERF
Dynamic Load Rating (Cr)183 kN
Static Load Rating (C0r)220 kN
Limiting Speed (Grease)3,800 rpm
Limiting Speed (Oil)5,000 rpm
Fatigue Load Limit (Pu)23.6 kN
Construction CONST
Bearing TypeCylindrical Roller Bearing
Cage MaterialPressed Steel
Sealing TypeOpen / 2RS / ZZ
Internal ClearanceCN / C3 / C4
Tolerance ClassP0 / P6 / P5
Operating Conditions OP
Temperature Range-30°C ~ +120°C
LubricationGrease / Oil
Vibration ClassZ2 / Z3 / Z4
StandardJIS B 1518 / ISO 281
OriginJapan (NTN Factory)
SECTION 06 / INDUSTRY APPLICATIONS

Compatible Equipment & Industries

Validated by 2,400+ OEM customers across 50+ countries. Engineered for high-reliability operation in demanding industrial environments.

01

Steel Mills

Heavy-duty rolling mills, continuous casters, hot strip mills with shock-absorbed design.

02

Mining Equipment

Crushers, vibrating screens, conveyors operating under extreme loads and contamination.

03

Paper Machines

Drying cylinders, calenders, press rolls requiring vibration damping.

04

Conveyor Systems

Belt conveyors, idlers, drive pulleys for ports, logistics and manufacturing lines.

05

Cement & Aggregate

Vibrating equipment, crushers, kilns demanding misalignment tolerance.

06

Wind Power

Main shaft, gearbox, generator bearings for onshore and offshore turbines.

07

Petrochemical

Pumps, compressors, blowers in chemical processing and refining plants.

08

Construction Machinery

Excavators, cranes, loaders, drilling rigs working under impact loads.

09

Marine & Offshore

Propulsion shafts, deck machinery, anti-corrosion sealed for marine environment.

SECTION 07 / ENGINEERING DEEP DIVE

Why NTN Outperforms in Critical Applications

From raceway geometry to surface micro-finish, every parameter is engineered for L10 life extension and consistent batch performance.

MATERIAL

Premium Carburized Steel

High-purity SUJ2 / 100Cr6 bearing steel with vacuum degassing. Carburized case depth precisely controlled at 2.5-3.5mm with HRC 60-62 surface hardness.

  • Oxygen content ≤ 8 ppm -- minimizes inclusion-induced fatigue cracks
  • Compressive residual stress on raceway surface for crack resistance
  • 40% L10 life improvement vs. industry standard steel
SEALING

Multi-Lip NBR / FKM Seals

Choice of contact (2RS), non-contact (2Z) and metal shielded (ZZ) options. Designed for IP65 dust ingress protection and grease retention.

  • NBR rated -40°C ~ +120°C / FKM rated up to +200°C
  • Garter spring tension calibrated for low torque & long sealing life
  • Customizable food-grade FDA compliant variants available
PRECISION

P0 to P5 Tolerance Class

Precision grades from standard P0 up to P5 (ISO Class 5) for high-speed spindle applications. Inspected on Mahr / Talyrond CMM equipment.

  • Bore tolerance ±2μm (P5) / Radial runout ≤ 4μm
  • Raceway roundness controlled within 0.8μm
  • Vibration class Z2/Z3/Z4 for low-noise applications
CLEARANCE

CN / C3 / C4 Internal Clearance

Internal radial clearance optimized per application -- CN for general use, C3 for thermal expansion, C4 for high-temperature environments.

  • Optimized load distribution under interference fits
  • Thermal expansion accommodation up to ΔT 80°C
  • Custom clearance ranges available for OEM specifications
SECTION 08 / TRUST & TRACEABILITY

100% Genuine NTN.
Traceable. Warranted.

We operate as an officially authorized NTN distributor with an unbroken supply chain. Every bearing carries laser-engraved batch codes that can be verified against NTN's factory database.

Authorized Distributor

Direct sourcing from NTN factories with original brand authorization certificate.

Laser Batch Code

Every bearing engraved with traceable batch ID. Verifiable via NTN factory MES system.

Full Documentation

Mill test certificates, COO, COC, packing list -- all export documents provided.

12-Month Warranty

Standard 12-month quality warranty. Free replacement for verified manufacturing defects.

2,400+
OEM Customers
50+
Countries Served
99.97%
QC Pass Rate
10+
Years Experience
SECTION 09 / PACKAGING & SHIPPING

Export-Ready Packaging, Worldwide Door-to-Door Delivery

Real-time WMS inventory ensures rapid dispatch. Standard NTN moisture-proof packaging with anti-rust treatment for long-term storage.

