1 Complete Model & Code Explanation

Model：WBB1-8706-2RS1

Code Definition

WBB：Stainless steel thin-section bearing series, lightweight thin-wall design for compact mounting

1：Sub-class code of series

8706：Specification code defining bearing bore, outer diameter and width

2RS1：Double-side contact rubber seal, sealing lip fits inner ring for reliable sealing performance

Structure：Enclosed thin-wall structure with built-in contact rubber seals on both ends

Supply form：Single independent bearing, no factory duplex grinding, DB/DF duplex arrangement not supported

Important reminder: WBB1-8706-2RS1 is stainless steel thin-section miniature bearing. Compared with standard deep groove ball bearings, it features thinner wall, lighter weight and smaller footprint, yet lower radial load capacity, only suitable for light-load applications. 2RS1 contact rubber seal offers better protection against dust and mist than steel shields. Continuous contact between seal lip and inner ring creates friction torque, limiting maximum speed below equivalent 2Z shielded versions. Rubber seals are non-detachable; solvent cleaning and on-site re-lubrication are prohibited. Avoid prolonged exposure to strong solvents and sustained high temperature to prevent rubber aging and swelling failure.

Basic Parameters

Bore d：6 mm

Outer diameter D：14 mm

Width B：4 mm

Bearing type：Single-row thin-section deep groove ball bearing

Number of rows：Single row

Bore form：Straight cylindrical bore

Seal arrangement：2RS1, double-side contact rubber seal

Cage：Stamped stainless steel cage

Material：Stainless steel

Surface coating：Uncoated

Pre-installed lubricant：General long-service grease

Relubrication capability：On-site re-greasing unavailable

Radial internal clearance：Normal clearance class

Duplex arrangement：Not supported, single unit operation only

Basic dynamic load rating：0.065 kN

Basic static load rating：0.024 kN

Reference speed：52 000 r/min

Limiting speed：36 000 r/min

Net weight：0.00018 kg

Indicative carbon footprint：0.00051 kg CO₂e

eClass code：23-05-08-01

UNSPSC code：31171504

Series Suffix Comparison

WBB1-8706：Open type stainless steel thin-section bearing, no seal

WBB1-8706-2Z：Stainless steel double steel shield, higher speed, basic protection

WBB1-8706-2RS1：Stainless steel double 2RS1 contact rubber seal (this model)

WBB1-8706-2RS1/VT378：Stainless steel 2RS1 seal, pre-filled VT378 food-contact grease

2 Structure & Operating Characteristics

Japan NMT WBB1-8706-2RS1 is developed on WBB stainless steel thin-section platform with lightweight thin-wall structure and double-side 2RS1 contact rubber seals, designed for space-limited, light-load, humid and dusty working conditions. Stainless steel matrix effectively resists condensed moisture and fresh water mist to reduce rust risk. Contact sealing lip fits inner ring side to form a barrier blocking dust, mist and intermittent water splash entering the bearing.

Restricted by thin-wall construction, bearing rigidity and load capacity are lower than standard deep groove ball bearings of identical bore. Continuous impact load and heavy load are forbidden. Friction from sealing lip increases rotating torque and reduces limiting speed, making it unsuitable for long-term ultra-high-speed continuous operation. Matched with standard radial clearance for assembly under normal temperature. Sustained high temperature accelerates rubber seal aging and grease failure. Stamped stainless steel cage delivers corrosion resistance for miniature rotary components intermittently exposed to moisture. The bearing mainly bears radial loads and withstands minor bidirectional axial loads. Long-term overspeed operation is prohibited.

3 Core Performance Advantages

1. WBB stainless steel thin-wall lightweight structure with compact outline, saving internal installation space and ideal for miniature precision modules.

2. Double-side 2RS1 contact rubber seals provide reliable protection against dust, mist and intermittent water splash, superior to 2Z steel shields.

3. Stainless steel material provides inherent basic rust resistance, adapting to humid environments with condensation.

4. Symmetrical sealing layout on both ends without assembly orientation limitation, compatible with automatic assembly lines.

5. Pre-filled long-life grease from factory with enclosed sealing structure, supporting maintenance-free operation under standard conditions.

6. Miniature compact dimension widely applicable to portable equipment, optical gimbals, lightweight medical devices.

4 Typical Application Fields

4.1 Optical & Precision Instruments

Rotary shafts for compact camera gimbals, rotary mechanisms of portable inspection equipment, optical fine-tuning modules.

4.2 Micro Automation Equipment

Guide rollers for miniature linear modules, idlers of micro sorting mechanisms, transmission assemblies for small 3C automation.

4.3 Light-Duty Medical Devices

Rotary joints of portable diagnostic equipment, micro rotary shafts for small fluid conveying devices.

4.4 Small Devices in Humid Environment

Transmission parts of compact humidifiers, micro test tooling for laboratories, light auxiliary rollers for small food equipment.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Maintain clean and dry assembly area to prevent hard particles entering the bearing. Press force shall only act on ring end faces. Knocking or squeezing rubber seals is strictly forbidden to avoid lip damage. Thin-wall outer ring has low rigidity; excessive clamping force during assembly must be prevented to avoid outer ring deformation. Stainless steel has relatively low hardness; avoid surface impact which creates corrosion initiation points. Symmetrical seal structure requires no specific installation direction.

5.2 Selection Guidance

Space limited, dry environment, high speed priority, only coarse dust blocking → WBB1-8706-2Z

Compact installation, humid & dusty, with mist and intermittent splash, enhanced sealing required → WBB1-8706-2RS1 (this model)

Humid condition plus food contact sanitary requirements → WBB1-8706-2RS1/VT378

Continuous heavy load and heavy impact → Adopt standard wall thickness bearing steel bearing solution

5.3 Lubrication Instruction

Pre-filled with general long-service grease at factory for maintenance-free operation under standard conditions. 2RS1 rubber seal forms enclosed inner cavity. Forcible seal dismantling, solvent immersion cleaning and arbitrary addition of other grease grades are strictly prohibited. Long-term high temperature and continuous liquid immersion accelerate grease deterioration and rubber hardening & cracking, drastically shortening service life.

5.4 Environmental Application Notes

2RS1 contact seal can resist water mist and intermittent mild splash, incapable of enduring prolonged liquid immersion or high-pressure water flushing. Stainless steel offers basic rust resistance but is not fully rust-proof; pitting corrosion occurs under long-term exposure to salt water or strong corrosive media. Prevent rubber seals from contacting aromatic solvents and strong acid/alkaline cleaners to avoid swelling and hardening seal failure.

6 Daily Maintenance & Fault Troubleshooting

Conduct low-speed running-in after assembly, confirm no abnormal noise and temperature rise before gradually raising to rated speed. Common faults: increased rotation resistance, abnormal operating noise, grease leakage from seals, rust spots on outer ring.

Typical failure causes: moisture penetration caused by worn sealing lip; rubber aging and grease deterioration under persistent high temperature; thin outer ring deformation from excessive assembly clamping force; continuous operation exceeding limiting speed. Once seal rupture, rolling element rust or bearing jamming appears, repair is impossible and replacement is recommended.