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

6304-ZZ Double Shielded Deep Groove Ball Bearing For High-Velocity Industrial Use | 20×52×15 mm

6304-ZZ Double Shielded Deep Groove Ball Bearing For High-Velocity Industrial Use | 20×52×15 mm

The 6304-ZZ is a heavy-wearing, medium-duty Deep Groove Ball Bearing constructed with twin stamped steel closures (ZZ). Engineered to strike the perfect balance between high-speed rotational capability and robust load support, this bearing is an essential component for continuous-running machinery. Measuring 20 mm for the inner bore, 52 mm across the outer diameter, and featuring a 15 mm width, it belongs to the ISO 6300 series. This classification means it features larger internal rolling elements and a thicker raceway cross-section than standard light-duty alternatives, granting it exceptional resilience under substantial radial and moderate axial stresses.

6304-ZZ Deep Groove Ball Bearing 20×52×15 mm | ISO 6300 Series – Medium Duty | Twin Metal Shielded

Forged from premium SAE 52100 (GCr15) exact-tolerance chrome steel, the 6304-ZZ is built to withstand rigorous industrial operational cycles. The defining asset of the "ZZ" designation is its non-contact metallic shields. Unlike rubber seals that grip the inner ring and create drag, these steel shields hover fractions of a millimeter above the inner race. This frictionless defense effectively repels dry particulates, sawdust, and metallic shavings while allowing the bearing to achieve exceptional rotational velocities (up to 13,000 r/min) with minimal thermal expansion. Pre-filled with high-grade industrial grease, it delivers a maintenance-free, drop-in solution for dry and dusty environments.

6304-ZZ Double Shielded Deep Groove Ball Bearing For High-Velocity Industrial Use | 20×52×15 mm

Comprehensive Applications

Thanks to its combination of high RPM limits, dust protection, and medium-duty load ratings, the 6304-ZZ is widely deployed across diverse mechanical sectors:

Electric Motors & Power Generation
  • Industrial electric motor armatures
  • High-RPM industrial cooling fans and blowers
  • Commercial power tool drive shafts
  • Wind turbine auxiliary generators
Material Handling & Manufacturing
  • Heavy-duty conveyor belt drive rollers
  • Automated packaging machinery linkages
  • CNC machine tool auxiliary mechanisms
  • Textile spinning and weaving equipment
Automotive & Mobile Equipment
  • Heavy-duty vehicle alternators and starter mechanisms
  • Transmission support shafts
  • Commercial lawn and turf care equipment wheels
Pumps & Compressors (Dry Zones)
  • Industrial air compressor drives
  • Centrifugal fan housings
  • Fluid processing pumps (external dry components)

Key Performance Features

01. Frictionless Dust Exclusion

The dual steel shields (ZZ) provide a highly effective physical barricade against ambient factory dust and airborne debris. Because the shields do not physically rub against the rotating inner ring, the bearing operates with practically zero friction-induced drag, conserving energy and keeping operational temperatures remarkably low.

02. Medium-Duty Structural Superiority

As part of the 6300 dimension series, the 6304 offers a significantly higher dynamic load capacity (approx. 15.9 kN) compared to 6004 or 6204 standard counterparts. This thicker architecture dramatically reduces the risk of metal fatigue in applications subjected to sudden shocks or heavy continuous loads.

03. Pre-Lubricated for Lifecycle Longevity

Factory-packed with a calculated volume of high-quality, temperature-resistant lithium grease, this bearing requires absolutely no external lubrication or maintenance after installation, sharply decreasing machinery downtime and long-term service costs.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 63 Series – Medium Duty
Basic Designation 6304
Suffix ZZ / 2Z (Double Stamped Steel Shields)
Bore Diameter (d) 20 mm
Outer Diameter (D) 52 mm
Width (B) 15 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / ABEC-1 / P5 Grade Available
Cage Material Pressed Steel Assembly
Dynamic Load Rating (Cʳ) 15.9 kN
Static Load Rating (C₀ʳ) 7.88 kN
Limiting Speed (Grease) 11,000 – 13,000 r/min
Limiting Speed (Oil) --
Weight (approx.) 0.144 kg

Interchange Part Numbers

Manufactured to strict international metric sizing standards, the 6304-ZZ ensures seamless interchangeability with leading top-tier brands:

  • SKF: 6304-2Z
  • NSK: 6304ZZ
  • FAG6304-2Z
  • NTN: 6304ZZ
  • KOYO: 6304ZZ
  • Timken: 6304-2Z

Design & Configuration

The 6304-ZZ is precisely tailored for mechanisms operating at high speeds in environments filled with dry contaminants. Most standard stock features a normal internal radial clearance (C0). For specialized machines expected to generate intense internal thermal expansion, or installations utilizing extreme press-fits, bearings configured with C3 internal clearance are readily available. Please note: while the steel shields are exceptional at blocking solid particulate, they are not completely waterproof. If your machinery is regularly exposed to water spray, fluid washdowns, or thick mud, upgrading to the rubber-sealed alternative (6304-2RS) is highly recommended.

"Combining the high-speed efficiency of non-contact shielding with the brute strength of a medium-duty architecture, the 6304-ZZ ensures smooth, uninterrupted power transmission in aggressive industrial environments."

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