Leave A Message
If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.
Submit
63 Series
Home Deep Groove Ball Bearings 63 Series

6305 Open Deep Groove Ball Bearing For High-Speed Transmissions | 25×62×17 mm

6305 Open Deep Groove Ball Bearing For High-Speed Transmissions | 25×62×17 mm

The 6305 is an unsealed, single-row deep groove ball bearing engineered specifically for enclosed industrial environments where maximum rotational speed and minimal friction are the top priorities. Featuring a completely open architecture without seals or shields, this bearing allows for the free flow of external lubricants directly into the rolling elements. With a 25 mm bore diameter, a 62 mm outside diameter, and a 17 mm width, it falls under the medium-duty ISO 6300 series, offering a thicker cross-section and significantly higher load-bearing capabilities than standard light-duty alternatives.

6305 Deep Groove Ball Bearing 25×62×17 mm | ISO 6300 Series – Medium Duty | Open / Unsealed

Constructed from premium SAE 52100 chrome steel, the unhindered design of the 6305 eliminates the drag and thermal buildup typically caused by rubbing contact seals. This allows the internal balls to spin freely at exceptional velocities, reaching up to 13,000 r/min when integrated into oil-lubricated machinery. Capable of supporting heavy radial loads alongside moderate axial forces in both directions, it is the ideal component for sealed gearboxes, precision machine tools, and enclosed electric motors where external contamination is already managed by the machine's primary housing.

6305 Open Deep Groove Ball Bearing For High-Speed Transmissions | 25×62×17 mm

Comprehensive Applications

Because it relies on the machinery's internal environment for lubrication and protection, the open 6305 is heavily utilized in enclosed, high-performance mechanical systems:

Heavy Machinery & Stationary Equipment
  • Mining and aggregate crusher internal drives
  • Enclosed agricultural gearbox assemblies
  • Printing press and paper mill cylinder mounts
Industrial Gearboxes & Drives
  • Oil-bath speed reducers and heavy transmissions
  • Precision machine tool spindles
  • High-RPM industrial automation drives
  • Enclosed power transmission shafts
Enclosed Electric Motors & Generators
  • High-efficiency industrial electric motors
  • Wind turbine internal generator components
  • Large-scale commercial ventilation motors
Pumps & Compressors
  • Sealed centrifugal pumping systems
  • Industrial air and gas compressors
  • Fluid handling equipment with internal oil circulation

Key Performance Features

01. Unrestricted High-Velocity Performance

By completely omitting side closures (shields or seals), the 6305 generates the lowest possible rotational friction. This unsealed architecture directly translates to lower operating temperatures, reduced energy consumption, and the ability to safely achieve maximum RPMs in demanding industrial cycles.

02. Superior Lubricant Circulation

The open-face design allows the bearing to be continuously submerged in oil baths or subjected to direct oil-mist lubrication systems. This ensures rapid heat dissipation and constant flushing of the raceways, radically extending the bearing's lifespan in heavy-duty machinery.

03. Medium-Duty Structural Integrity

Despite its low-friction profile, the 6305 is highly robust. Utilizing the 6300 series' enlarged rolling elements and expanded raceway thickness, it provides exceptional resistance to shock loads and metal fatigue compared to standard 6000 or 6200 series bearings.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 63 Series – Medium Duty
Basic Designation 6305
Suffix Open (No Seals / No Shields)
Bore Diameter (d) 25 mm
Outer Diameter (D) 62 mm
Width (B) 17 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Pressed Steel
Dynamic Load Rating (Cʳ) 22.5 kN
Static Load Rating (C₀ʳ) 11.6 kN
Limiting Speed (Grease) 9,500 – 11,000 r/min
Limiting Speed (Oil) 11,000 – 13,000 r/min
Weight (approx.) 0.232 kg

Interchange Part Numbers

As a globally standardized metric component, this bearing is a direct drop-in replacement for the following manufacturer codes:

