55mm Bore 6811ZZ Thin Section Bearings for Optical Rotary Encoders
| Item No : | |
| Size (d*D*B) : | 55x72x9mm |
| Material : | Chrome Steel GCr15 |
| Lead Time : | 3-5 days |
| Weight : | 0.08KG |
| MOQ : | 50 pcs |
| Service : | Support Sample Testing |
⚙️Product Description:
The 6811 series (55x72x9mm) is an extra-light thin-section deep groove ball bearing engineered for weight-critical and space-constrained precision mechanisms. Featuring a substantial 55mm inner bore with a remarkably slim 72mm outer diameter and 9mm width, it accommodates large hollow shafts, wiring harnesses, or optical light paths without adding bulk. Available with dual steel dust shields (6811ZZ) or contact rubber seals (6811-2RS) pre-filled with long-life synthetic grease, we supply these space-saving thin-section bearings under our RMO brand while facilitating flexible multi-brand OEM procurement for global robotics and industrial automation builders.
⚙️Product Features:
- Large 55mm Bore with Extra-Thin Profile: Enables seamless hollow-shaft design for electrical cabling or fluid lines within a narrow 9mm envelope width.
- Low Rotational Torque: Precision micro-ground GCr15 raceways and optimized ball complement ensure extremely low frictional resistance during continuous positioning.
- Significant Weight Reduction: Compact cross-section minimizes structural weight, reducing inertia in high-speed pick-and-place dynamic systems.
- Shielded & Sealed Versatility: Select 6811ZZ metal shields for minimal friction at elevated RPMs or 6811-2RS rubber seals for particulate contaminant protection.
⚙️Product Application:
Engineered for hollow-shaft integration, minimal torque, and compact positioning, the 6811 bearing is widely specified in:
- Robotics & automation: collaborative robot (Cobot) joint gearboxes, hollow wrist drives, and automated end-effectors.
- Precision optical & sensing: optical rotary encoders, radar antenna turntables, and camera gimbal stabilizers.
- Semiconductor & medical: wafer handling robot arms, medical diagnostic rotators, and cleanroom positioning stages.
- Industrial machinery: textile indexing cylinders, lightweight gearbox input shafts, and automated packaging drives.
⚙️Precautions:
| 1. Keep clean | 2. Use with caution | 3. appropriate tool | 4. Hot-loading | 5. Be careful of rust |
| Dust will have a bad effect on the bearing, so keep the surrounding clean. | Strong impact during use can easily cause scratches and indentations. | Avoid replacing existing tools, and use appropriate tools. | Bearings are precision parts, so hot installation is recommended. | Sweat on your hands during operation will cause rust, so it is best to wear gloves. |
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⚙️Obtain Certificate:
About Rimao
Since its establishment in 2011, Rimao Bearing has combined international vision with local wisdom and injected innovative ideas into every bearing and pulley with its profound industry accumulation and unremitting pursuit of technology. We have not only passed CE and ROHS certification, but also set a new benchmark in the industry and led the development trend of the bearing industry.
We are not just a ball bearing and roller bearing importer and wholesaler. We provide real solutions to help you achieve the product and design goals set by your customers. With more than 20 years of production and sales experience, tens of thousands of models and specifications, we look forward to cooperating with you!
⚙️Technical Parameters:
| Model No. | 6811ZZ (Metal Shield) / 6811-2RS (Rubber Seal) |
| Dimensions | 55x72x9mm (Inner d x Outer D x Total Width/Height H) |
| Bearing Type | 6800 Series Extra-Light Thin-Section Bearing |
| Material | Chrome Steel GCr15 |
| Internal Clearance | |
| Precision Rating | |
| Load Type | Radial Loads + Moderate Axial Thrust |
| Target Application | Robotic Joints, Encoders, Hollow Shaft Drives |
| Working Temperature | -20°C to +120°C |
| Brand | RMO (Own Brand) / Neutral / OEM Custom / Other Global Brands |
| Package | Individual plastic bag, plastic tube or original RMO brand box |
| Lead Time | 3-5 days for stock; 7-15 days for bulk orders |
| Shipping | Express (DHL/FedEx/UPS), Air Freight, Sea Freight |
| Payment | 100% T/T, or 30% T/T In Advance, 70% T/T After Finished Production |
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