• Sourcing Solutions
  • Services & Membership
  • Help & Community
We offer premium service for Trade Assurance orders.

Quick Details

  • Structure: Deep Groove
  • Type: Ball
  • Brand Name: FreeRun
  • Bore Size: 30 mm
  • Outside Diameter: 42 mm
  • Model Number: 6806-2RS/C
  • Precision Rating: ABEC-1,ABEC-3,ABEC-5
  • Seals Type: 2RS (rubber seals on both sides)
  • Number of Row: Single Row
  • Place of Origin: Fujian, China (Mainland)
  • Bearing: 6806-2RS/C ceramic bearing
  • Diameter: 30x42x7mm
  • Cage/Retainer type: Crown retainer
  • Balls: SI3N4 Ceramic balls
  • Retainer material: Stainless Steel
  • Quality-standard of balls: G10 as DIN 5401, ISO 3 290
  • Hardness of balls and rings: 59-65 HRC
  • Lubrication: Oil,Grease,Dry
  • Vibration Level Codes: V4,V3,V2,V1
  • Internation Clearance Codes: C0,C2,C3,C4,C5

Packaging & Delivery

Packaging Details 10 pcs in plastic tube,10 tubes in one paper box.
Delivery Time Shipped in 5 days after payment

SI3N4 Hybrid ceramic bearing 30x42x7m 6806-2RS/C ceramic bearing

FreeRun is a specialized manufacturer of Hybrid Ceramic Bearing. Full Complement ceramicbearings,Ceramic Balls.

 

1. Freerun

Miniature Bearing Description                                                                                    

 

Hybrid Ceramic Bearing:

Ceramic bearings offer a significant performance improvement from those made from traditional steel. Our ceramic bearings are manufactured from silicon nitride (Si3N4), an exceptionally hard non-metallic material rated for speeds to 2 million dN, offering a wide selection of benefits.

Hybrid Bearings have steel rings and ceramic balls. Si3N4 Ball is the most popular for the balls as it has only 40 percent of the density of bearing steel but is much harder giving greater wear resistance. Zirconia is heavier with 75 percent of the density of steel so is less suitable for hybrid bearings.. 

Full Ceramic Bearing :

Full Ceramic Bearings are made entirely of ceramic material and are superior to common steel bearings in many ways. Ceramic is the perfect material for any application seeking to achieve higher RPM’s, reduce overall weight or for extremely harsh environments where high temperatures and corrosive substances are present. Applications such as cryopumps, medical devices, semiconductors, machine tools, turbine flow meters, food processing equipment, robotics and optics. Ceramic materials commonly used for bearings are Silicon Nitride (Si3N4), Zirconia Oxide (ZrO2), or Silicon Carbide (SiC.)

Ceramic Balls:

We are special in making Silicone Nitride Balls (Si3N4 Balls,Zicronia Balls (ZrO2 Balls),Sic Ceramic Balls , Aluminum Oxside Valve (AI203) ceramic balls.

Compared with steel, ceramic materials are noted for their better or particular characters, such as wear-resistance, corrosion resistance, high temperature resistance, electrical insulation (except SiC), non-magnetic, high strength, high rigidity, and low specific gravity. These properties qualify them for replacing steel to make bearings serve in conditions of higher speed, harsh environment and less lube, and decrease wear, noise, vibration and maintenance time of bearings, and eventually increase performance, reliability and life of bearings.

  

Miniature Bearings can be Category by Configuration as follows:

The same size can be made of different materials, including,
Stainless Steel Bearings 

Chrome Steel Bearings   

Carbon Steel Bearings   

 

.

 

 

Packaging & Shipping
Package10 pcs in a plastic tube,10 tubes in a box(Or depends on you)
Shipping1. Express (TNT, EMS, DHL, UPS, FedEx, SF Express etc)
2. Chinese Regular Mail/ Post Mail  
3. By Sea. 
PaymentT/T, PayPal, Western Union

 

 

 

Grease                                                                                                                                                                                                             

Oils – maintain their consistency well over a wide temperature range and are easy to apply. For very low torque applications, a light instrument oil should be specified. Higher running speeds are possible with oil but the obvious drawback with oil is the fact that it tends not to stay in place.

For anything other than very low speeds, continuous lubrication through oil mist, oil jet or oil bath is normally necessary. An exception to this is the use of a retainer (cage) that can be impregnated with oil such as the phenolic retainer. Perfluorinated oils can offer improved performance at slightly higher speeds as they don't migrate (run out) as easily.
Greases – are simply oils mixed with a thickener to so that they stay inside the bearing. Greases are generally more suitable for heavy loads and have the obvious advantage of giving constant lubrication over a long period without maintenance.

 

 

Main Market                                                                                                                                                                                            

 

  

 

8.Freerun

The Advantage Of Products                                                                                      

1.High precision bearings,P4 ,P5 and P6.
2.Rings are made of refined Chrome steel.stainless steel 440C
3.Cage:Peek & PTFE cage .(can assure constant working under 250 centigrade)and peek cage also is the ideal cage for the high speed as it can provide the lubrication during  bearing working, and it has the property of self-lubrications.However for normal applications, steel cage and Nylon cage is enough.
4. Balls: we use G3,G5 high precision Si3N4 ball for the high speed.
5. Radial clearance: Normal C0,or C3.
6.Not only for the high speed, but also Hybrid bearings has the
insulation functions. Hence for the small size of bore dia.40mm ,
also can be used for the insulation bearing purpose.
7.Full ball hybrid also can be produce as per our production picture.
All-ceramic bearings have good to excellent corrosion resistance, are non-magnetic and, apart from silicon carbide, are electrically insulating. All-ceramic bearings can be used in high to very high temperatures if supplied without a cage (full complement).

Electrical resistance: Si3N4 best, then ZrO2, then SIC which is conductive.High temp resistance:

SiC best (1100C), then Si3N4 (1000C), then ZrO2 (400C) Corrosion resistance:

SIC (excellent), then Si3N4 (very good) and ZrO2 (good)Load capacity:

SIC highest then Si3N4, then ZrO2 Fracture toughness:

ZrO2 best, then Si3N4, then SiC

All-ceramic bearings have lower load and speed ratings than steel or hybrid bearings. The speeds are lower due to the lower precision and roundness of the rings and the loads are lower because the material is more brittle. Under heavy loads and particularly heavy shock loads, there is a risk of cracking. For the same reason, great care should be taken with interference fits. Zirconia is the least brittle so it will handle shock loads and very small interference fits better than the other ceramic materials with silicon carbide being the most brittle. Shock loads should be avoided with all-ceramic bearings. Great care should be taken when using ceramic bearings (especially silicon nitride and silicon carbide) on steel shafts at high temperature due to the difference in expansion coefficient and the relative brittleness of ceramics.

 

 

Bearing Application

Bearing Pictures

  

 

Transaction History of the Supplier

Below is the information about the supplier's transactions conducted via Alibaba.com. If you require further details regarding the transaction data, please contact the supplier directly.

Transaction Overview

Transactions

Transaction Details

This supplier has completedtransactions with buyers from .

Shipping Destination
Transaction Value
Transaction Date
Email to this supplier
Trade Assurance
China (Mainland) | Manufacturer
Transaction Level:
Supplier Assessments:
21 Transactions 60,000+
The supplier’s transactions conduted via Alibaba.com in the past 6 months.
The supplier supports Trade Assurance – A free service that protects your orders from payment to delivery.
Supplier's Trade Assurance Limit: US $106,000
Learn More