  • SKF: 6305
  • NSK: 6305
  • FAG6305
  • NTN: 6305
  • KOYO: 6305
  • NMB: 6305

Design & Configuration

The open 6305 is deliberately designed for internal machinery mounting where external dust and moisture are not a threat. It is typically supplied with a rust-preventative coating requiring appropriate lubrication upon installation. Standard inventory features normal internal clearance (C0), ensuring stable operation under typical thermal conditions. For applications involving extreme rotational speeds causing high internal heat or when installed with heavy interference fits, C3 radial internal clearance versions are recommended. If your equipment operates without an outer protective housing, consider the shielded (6305-ZZ) or sealed (6305-2RS) counterparts instead.

"Engineered for pure speed and strength, the open 6305 maximizes rotational efficiency and lubrication flow in securely enclosed industrial gearboxes and high-performance motors."

Related Products

Robust 70x150x35 mm 6314 2RS Bearing compatible with SKF 6314-2RS1 and NSK 6314 DDU for Industrial Gearboxes and Agricultural Tractors
6314-2RS Heavy-Duty Deep Groove Ball Bearing | Double Rubber Sealed Protection | 70×150×35 mm

The 6314-2RS is a robust, heavy-series metric deep groove ball bearing built specifically to endure demanding industrial environments and high-load applications. Equipped with heavy-duty dual contact rubber seals (2RS), this model provides superior defense against moisture, dirt, and heavy particulate contamination. Measuring 70 mm in the bore, 150 mm in outer diameter, and 35 mm in width, the 6314-2RS is an indispensable mechanical component for large-scale electric motors, heavy automotive transmissions, and rugged agricultural machinery requiring maintenance-free reliability.

Details
High Load Capacity 50x110x27 mm 6310 2RS Bearing - GCr15 Chrome Steel ABEC-1 Grade for Agricultural Machinery and Automotive Transmissions
6310-2RS Heavy-Duty Deep Groove Ball Bearing | Premium Dual Rubber Seal | 50×110×27 mm Metric Series

The 6310-2RS is a robust, medium-series deep groove ball bearing specifically engineered to accommodate substantial radial and axial loads in demanding industrial environments. Unlike miniature or thin-wall models, this heavy-duty bearing features thick cross-sections and large rolling elements, making it an absolute powerhouse for rigorous applications. Outfitted with dual contact rubber seals (2RS), it forms an impenetrable barrier against harsh contaminants, water ingress, and abrasive dust. With standardized metric dimensions—a 50 mm bore, 110 mm outer diameter, and 27 mm width—the 6310-2RS delivers unyielding structural integrity for heavy machinery, automotive transmissions, and large-scale industrial motors.

Details
6309-2RS Medium Heavy Ball Bearing highlighting Double Rubber Lip Contact Seals for Dustproof Protection and Pre-Packed Lifelong Grease
6309-2RS Medium-Heavy Deep Groove Ball Bearing | Dual-Lip Rubber Seal Protection | 45×100×25 mm

The 6309-2RS is a high-end, mid-sized heavy metric deep groove ball bearing engineered to deliver balanced load capacities and exceptional structural rigidity in harsh working conditions. Fitted with dual-lip synthetic rubber contact seals (2RS), this bearing offers an impermeable barrier against airborne grit, moisture, and fine particulates. Featuring a 45 mm bore, 100 mm outer diameter, and 25 mm width, the 6309-2RS represents the ideal mechanical solution for medium-to-large rotating machinery, industrial pumping systems, and heavy-duty electric power drives requiring long-term, maintenance-free operation.

Details
6308-2RS Deep Groove Ball Bearing displaying dual NBR rubber seals for optimal water and dust resistance
6308-2RS Deep Groove Ball Bearing | Heavy-Duty Double Rubber Sealed Performance | 40×90×23 mm

The 6308-2RS is a robust, single-row deep groove ball bearing engineered to deliver superior load-carrying capacity and extended service life in demanding environments. Equipped with tight-fitting, dual contact rubber seals (2RS), this model provides an impenetrable barrier against moisture, heavy dust, and external contaminants while securely retaining its factory-filled lubrication. Built to exact metric dimensions—a 40 mm bore, 90 mm outer diameter, and 23 mm width—the 6308-2RS is the definitive mechanical solution for medium-to-heavy industrial machinery, automotive hubs, and high-torque electric motors.

