1. Product Introduction

The 6206-ZZ is a single-row deep groove ball bearing built to ISO boundary dimensions of 30×62×16mm and closed on both sides with pressed steel shields. Rings and balls are machined from high-carbon GCr15 chrome bearing steel, through-hardened and dimensionally stabilised, then superfinished on the raceways so the ball path stays smooth under continuous rotation. The non-contact ZZ shields form a narrow labyrinth that keeps workshop dust, fibres and splash out of the raceway while holding the factory grease charge inside, so the bearing runs lubrication-free for its whole service interval. Because the 30mm bore, 62mm outside diameter and 16mm width envelope is a genuine international standard, the 6206-ZZ drops straight into existing housings and replaces equivalent 6206-Z parts without modification. Its balanced combination of load rating, quiet running and dirt resistance makes it the standard choice for medium-duty rotating assemblies such as escalator handrail drive units, where the bearing has to work quietly in public environments and stay reliable through years of uninterrupted passenger traffic.

2. Product Features

• Sealed against everyday contamination: Two pressed steel shields create a tight non-contact gap on each side, blocking dust, lint and machining debris while retaining the sealed-in grease charge.
• Quiet running at working speed: Raceway and ball geometry are ground to P6 tolerance and matched with Z3V3 noise-graded balls, keeping vibration and acoustic output low even when the bearing turns continuously.
• Carries radial and axial load together: The deep, uninterrupted groove lets one bearing absorb radial force plus axial force in either direction, simplifying housing design and reducing part count.
• Low friction, low heat: Shield contact is eliminated by design and the grease charge is sized for long intervals, so friction torque and temperature rise stay modest at high shaft speeds.
• Dimensionally interchangeable: The 30×62×16mm envelope follows ISO 9001, allowing direct replacement of 6206-2Z and 6206-ZZ bearings from other suppliers.
• Stable steel quality: GCr15 rings are hardened to HRC 60-64 and tempered for dimensional stability, giving consistent hardness, roundness and fatigue life from lot to lot.

3. Product Advantages

Buying the 6206-ZZ directly from the production line removes the markup and the waiting time of a trading channel. Every lot is checked for bore and outside diameter tolerance, radial runout, clearance, hardness and noise level before packing, so bearings from different batches assemble and run the same way. Precision class, clearance, grease type and shield material can all be specified for OEM projects, and packaging can be neutral or branded to suit the destination market. Combined with bulk stock, short lead time and flexible MOQ, the 6206-ZZ gives maintenance teams and machine builders a predictable, repeatable bearing supply instead of a one-off purchase.

• Factory-direct pricing with OEM and ODM support for custom marking, greasing and packaging
• Full dimensional and noise inspection reported per batch on request
• Stable stock position for repeat orders and urgent spares
• Samples available for fit and noise validation before volume purchase

4. Product Technical Parameters

5. Application Scenarios

The 6206-ZZ is specified mainly for escalator handrail drive units. In this assembly the bearing sits on the drive and tensioning shafts behind the handrail, where it carries the belt pull, keeps the roller aligned and has to stay quiet through long daily duty cycles in shopping centres, airports and metro stations. The shielded, pre-greased design suits the lightly dusty, vibration-loaded environment inside the balustrade and keeps maintenance access to a minimum. The same load and speed range also makes it a sound choice for moving walkway drive rollers, ventilation fan shafts, light conveyor pulleys, pump and gear motor drives, and general industrial transmission assemblies.

Dimensions, clearance, grease fill and shield type can be adapted to the drive unit you are building or servicing. Send us your drawing or the original part number and our engineering team will confirm the matching 6206-ZZ specification, samples and delivery schedule.

6. Company file

Ningbo Kent bearing company was established in 2003 and is one of the leading bearing manufacturers and exporters in China. Kent specializes in the design and production of high precision, high speed and low noise  groove ball bearings and pillow block bearings. At present, the Corporation has more than 1,000 employees, a fixed assets of 2 billion yuan, and produces 250 million sets of bearings annually. The Corporation's products are widely used in more than 50 countries and regions under 2 independent brands, namely "BUGAO" and "NBKT".

Since 2003, the Corporation has set up a Research & Development Center equipped with multiple laboratories used for precision measurement, mechanical testing, lifespan testing, and physicochemical testing, to continuously upgrade its skills and raise its manufacturing standard and product's precision. Our workshops are installed with a series of advanced numerically-controlled, grinding and assembly equipment that utilize centralized filtration and cooling systems. Together with the production equipment suppliers, we developed these grinding, ultra-precision, fully automated integrated production lines, and own the intellectual property rights. The precision level of the products are at P5 level and above, with noise level reaching Z4, V4 and above. Some of our projects have exceeded the 30% precision reserves. Our products are widely used in electric motors, automobiles, motorcycles, household appliances, textile, electric tools and water pump equipment industries, both locally and globally.

The company has more than 20 assembly lines, and through ISO9001:2015 quality management system certification, has a professional technical and service team, technical personnel proportion of more than 30%. Over the years, we have been adhering to the use of high-end raw material production, from the first to every step, with excellent product development capabilities and strict quality control, we continue to expand the product line and application range.