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✅ ISO 9001:2015 Certified · 100% Genuine NTN · Full Traceability
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Marine Equipment 6305 Deep Groove Ball Bearing 25x62x17mm NTN Rustproof OEM Supply thumbnail 1
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Marine Equipment 6305 Deep Groove Ball Bearing 25x62x17mm NTN Rustproof OEM Supply - Detail thumbnail 3
Marine Equipment 6305 Deep Groove Ball Bearing 25x62x17mm NTN Rustproof OEM Supply - Dimension thumbnail 4
NTN GENUINE
IN STOCK
Marine Equipment 6305 Deep Groove Ball Bearing 25x62x17mm NTN Rustproof OEM Supply
Marine Equipment 6305 Deep Groove Ball Bearing 25x62x17mm NTN Rustproof OEM Supply - Side View
Marine Equipment 6305 Deep Groove Ball Bearing 25x62x17mm NTN Rustproof OEM Supply - Detail
Marine Equipment 6305 Deep Groove Ball Bearing 25x62x17mm NTN Rustproof OEM Supply - Dimension
Model
6305
Origin
JAPAN
Lead Time
5-7 DAYS
NTN AUTHORIZED · OEM SUPPLIER

Marine Equipment 6305 Deep Groove Ball Bearing 25x62x17mm NTN Rustproof OEM Supply

MODEL: 6305 100% Genuine · Traceable

Ensure reliable marine equipment performance with the NTN 6305 marine bearing, engineered to eliminate rust-related downtime in harsh saltwater environments. This 25x62x17mm deep groove ball bearing features precision-machined bearing steel construction and specialized rustproof treatment, delivering consistent rotation even in high-moisture conditions.OEM-grade quality with full traceability documentation for seamless customs clearance and complianceGrease or oil lubrication flexibility to match specific marine application requirementsDirect from authorized NTN distributor – no middlemen delays, ensuring production schedules stay on track

Key Specifications
SPEC-01
Bore (d)
25mm
OD (D)
62mm
Width (B)
17mm
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)25 mm
Outer Diameter (D)62 mm
Width (B)17 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 TypeDeep Groove Ball 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 reliable marine equipment performance with the NTN 6305 marine bearing, engineered to eliminate rust-related downtime in harsh saltwater environments. This 25x62x17mm deep groove ball bearing features precision-machined bearing steel construction and specialized rustproof treatment, delivering consistent rotation even in high-moisture conditions.

  • OEM-grade quality with full traceability documentation for seamless customs clearance and compliance
  • Grease or oil lubrication flexibility to match specific marine application requirements
  • Direct from authorized NTN distributor – no middlemen delays, ensuring production schedules stay on track

Description

Product Specifications

Parameter Details
Model NO. 6305
Material Bearing Steel
Specification 25×62×17mm
Trademark NTN
Origin Japan
HS Code 8482300000
Production Capacity 1000000 units/year
Lubrication Grease or Oil
Customerized Customizable
Sample Available
Service OEM ODM

Application Industries

Industry Typical Equipment
Marine Deck machinery, winches, pumps, steering systems
Automotive Transmissions, water pumps, alternators
General Machinery Electric motors, fans, gearboxes, conveyors

Marine Equipment Failures Start with Compromised Bearings — Get NTN 6305 Rustproof Solutions

Marine maintenance teams know the nightmare: saltwater corrosion turning bearings into seized liabilities within months. Counterfeit deep groove ball bearings often lack proper rustproofing, leading to unexpected equipment downtime during critical operations. When your 25x62x17mm bearing fails, replacing it means costly dry dock stays and missed delivery deadlines.

NTN 6305 Marine Bearing: Rustproof Performance You Can Trace

Our NTN 6305 deep groove ball bearing delivers the rust resistance marine environments demand. As an official NTN distributor, we ensure every 25x62x17mm bearing comes with full traceability documentation, eliminating customs clearance delays. With our WMS real-time inventory system, your marine equipment doesn’t wait—we stock this critical size for immediate dispatch to shipyards and vessel operators worldwide.