Details
6306-2RS Deep Groove Ball Bearing showing Dual Rubber Seals for Moisture Protection and Reliable Grease Retention
6306-2RS Deep Groove Ball Bearing | Heavy-Duty Rubber Sealed Performance | 30×72×19 mm

The 6306-2RS is a robust, high-precision single-row deep groove ball bearing engineered for exceptional endurance in medium-to-heavy mechanical setups. Unlike metal-shielded models, this bearing is equipped with synthetic rubber seals (2RS) on both sides, which are securely bonded to the outer ring to form a reliable contact seal against the inner ring. This design offers superior defense against water splashes, moisture, and fine dust particles while effectively retaining the internal factory grease. Featuring standard metric dimensions—a 30 mm bore, 72 mm outer diameter, and 19 mm width—the 6306-2RS serves as a highly dependable component for electric motors, agricultural equipment, and heavy industrial machinery.

Details
6302-ZZ Deep Groove Ball Bearing showing Dual Pressed Steel Shields for Dust Protection and Low Friction Torque
6302-ZZ Metric Shielded Ball Bearing | High-Velocity Metal Shield Protection | 15×42×13 mm

The 6302-ZZ stands as a highly versatile, dual-metal-shielded single-row radial ball bearing engineered to deliver exceptional performance under elevated operational speeds and steady radial loads. To minimize drag, this model incorporates twin non-contact pressed steel shields (ZZ) that form a precise barrier over the internal mechanics, retaining factory-applied grease and deflecting dust without creating mechanical friction. Featuring standardized metric dimensions—a 15 mm bore, 42 mm outer diameter, and 13 mm width—the 6302-ZZ provides a highly dependable mechanical solution for power tools, electric motors, and automotive sub-assemblies.

Details
Premium 6303 2RS Replacement Bearing compatible with SKF 6303-2RSH and NSK 6303 DDU for electric motors
6303-2RS Deep Groove Ball Bearing | Premium Double Rubber Seal Protection | 17×47×14 mm

The 6303-2RS represents a highly versatile, single-row radial bearing crafted for exceptional durability and uncompromising contaminant resistance. Outfitted with twin synthetic rubber seals (2RS) that make physical contact with the inner ring, this model securely locks in the factory-applied lubricant while creating a formidable barrier against water, dirt, and industrial grime. Manufactured to standard metric measurements—featuring a 17 mm bore, 47 mm outer diameter, and 14 mm width—the 6303-2RS is an indispensable component for power transmission systems, high-speed power tools, and automotive auxiliaries where reliability is paramount.

Details
Welink 6301-2Z Deep Groove Ball Bearing with 12mm x 37mm x 12mm Dimensions featuring Premium High Stability Grease Fill
6301-ZZ Metric Shielded Ball Bearing | Enhanced Rotational Agility Metal Shield Performance | 12×37×12 mm

The 6301-ZZ stands out as a highly reliable, dual-metal-shielded single-row radial ball bearing engineered to deliver smooth rotational agility under high-frequency conditions and steady radial forces. To minimize power loss, this model incorporates twin non-contact pressed steel shields (ZZ) that form a precise gap over the internal elements, successfully locking in factory-applied grease and deflecting micro-particulates without introducing frictional resistance. Featuring standard metric dimensions—a 12 mm bore, 37 mm outer diameter, and 12 mm width—the 6301-ZZ provides a perfect mechanical solution for compact power tools, small electric motors, and modern appliance hardware.

Details

Leave A Message

Leave A Message
If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.
Submit

Home

Products

whatsApp

contact