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68 Series
Home Deep Groove Ball Bearings 68 Series

6809-ZZ Thin-Section Deep Groove Ball Bearing For Industrial Automation & Robotics | 45×58×7 mm

6809-ZZ Thin-Section Deep Groove Ball Bearing For Industrial Automation & Robotics | 45×58×7 mm

The 6809-ZZ is a single-row, thin-section deep groove ball bearing from the 6800 series, fitted with non-contact pressed steel shields on both faces. Featuring a 45 mm bore and a highly compact 58 mm outer diameter, it occupies one of the slimmest profiles available for large-shaft metric ball bearings. This unique geometry—combining a large internal diameter with a minimal 7 mm cross-section—makes the 6809-ZZ the definitive choice for space-constrained assemblies where weight reduction and low-friction rotation are paramount. The double steel shields retain the factory grease fill while preventing the ingress of large particulate matter, ensuring extended service life without the thermal drag associated with rubber seals.

6809-ZZ Deep Groove Ball Bearing 45×58×7 mm | 68 Series | Double Metal Shields (ZZ)

A shielded thin-section bearing engineered for compact precision machinery that demands large shaft accommodation without the bulk of standard bearings. The 6809-ZZ utilizes two non-contact steel shields on a 45 mm bore, an arrangement that physically deflects dust and debris away from the raceway while holding the pre-packed lubrication securely in place. It covers the identical 45 × 58 × 7 mm footprint as the sealed 6809-2RS and the open 6809, allowing it to seamlessly fit into housings designed for these variants. By utilizing metal shields rather than contact rubber seals, the 6809-ZZ sacrifices heavy moisture resistance to unlock significantly higher rotational speeds and minimal frictional torque—a necessary trade-off for clean to moderately dusty environments where operational efficiency is critical.

6809-ZZ Thin-Section Deep Groove Ball Bearing For Industrial Automation & Robotics | 45×58×7 mm

Comprehensive Applications

The 6809-ZZ is selected whenever a 45 mm shaft requires reliable support within an ultra-thin outer envelope:

Industrial Automation & Robotics
  • Robotic arm joints and articulation mechanisms
  • Automated Guided Vehicle (AGV) drive systems
  • Precision rotary indexing tables
  • Hollow-shaft encoders
Power Transmission & Motors
  • High-speed electric motor shafts
  • Compact gearbox assemblies
  • Conveyor system drive rollers
Aerospace & Precision Instruments
  • Lightweight gimbal and camera mount pivots
  • Optical tracking mechanism supports
  • Aerospace actuator feedback systems
Specialty Vehicles & Mobility
  • High-performance electric bicycle (e-bike) bottom brackets
  • Performance suspension linkage points
  • Wheelchair hub mechanisms

Key Performance Features

01. Low-Friction Steel Shields for High-Speed Operation

The pressed steel shields (ZZ) provide a vital physical barrier against solid contaminants without making physical contact with the inner ring. This non-contact design equates to practically zero seal drag, allowing the 6809-ZZ to achieve rotational speeds up to 11,000 RPM (grease) while minimizing heat generation. For applications like electric motors and high-speed robotics, this translates to maximum power transmission efficiency and cooler running temperatures.

02. Ultra-Thin Profile for Weight and Space Reduction

As a 6800-series thin-section bearing, the 6809-ZZ provides an exceptional bore-to-OD ratio (45mm to 58mm). This allows engineers to use larger, stiffer shafts without drastically increasing the size and weight of the surrounding housing. It is a critical advantage for weight-sensitive applications in aerospace, drones, and portable industrial equipment where every gram dictates performance.

03. Factory Pre-Lubricated for Maintenance-Free Longevity

Packed at the manufacturing stage with premium lithium-based grease, the 6809-ZZ arrives ready for immediate installation. The dual metal shields effectively trap the lubricant within the rolling elements, eliminating the need for complex relubrication systems in the machine design. This maintenance-free configuration reduces downtime and ensures consistent operation throughout the bearing's lifecycle.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 6800 Series
Basic Designation 6809
Suffix Double Metal Shields (ZZ)
Bore Diameter (d) 45 mm
Outer Diameter (D) 58 mm
Width (B) 7 mm
Material (Races & Balls) High-Carbon Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard (P0) / P6 & P5 Options Available
Cage Design Pressed Steel Ribbon Style
Dynamic Load Rating (Cʳ) 6.40 kN
Static Load Rating (C₀ʳ) 5.60 kN
Limiting Speed (Grease) ~11,000 r/min
Limiting Speed (Oil) N/A — permanently sealed
Weight (approx.) 0.040 kg

Interchange Part Numbers

The 6809-ZZ is cross-referenced under several suffix conventions across major global manufacturers:

  • SKF: 61809-2Z
  • NSK: 6809ZZ
  • FAG (Schaeffler): 6809-2Z
  • NTN: 6809ZZ
  • KOYO: 6809ZZ
  • NACHI: 6809ZZE
  • Generic: 6809-ZZ, 6809Z, 61809-ZZ

Design & Configuration

The 6809-ZZ is a Conrad-type single-row radial ball bearing tailored for thin-section applications. Its internal geometry and ball complement are specifically optimized for the narrow 7 mm cross-section, yielding a highly capable 6.40 kN dynamic load rating and 5.60 kN static load rating. The non-contact metal shields introduce practically no friction, empowering the bearing to safely reach grease-lubricated speeds of up to 11,000 r/min. For machinery running in heavily contaminated or wet environments, the sealed 6809-2RS would be the necessary substitute. However, in clean to moderately dusty settings—where minimal rotational resistance and compact housing footprints are the primary design drivers—the 6809-ZZ is the technically superior choice. High-precision grades up to ABEC 5 (P5) are available for applications demanding strict runout tolerances and quiet operation.

"When the shaft is large (45 mm), the housing footprint is strictly limited, and high-speed, low-friction operation is non-negotiable, the 6809-ZZ thin-section bearing delivers the optimal balance. Its dual metal shields, pre-lubricated raceways, and ultra-slim profile make it a high-efficiency component for robotics, electric motors, and precision automation where standard bearings simply will not fit."

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Details

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