Engineered for the Harsh Marine Environment

This NTN 6305 marine bearing thrives where land-based bearings fail. The 25mm bore, 62mm outer diameter, and 17mm width balance load capacity with compact design, ideal for space-constrained marine pumps and winches. Its bearing steel construction, paired with specialized rustproof treatments, withstands salt spray and temperature fluctuations from -20°C to 120°C, ensuring reliable performance in both freshwater and offshore applications.

Technical Details That Prevent Marine Equipment Failures

The 6305 bearing’s 25x62x17mm dimensions aren’t arbitrary—they balance dynamic load capacity with rotational efficiency. Marine gearboxes require precise clearance control, which NTN’s manufacturing tolerances deliver consistently. The grease lubrication option minimizes maintenance intervals, while oil lubrication supports high-speed applications like propulsion system fans. Our three-level quality inspection checks every bearing for dimensional accuracy, ensuring proper fit in marine equipment without excessive play or binding.

Why Genuine NTN Bearings Reduce Total Cost of Ownership

Choosing unauthorized 6305 bearings may save upfront costs, but the hidden expenses add up fast. A single counterfeit bearing failure in a marine winch can cause $15,000+ in downtime and repairs. Our NTN 6305 rustproof bearing, backed by ISO 9001 quality standards, lasts 3x longer in saltwater environments, cutting replacement frequency and labor costs. With complete traceability documents, you avoid customs holds and liability disputes that plague gray-market purchases.

10+ Years of Marine Bearing Expertise at Your Service

We’ve supplied NTN bearings to marine equipment manufacturers in 50+ countries, building a reputation for reliability. Our technical team includes marine engineering specialists who provide free model selection support—ensuring you get the right 25x62x17mm bearing for your specific application, whether it’s a fishing vessel’s hydraulic system or an offshore platform’s crane. As an authorized distributor, we offer OEM customization options, from special lubricants to custom packaging, tailored to marine industry requirements.

Packaging & Shipping

  • Seaworthy packaging: Individual cartons with moisture barriers, palletized for secure ocean transport
  • Dispatch within 24 hours for in-stock orders
  • Global door-to-door logistics via DHL, FedEx, or sea freight options
  • Real-time tracking provided from warehouse to delivery
  • Flexible order quantities: 1 unit for emergency repairs, bulk pricing for OEM production

Get Your NTN 6305 Bearing Shipped Today

Every day your marine equipment waits for a reliable bearing is a day of lost revenue. Send us your bearing model, application details, and quantity—our team will confirm compatibility and send a formal quote within 24 hours. With our rustproof NTN 6305 bearing, you’re not just buying a component; you’re securing your vessel’s operational reliability.

Frequently Asked Questions

Q: Are these genuine NTN bearings?

A: Yes, we are an official NTN authorized distributor. Every 6305 bearing comes with brand authorization certificates and full traceability documentation to verify authenticity.

Q: How do I confirm this 25x62x17mm bearing fits my marine equipment?

A: Provide your equipment model or operating parameters (load, speed, temperature), and our technical team will cross-verify compatibility with NTN’s official specifications.

Q: What is the warranty policy?

A: All NTN bearings are covered by the manufacturer’s warranty against manufacturing defects. We provide full after-sales support for warranty claims and replacement.

Q: What is the minimum order quantity?

A: We accept orders for 1 unit to support emergency repairs, with volume discounts available for bulk purchases.

Q: How long does shipping take to marine ports?

A: In-stock bearings ship within 24 hours. Express delivery takes 3-5 days; sea freight options are available for cost-sensitive bulk orders.

Q: How can I verify the rustproof treatment?

A: NTN’s rustproof process meets ISO 10289 standards. We provide material certification and can arrange third-party testing upon request for critical applications.

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
6305?

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-6305 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