NTN original packaging with moisture protection
PACKAGING

Original NTN Packaging

  • Inner: NTN-printed plastic tube + VCI anti-rust paper
  • Middle: Original NTN branded carton with batch label
  • Outer: Reinforced export carton, optional wooden pallet
  • Custom: Neutral packaging or customer branding available
Global shipping logistics hub
LOGISTICS

Global Shipping Options

EXPRESS
DHL · FedEx · UPS
3-7 days door-to-door
AIR FREIGHT
Bulk Air Cargo
5-10 days port-to-port
SEA FREIGHT
FCL · LCL
15-35 days, lowest cost
RAIL
CN-EU Express
18-22 days to Europe
EXW · FOB · CIF · DDP -- flexible Incoterms supported
SECTION 11 / FAQ

Frequently Asked
Questions

Common questions from OEM and distributor partners. Can't find an answer? Contact our engineering team directly.

Ask a custom question
Q.01 How can I verify the authenticity of NTN bearings I receive?

Every NTN bearing has laser-engraved batch codes on the inner ring. We provide the original mill test certificate and brand authorization letter with each shipment. You can verify the batch code with NTN factory directly via their official channels.

Q.02 What is the typical lead time and minimum order quantity?

In-stock items ship within 5-7 working days. MOQ starts from 1 piece for samples. Bulk orders for OEM customers benefit from priority production scheduling and consolidated shipping. Custom non-standard bearings typically take 30-45 days.

Q.03 Do you offer OEM customization (clearance, sealing, precision)?

Yes. We support custom internal clearance (CN/C3/C4/C5), sealing options (2RS/ZZ/Open), precision class (P0/P6/P5), special grease, and neutral packaging. Submit your engineering drawing and we will return a feasibility report within 72 hours.

Q.04 What documentation is provided for international shipping?

Standard export documents include: Commercial Invoice, Packing List, Bill of Lading / Air Waybill, Certificate of Origin (Form A / E / FTA), Certificate of Conformity, NTN Mill Test Certificate, and Brand Authorization Letter. Customs HS code and country-specific requirements are pre-checked.

Q.05 What is your warranty and return policy?

We offer a standard 12-month quality warranty from shipping date for verified manufacturing defects. Defective products are replaced free of charge. Failure analysis reports are provided to support root cause investigation. Wear due to misapplication or improper installation is excluded.

Q.06 Can you ship under DDP terms to my country?

Yes. We support EXW, FOB, CIF, CFR, and DDP terms. Our logistics team handles customs clearance, duties, and last-mile delivery for DDP shipments to 50+ countries. For sensitive markets, we recommend DDP to avoid customs delays.

PRODUCT DESCRIPTION

Detailed Product Information

Ensure seamless automotive machinery performance with the Cylindrical Roller Bearing NF309EM, engineered to deliver reliable radial load handling and precise operation in critical OEM applications. This 45x100x25mm bearing features separated inner and outer rings for easy installation and maintenance, reducing downtime during assembly or replacement.

  • Single row design with open seals optimizes lubrication flow, ideal for high-speed automotive machinery where heat dissipation is key
  • Manufactured from premium bearing steel with precision ratings from P0 to P2, ensuring batch consistency for production line reliability
  • Backed by NTN’s authorized supply chain, providing full traceability documentation to streamline customs clearance and quality compliance

Description

Product Specifications

Parameter Details
Model NO. NF309EM
Material Bearing Steel
Spherical Non-Aligning Bearings
Load Direction Radial Bearing
Separated Separated
Product Name Cylindrical Roller Bearing
Structure Cylindrical
Seals Type Open
Lubricate Oil Grease Dry
Precision Rating P0 P6 P5 P4 P2
Number of Row Single Row
Service OEM ODM
Transport Package Carton Pallet
Specification 45x100x25mm
Trademark SKF NSK NTN TIMKEN KOYO
Origin China
HS Code 8482500090

Application Industries

Industry Typical Equipment
Automotive Transmissions, Gearboxes, Axles
Motors Electric Motors, Generators
General Machinery Pumps, Fans, Compressors
Industrial Machinery Conveyors, Machine Tool Spindles

Stop Production Delays with Genuine Cylindrical Roller Bearing NF309EM 45x100x25mm

Production lines grinding to a halt due to bearing failures isn’t just inconvenient—it’s costly. Many manufacturers face the double risk of counterfeit bearings causing premature breakdowns and multi-tier distributors stretching delivery times by 30-50%. When your automotive machinery or industrial equipment needs a reliable 45x100x25mm bearing, these delays can derail production schedules and erode profitability.

