What Are Our Concerns About Bearings（51）

Q1:Deep groove ball bearings, what is the size tolerance of inner diameter and outer diameter?

A:Both the inner and outer diameter tolerances are less than the basic dimensions, usually with grade 5 or 6 tolerances

Q2:What are the parameters of 53BIC247 deep groove ball bearings?

A:Bearing type: 53BIC247  
Inner diameter (d) : 136.525  
The outside diameter (D) : 190.5  
Width (C) : 25.4  
Quality (Kg) : 2.6  
Brand: TIMKEN  
Category: deep groove ball bearings  

Q3:What is the model of double row deep groove ball bearing with inner diameter 95, outer diameter 170 and thickness 43?  

A:The bearing shall be a self-aligning ball bearing (cylindrical bore), model 2219, with a mass of approximately 4.2 kg

Q4:What are the parameters of deep groove ball 6000 bearing?

A:New model 6000, old model 80100, type deep groove ball bearing, inner diameter 10, outer diameter 26, thickness 8, weight KG, box number/box market price 4.6RMB  

Q5:What are the characteristics of FAG deep groove ball bearings?

A:SKF Explorer Explorer series bearings, this series of bearings than any brand on the market at present better performance, longer life, in the design, use of outstanding performance,  SKF EXPLORER bearing can be identified by the outer ring side of the bearing engraved with the word “EXPLORER” and the “EXPLORER” logo on the packaging box, but the product number remains unchanged.  

Q6:The specific parameters of deep groove ball bearings have the sizes of D, D and B, do you need other sizes?  

A:For the use of bearings, sizes D, D, B or C are sufficient.  It can also be found on the sample: chamfering size, chamfering radian, internal clearance, dimensional accuracy, rotation accuracy, static and static load, ultimate speed, bearing material (specific to the steel label), and even the grease label used.  

If it is to design and develop bearings, such as: outer diameter of the inner ring, inner diameter of the outer ring, raceway depth, raceway radian, the distance between the seal cover and the ring, the size of the ball, need to go to the bearing factory technology department or some laboratories to find the answer!  These data are not available in the sample.  

Q7:What is the model specification table of centripetal ball bearing？

A:1. Bearing type representation: Code (fourth digit from right)

• 0: deep groove ball bearing  
• 1: self-aligning ball bearing  
• 2: cylindrical roller bearings  
• 3: self-aligning roller bearing  
• 4: needle roller bearings  
• 5: spiral roller bearings  
• 6: Angular contact ball bearing  
• 7: tapered roller bearings  
• 8: thrust ball bearing thrust angular contact ball bearing  
• 9: thrust cylindrical roller bearing thrust self-aligning roller bearing thrust needle roller bearing thrust tapered roller bearing  

2.  Bearing dimension representation  

Diameter series, code (third digit from right)  
Ultra light: 7 cases: 1000700  
Ultra light: 8 and 9 cases: 7000800 7000900  
Extra light: 1 7 cases: 7000100 7002700  
Light: 2 cases: 3056200  
Chinese: 3 cases: 300  
Weight: 4 cases: 2086400  
Width series, code (seventh digit from right)  
Narrow: 7 cases: 7000800  
Normal: 1 case: 1000700  
Width: 2 cases: 2007900  
Extra-wide: 3 cases: 3000700  
Example: 4774900  
 
Height series, code (seventh digit from right)  
Extremely low: 7 cases: 7589900  
Low: 9 cases: 9008900  
Normal: 1 example: 1008900  

3. bearing inner diameter representation  

Bearing standard inner diameter: 10  
01 Inner diameter: 12  
02 INSIDE diameter: 15  
03 Inner diameter: 17  
Number *5= Inner diameter Example: 205: Inner diameter 25, 206, 30  
Bearing code is read as:  
Lead code: Bearing clearance, bearing tolerance class  
Code number right number:  
7: Width series  
6.  5: Bearing structure form  
Type 4:  
3: Diameter series  
2,1: bearing inner diameter  
Example: 3G3053220, that is, radial clearance according to the third group, class G tolerance, tolerance grade according to the letters B, C, D, E, G, in order from high to low tolerance grade.  Class G is generally omitted in the bearing code  
Only imported bearing precode indicates the brand, 6203,6 means thrust angular contact ball bearing, 2 means light series, 03 means bearing inner diameter, 03 inner diameter is 17  
6305,6 means thrust angular contact ball bearing, 3 means medium series, 05 means inner diameter, 5 times 5, inner diameter is 25  

Q8:Is model 60/72 deep groove ball bearing made in China?

A:Size 72×110×20 of this specification

Q9:Import deep groove ball bearing 61810 bearing model parameters?  Inside diameter?  Outer diameter?  The thickness?  

A:61810 bearing: inner diameter 50mm outer diameter 60mm thickness 7mm  
SKF61810 bearing: same as above SKF brand code  

Q10:Deep groove ball bearing outer diameter 110mm inner diameter 60mm thick 22mm what is it model?

A：Brand new model Old model inner diameter (mm) outer diameter (mm) thickness (mm) type  
FAG bearing 6212 212 60 110 22 deep groove ball bearings
FAG bearing 6212.2RSR 180212 60 110 22 Deep groove ball bearing  
FAG bearing 6212.2ZR 80212 60 110 22 deep groove ball bearing  
FAG bearing 6212N 50212 60 110 22 Deep groove ball bearings  
FAG bearing 6212RSR 160212 60 110 22 Deep groove ball bearing  
FAG bearing 6212ZR 60212 60 110 22 deep groove ball bearing  
FAG bearing 6212ZRN 150212 60 110 22 deep groove ball bearing  

Q11:What is the inner diameter and outer diameter of the 6002 bearing?

A:6002 Bearing dimensions  
Model No. : 6002 [1]  
Series: deep groove ball bearings  
Brand: FAG  
Inside diameter: 15 mm  
Outer diameter: 32 mm  
Thickness: 9 mm  

Q12:What is KOYO deep groove ball bearing imported deep groove ball bearing surface strengthening treatment technology?

A:Under certain special operating conditions, KOYO deep groove ball bearings can obtain longer life than traditionally calculated, especially under light loads.  These special operating conditions are when the rolling surface (rails and rolling parts) is effectively separated by a lubricating film to limit the surface damage that may be caused by contaminants.  In fact, under ideal conditions, so-called permanent KOYO bearing life is possible.  

Life of a KOYO deep groove ball bearing is defined in revolutions (or hours of operation at a given speed) : Within this life of a KOYO deep groove ball bearing, initial fatigue damage (spalling or defect) should occur on any of its bearing rings or rolling bodies.  

However, whether in laboratory tests or in actual use, it can be obviously seen that the actual life of bearings with the same appearance under the same working conditions is very different.  In addition, there are several different definitions of deep groove ball bearing “life”, one of which is the so-called “working life”, which means that the actual life of a bearing can be achieved before damage is caused by wear, damage is usually not caused by fatigue, but by wear, corrosion, sealing damage and other reasons.