What Are Our Concerns About Bearings（5）

Q1:What is the meaning of 7321 rolling bearings?

A： 7: indicates double row angular contact ball bearings  

3: width series code  

21: Inner diameter size code, indicating that the inner diameter is 21*5=105mm  

If it is an old model, it is 30221 when converted to a new model  

3: indicates tapered roller bearing  

02: Width series code  

21: Inner diameter size code, indicating that the inner diameter is 21*5=105mm  

Q2:What does it mean to add K after bearing type? What does k stand for?

A:If a new model is followed by a K, it has the following meanings:  

1. Add K after the new type of self-aligning ball bearing, indicating the tapered bearing with a taper of 1:12.  

2. Add K after the new type of self-aligning roller bearing, which also represents the tapered bearing with a taper of 1:12.  Such as 22320CAK, tdel is 153620  

he old mo3. Add K after the old type of self-aligning roller bearing, indicating that the bearing has oil groove and oil hole.  For example, the old model is 53620K and the new model is 22320CA/W33.  

Q3:What is the meaning of 6115 rolling bearings?

A:The second position of deep groove ball bearing is size series code;  The last two are 75 inside diameters.  

Q4:Rolling bearing 6313/P5 bearing type, tolerance class, inner diameter size, size series, clearance what is meant?  

A:  Bearing type: deep groove ball bearing  

Basic size: d=60mm;  D=140mm;  B=33mm  

Installation size: da=77mm;  Da=128mm  

P5 represents the bearing tolerance grade P5, and the radial clearance is 0 group

Q5:What is the model meaning of bearing 6309M/C4VL0241, such as what is the meaning of M after 6309,C4VL0241?

A:This is the SKF bearing  

M is for copper retainer  

C4 is clearance  

Vl0241 means the bearing is insulated  

Q6:INA bearing code, what is the meaning of code and installation requirements?

A:This is the model of outer spherical bearing with seat  

GE70-KRR-B is an outer spherical bearing with an inner diameter of 70mm  

GG ASE 14 is the model of the bearing seat  

Q7:What is the bearing size of 60310?

A:Inner diameter: 50mm Outer diameter: 110mm Thickness: 27mm

Q8:After knowing the bearing model, how to query the size of the bearing inner ring and outer ring?  

A:Bearing manual or machine parts manual, with detailed tables for various bearing sizes.  For example, the outer diameter and inner diameter thickness of 6203 are respectively 40,17,12mm .

Q9:How to query 158020 bearing model?

A:The new code name is 6204-2Z.  Deep groove ball bearings with dust-cover on both sides.  Inner diameter 20mm, outer diameter 47mm, thickness 14mm.  

Q10:How to query the size of 221 bearing?

A:Aligning ball bearing  

New model: RN228M  

Old model: 502228H  

Inside diameter: 140  

Outer diameter: 221  

Width: 42

Q11:How can inquire the parameters and models of bearings?

A:Select suitable bearings according to design requirements.  Bearings are divided into many types, to determine what type of bearings to choose, what are the use conditions of bearings and so on.

Q12:What is NU1018 bearing parameters between the shaft positioning size ?       

A:NU10818 Old model 31118 size 90*140*24mm

Q13:The nominal diameter of the ball screw is 16mm. What kind of support bearings are used at both ends ? 

A:The nominal diameter of ball screw is 16mm, generally the diameter of the fixed end bearing will be processed into 12mm, and the diameter of the supporting end will be processed into 10mm, so the corresponding bearings are respectively 7001A and 6000ZZ, 7 series of angular contact bearings, 6 series of deep groove ball bearings.  

Ball screw is an ideal product for converting rotary motion into linear motion or linear motion into rotary motion.  

Ball screw is a driving element commonly used in tool machinery and precision machinery. Its main function is to convert rotary motion into linear motion, or to convert torque into axial repeated force. It has the characteristics of high precision, reversibility and high efficiency.  Ball screws are widely used in various industrial equipment and precision instruments because of their small friction resistance.  

Ball screw is composed of screw, nut, steel ball, preloaded sheet, reverse device and dustproof device.  Its function is to transform rotating motion into linear motion, which is the further extension and development of Eckom screw. The significance of this development is to change the bearing from sliding motion to rolling motionQ14:What are the model sizes of mark 206 rear wheel bearings?

Q14:What are the model sizes of mark 206 rear wheel bearings?

A:Symbol 206 is the omission of 6206:  

6- Deep groove ball bearing;  

2– Width series code (refer to the standard bearing model table to determine);  

06– Inside diameter series code: inside diameter=06X5=30mm.

Q15:What kind of bearing is inner diameter 50 outer diameter 110 width 22?

A:The model is deep groove ball bearing 6310  Or tapered roller bearing 30310  

Q16:What is the tolerance size of inner hole of 6212 bearing?

A:Model: 6212  

Type: deep groove ball bearing  

Accuracy: P0  

Nominal inside diameter: 60 mm  

The upper deviation is 0, and the lower deviation is -15μm.  

Q17:Why is there no 81204 bearings in daqo bearings query?

A:Due to the limitation of manufacturing conditions, or other reasons, the small inner diameter of thrust cylindrical roller bearings can only be 40, that is, there will be 81208, but there are no bearings with small inner diameter of 81204, 81205, 81206 and equal ratio 40.  

Q18:How to use the bearing model to query bearings?

A:For example, 6005 bearing.”6″ refers to the deep groove ball bearing, a “0” refers to the thickness of 12.”05″ refers to his inner diameter of 25, is also 05 times.  

Q19:The inner diameter is 4 cm. The outer diameter is 6.7 cm.  What’s its model?  

A:Thrust ball bearing 51320X3, Other unknown types CL40-1BF,

Other unknown type TK40-1B, Thrust ball bearing 51708ZH/YA1,

Thrust ball bearing 51708ZH/YA, Other unknown types 51708ZH/P6

Q20:What are the other dimensions of bearings with outer diameter 15?

A:Such as deep groove ball bearings, needle roller bearings, cylindrical roller bearings, tapered roller bearings and so on, second.  Bearing inner diameter is not the same, in addition, bearing width is not the same.  For details, please refer to volume 3 of the machinery manual .