What Are Our Concerns About Bearings（10）

Q1:Tapered roller bearing model 30214, what does the number mean?

A:3 is the beginning of the new conical roller code  

0 is the bearing width  

214 is the bearing inner diameter size  

Q2:What type of bearing is 61205？

A:61205 is the deep groove ball bearing 6205, its size is 25mm inner diameter, 52mm outer diameter, 15mm height .Q3:What is the model of rolling bearing with inner diameter 25 and outer diameter 52?

Q3:What is the model of rolling bearing with inner diameter 25 and outer diameter 52?

A:The height is 15 is 6205 bearings.  There are many of the same size.  Such as 7205C 7205AC N205 NU205 NJ205 1205 51205  

Q4:6534909 what is the new bearing model?

A:6534909: Needle roller bearing with inner ring, solid ring.  

6: indicates the width.  6 Column widths.  

5: indicates an inner ring.  6 indicates that there is no inner ring.  For example, 6634909 is a bearing without inner ring.  

4: Type structure code.  Old code: basic code from right to left the fourth number 4 indicates that the bearing is needle roller bearing.  

9: outer diameter code.  9 series external diameter.  

09: Inner diameter code.  Represents the inner diameter size of the bearing =09×5=45mm  

New code name: NA6909.  

Q5:What does the bearing model number stand for? Such as model 22125 rolling bearings?

A:2 Bearing type  

21 is the size series  

25 Inner diameter size code is 125mm  

Q6:Inner diameter 17mm outer diameter 35mm thick 14mm what type of bearing is it?

A:SKF 63003-2RS1 bearing dimension parameters  

Model: 63003-2RS1 Bearing Series: Deep groove ball bearings, bearing Inner Diameter: 17, Outer Diameter: 35,Thickness: 14,Limit speed: 13,000 r/min. Dynamic load: 6050N, Static load: 3250N,Note: SKF single row deep groove ball bearings 

Q7:How to distinguish the type of bearing?

A:Determination of bearing type:  

• First, according to the text information determine the bearing.  

First look at the text on the bearing, from the text can determine the bearing model.  

Actual measurement and observation

Step: determine the bearing structure code (type code).  

Count one from left to right or add one and the second number together  

“6” means deep groove ball bearing  

“4” means double row deep groove ball bearings  

“2” or “1” indicates self-aligning ball bearing (4 numbers in basic model)  

“21”, “22”, “23” and “24” denote self-aligning roller bearings.  

“N” denotes cylindrical roller bearing (including short cylindrical roller and part of slender needle roller)  

The inner ring of “NU” has no flange.  

“NJ” inner ring single guard edge.  

“NF” outer ring single fender.  

The outer ring of “N” has no fender.  

“NN” double row cylindrical roller, outer ring without retaining edge.  

“NNU” double row cylindrical roller, inner ring without flange.  

The length of the roller is 5 times less than the diameter size, called needle roller bearings  

“NA” rotary needle roller bearing with outer ring  

“NK” stamped housing needle roller bearings  

“K” needle roller and cage assembly, no inner and outer ring.  

“7” means angular contact ball bearing  

“3” means tapered roller bearing

“51”, “52” and “53” indicate centripetal thrust ball bearings (five numbers for basic models)  

“81” means thrust short cylindrical roller bearing  

“29” means thrust self-aligning roller bearing  

• The second step: determine the inner diameter of the bearing.  

Directly measure the inner diameter of the bearing with calipers, both ends of the hole should be measured, because one end of the inner hole of the taper hole bearing is large and the other is small.  Measurements are indicated in millimeters (mm).  

Step 3: Measure other dimensions of bearings, marked with millimeters (mm).  

Width, outside diameter, etc.  

Step 4: Check the manual  

Example: NSK 23140 camke4s11  

Assume that the text on the bearing has been missing.  

Step, see the bearing is double row spherical roller, can be aligning, that is to determine: bearing model basic model is 5 numbers, from left to right a number must be 2, according to: “21” “22” “23” “24” means aligning roller bearing.  

The second step, measured bearing diameter is 200mm, the other end of the hole aperture is slightly larger than 200mm (actual = twelfth of the width, multiplied by 2, plus 200mm).  It can be determined that the inner diameter of the bearing is 40, and there is a post code K indicating the taper hole.  

The outer diameter of the measuring bearing is 340mm and the width is 112mm.

Third step, find the “self-aligning roller bearing” in the bearing manual, find the inner diameter (d) is 200mm, in combination with the outer diameter size (D) 340mm, width size (B) 112mm.  It can be determined that the basic code of the bearing is 23140.  

The taper of the inner hole indicates that there is a letter K in the rear code, and the cage is copper in the rear code with M (generally together with CA). The oil hole in the outer ring indicates that there is E4 in the rear code. Ask the user the temperature of the bearing working environment to determine whether there is a high temperature anti-deformation code of S11 ring.  

The explanation of the postcode can also be found in the bearing manual.  

Q8:What type of ball bearing can bear 1000 kg, bearing diameter can not be large, about 50mm?

A:Deep groove ball bearings (GB/T276-1994)  

Basic size/mm | d: 50  

Basic size/mm | D: 130  

Basic size/mm | B: 31  

Installation size/mm | da (min) : 62  

Installation size/mm | Da (Max) : 118  

Installation size/mm | ra (Max) : 2.1  

Other sizes/mm | d2 material: 77.3  

Other sizes/mm | D2 material: 107.8  

Other sizes/mm | r (min) : 2.1  

The basic load rating/kN | Cr: 92.2  

The basic load rating/kN | Cr0: 55.2  

Limit speed (r/min) | fat: 5300  

Limit speed (r/min) | oil: 6300  

Weight/kg | W material: 1.855  

Bearing type code | 60000:6410  

If the speed is not high, a pair of tapered roller bearings can be used.

Single row tapered roller bearings (GB/T 297-1994)  

Bearing type code | 30000:32310  

Basic size/mm | d: 50  

Basic size/mm | D: 110  

Basic size/mm | T: 42.25  

The basic size/mm | B: 40  

Basic size/mm | C: 33  

Installation size/mm | da (min) : 60  

Installation size/mm | db (Max) : 61  

Installation size/mm | Da (min) : 90  

Installation size/mm | Da (Max) : 100  

Installation size/mm | Db (min) : 102  

Installation size/mm | a1 (min) : 5  

Installation size/mm | a2 (min) : 9.5  

Installation size/mm | ra (Max) : 2  

Installation size/mm | rb (Max) : 2  

Other sizes/mm | a material: 28.2  

Other sizes/mm | r (min) : 2.5  

Other sizes/mm | r1 (min) : 2  

Calculating coefficient of | e: 0.35  

Calculating coefficient of | Y: 1.7  

Calculating coefficient of | Y0:1  

The basic load rating/kN | Cr: 178  

The basic load rating/kN | Cr0: 235  

Limit speed (r/min) | fat: 3800  

Limit speed (r/min) | oil: 4800  

Weight/kg | W material: 1.89  

Q9:What is needle bearing RNSFU547626W11, the size is 54.76.26?

A：According to the model name, RN has no inner ring;  S is the outer ring with oil groove and 3 lubricating oil holes;  FU is the type of holding equipment material; W11 is grease or temperature environment.