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68 Series
Home Deep Groove Ball Bearings 68 Series

6812-ZZ Thin-Section Deep Groove Ball Bearing | Metal Shielded For Electric Mobility | 60×78×10 mm

6812-ZZ Thin-Section Deep Groove Ball Bearing | Metal Shielded For Electric Mobility | 60×78×10 mm

The 6812-ZZ is an ultra-thin section single-row radial ball bearing from the metric 6800 series, equipped with dual non-contact pressed steel shields. Featuring a generous 60 mm bore diameter paired with an exceptionally slim 78 mm outer diameter, this component offers an optimal solution for designs requiring substantial shaft support within a highly restricted radial envelope. The "ZZ" configuration utilizes precision-engineered metal plates that guard the internal rolling elements against larger dust particles and debris while safely retaining the factory grease charge, all without inducing the mechanical drag or frictional heat typical of contact rubber seals.

6812-ZZ Deep Groove Ball Bearing 60×78×10 mm | 68 Series Thin-Section | Double Non-Contact Metal Shield (ZZ / 2Z)

Engineered specifically for low-torque, weight-sensitive applications, the 6812-ZZ excels in environments where high rotational efficiency is critical and space is at a premium. It shares an identical 60 × 78 × 10 mm physical footprint with the open 6812 and the rubber-sealed 6812-2RS, ensuring effortless retrofitting into existing housings without requiring costly shaft modifications. By selecting the steel-shielded ZZ variant, mechanical engineers maximize the assembly's limiting speed headroom while maintaining a reliable barrier against clean-to-moderately dusty industrial surroundings.

6812-ZZ Thin-Section Deep Groove Ball Bearing | Metal Shielded For Electric Mobility | 60×78×10 mm

Comprehensive Applications

The 6812-ZZ thin-section bearing is widely deployed wherever a large-diameter 60 mm shaft demands low-friction, space-saving rotational support:

Robotics & Advanced Automation
  • Robotic arm joints
  • Multi-axis precision positioning tables
  • Automated guided vehicle (AGV) drive wheels.
Electric Mobility & Bicycles
  • High-end bicycle bottom brackets
  • E-bike mid-drive motors
  • Lightweight wheel hubs
Textile & Printing Machinery
  • High-speed spinning frames
  • Weaving loom rollers
  • Thin-walled cylindrical printing drums
Medical Diagnostic Equipment
  • Rotary tables for imaging scanners
  • Surgical support arms
  • Laboratory centrifuges

Key Performance Features

01. Frictionless Steel Shields for High-Velocity Efficiency

Unlike contact rubber designs, the dual metal shields of the 6812-ZZ do not press against the inner ring shoulder. This non-contact mechanism minimizes starting and running torque, preventing power loss and heat buildup. It allows the bearing to reach significantly higher RPM limits while successfully keeping the internal factory grease localized within the raceway for maintenance-free operation.

02. Ultra-Thin Profile for Maximum Space and Weight Savings

Belonging to the ISO 18 dimension series, the 6812-ZZ features an incredibly narrow cross-section (only a 9 mm difference between the inner and outer radius). This allows engineers to downsize the overall housing footprint and drastically reduce component weight, making it highly effective for drone manufacturing, aerospace sub-assemblies, and portable industrial tools.

03. Standardized Form Factor for Seamless Upgrades

The 6812-ZZ serves as a direct, drop-in replacement for any housing or shaft layout designed for standard 6812 dimensional specifications. If your current system utilizes open bearings but suffers from premature grease migration or dust ingress, switching to the 6812-ZZ introduces robust pre-lubricated protection with zero structural changes or extra machining required.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 6800 Series (Ultra-Thin Section)
Basic Designation 6812
Suffix Double Non-Contact Metal Shield (ZZ / 2Z)
Bore Diameter (d) 60 mm
Outer Diameter (D) 78 mm
Width (B) 10 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) 11.5 kN
Static Load Rating (C₀ʳ) 10.6 kN
Limiting Speed (Grease) ~9,500 r/min
Limiting Speed (Oil) N/A — permanently sealed
Weight (approx.) 0.110 kg

Interchange Part Numbers

The 6812-ZZ bearing is cross-referenced under various manufacturer-specific nomenclature codes:

  • SKF: 61812-2Z / 6812-2Z
  • NSK: 6812ZZ
  • FAG (Schaeffler): 61812-2Z / 6812-2Z
  • NTN: 6812ZZ / 6812Z
  • KOYO: 6812ZZ
  • NACHI: 6812ZZ
  • Alternative Equivalents: 61812ZZ, 6812Z, 1000812, MR6812-ZZ

Design & Configuration

The Welink Bearing 6812-ZZ is a precision Conrad-type deep groove ball bearing optimized for balanced radial and light axial loads. Despite its slim 10 mm width profile, the deep, highly polished raceway grooves allow it to deliver a substantial 11.5 kN dynamic load capacity. The non-contact metal shields ensure that the bearing operates at peak thermal efficiency near its 9,500 RPM threshold. For extreme environments involving direct water spray or fine abrasive dust, the contact-rubber variant (6812-2RS) should be considered; however, for low drag, high operating speeds, and restrictive radial spaces, the 6812-ZZ remains the mathematically and mechanically superior choice.

"When your application demands a substantial 60 mm shaft clearance but cannot tolerate the bulk or weight of a standard-series bearing, Welink's 6812-ZZ provides the ideal slim-line solution. Its dual metal shielding, lifetime grease lubrication, and standardized 6800-series footprint deliver high-speed, maintenance-free performance across advanced robotics, custom e-mobility hubs, and high-efficiency automated machinery."

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Details

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