Genuine NTN Cylindrical Roller Bearing NF309EM – In Stock and Traceable

As an official NTN distributor, we eliminate these pain points with direct access to authentic Cylindrical Roller Bearing NF309EM units. Our WMS real-time inventory system ensures your 45x100x25mm bearing is ready for immediate dispatch, while our ISO 9001 compliant three-level quality inspection guarantees batch consistency. Whether it’s for automotive transmissions or motor applications, we deliver bearings that match your exact specifications without the wait.

Engineered for High-Radial Load Applications

The Cylindrical Roller Bearing NF309EM is designed to excel in high-radial load environments typical of automotive machinery and industrial equipment. Its separated inner and outer rings allow for easy installation and maintenance, while the single-row cylindrical structure provides optimal load distribution. This makes it ideal for continuous operation in gearboxes, electric motors, and conveyors where reliability under constant stress is non-negotiable.

Technical Precision That Drives Performance

Every aspect of the NF309EM Bearing is engineered for performance. The bearing steel construction ensures durability under heavy loads, while precision ratings from P0 to P2 accommodate applications requiring tight tolerances. Its open seal design allows for flexible lubrication options—oil, grease, or dry operation—adapting to diverse working conditions. The 45x100x25mm dimensions balance compactness with load capacity, making it a versatile choice for space-constrained machinery.

Why Authenticity Matters for Your Bottom Line

Counterfeit bearings might seem like a cost-saving shortcut, but they often lead to hidden expenses: unexpected downtime, increased maintenance costs, and potential damage to adjacent components. Our NTN Cylindrical Roller Bearings come with full traceability documentation, eliminating customs clearance issues and quality disputes. By investing in genuine parts, you reduce the risk of premature failures and ensure longer equipment lifespan—ultimately lowering your total cost of ownership.

Why Global Manufacturers Trust Our Supply Chain

Our 10+ years of technical expertise and service across 50+ countries make us a reliable partner for automotive OEMs and machinery manufacturers. We provide: official NTN authorization with complete product traceability; dedicated inventory reservation for long-term supply agreements; real-time order tracking from warehouse to delivery; and on-demand technical support for installation and failure analysis. Our door-to-door logistics network ensures your 45x100x25mm Cylindrical Roller Bearing arrives when and where you need it.

Packaging & Shipping

  • Original manufacturer packaging with product specifications and traceability documentation
  • Carton and pallet packaging for secure transportation of bulk orders
  • 3-7 business day dispatch for in-stock items
  • Global delivery options including DHL, FedEx, UPS, air freight, and sea freight
  • Real-time logistics tracking provided for all shipments
  • Flexible order quantities with no minimum purchase requirement

Get Your NF309EM Bearing Shipped Today

Don’t let bearing procurement slow down your production. Send us your order details—including quantity and application requirements—and our team will issue a formal quotation within 24 hours. With our ready inventory and global logistics, you can minimize downtime and keep your operations running smoothly.

Frequently Asked Questions

Q: Are these genuine NTN bearings?

A: Yes, we are an official NTN authorized distributor. Every Cylindrical Roller Bearing NF309EM comes with complete traceability documentation to verify authenticity.

Q: How do I confirm if this bearing fits my equipment?

A: Provide your equipment model or working condition parameters, and our technical team will verify compatibility with the 45x100x25mm NF309EM specification.

Q: What is your warranty policy?

A: We adhere to NTN’s original manufacturer warranty standards, covering manufacturing defects with unconditional replacement or refund.

Q: What is the minimum order quantity?

A: We accept orders starting from 1 unit, supporting both emergency maintenance and bulk OEM requirements.

Q: How long does shipping take to my country?

A: In-stock items ship within 3-7 business days. Delivery time depends on your location, with express options available for urgent needs.

Q: How can I verify the bearing’s authenticity upon receipt?

A: Each bearing includes NTN’s original packaging with security features. We also provide traceability certificates and brand authorization documents for verification.

Ready to order or need a quote?
Send your bearing designation, application details, and quantity — we’ll respond within 24 hours.

SECTION 12 / GET QUOTATION

Ready to Order
NTN-252?

Submit your inquiry below. Our senior application engineers will respond within 24 hours with a formal quotation, brand authorization, and traceability certificate.

  • Formal quotation in 24h
  • Sample within 5-7 days
  • 100% genuine guarantee
  • Worldwide DDP shipping
FORM · INQUIRY-NTN-25 SECURE SSL

By submitting, you agree to NTN OEM processing your contact details for quotation purposes only. We never share information with third parties.

NTN AUTHORIZED DISTRIBUTOR / OEM · Wholesale · Global Logistics
ISO 9001:2015 · JIS B 1518