What Are Our Concerns About Bearings（7）

Q1:I want to know how to know its diameter by bearing type  

Generally, you can know the nominal inner diameter of the bearing from the bearing type, but the outer diameter and width size will check the relevant information.  The relationship between the nominal inner diameter of the bearing and the code name is:  

• 1) Inner diameter 0.6 ~ 10 (non-integer), the code is directly expressed by the number of millimeters of nominal inner diameter, such as deep groove ball bearing 618/2.5, that is, D =2.5;  

• 2) There are special codes for inner diameter 10 ~ 17, and the codes for inner diameter 10, 12, 15 and 17 are 00, 01, 02 and 03 respectively.  If 6201, that is, d=12;  

• 3) Inner diameter 20-480 is the quotient of inner diameter divided by 5. If the quotient is less than two digits, “0” should be added, such as 08.  For example, 23208, its D =40;  

• 4) The inner diameter is greater than or equal to 500 and 22, 28, 32, directly expressed by the inner diameter mm, separated from the size series by “/”, similar to 1).  If 230/500, its d=500;  63/28, where d is 28.  

Q2:Bearing inner diameter 20 outer diameter 42 thick 16mm model  

INA SL18 3004 bearing INA brand SL1830 series fully loaded cylindrical roller bearings;  Unidirectional positioning bearing.  

SKF 63004-2RS1 bearing SKF single row sealed deep groove ball bearings  

SKF NUC 3004 CV bearing SKF brand single row full load cylindrical roller bearing.  

Double row Angular contact ball bearings with ball Notch (Type 00000)  

Double row Angular contact ball bearings with ball Notches (Type 00000)

Q18:How big are the inner diameter and outer diameter of the 308 bearing and the ball bearings?  

The national standard stipulates how much steel ball and quantity  

The diameter of the steel ball is 15.081, with 8 pellets in total  

Q3:Bearing 6204 weight is how many a set  

Bearing model: 6204 New model: 6204  

NSK series: Deep groove ball bearings  

Inner diameter (D) : 20mm Outer diameter (D) : 47mm thickness (B) : 14mm  

Dynamic load: 12800Cr/kg Static load: 6600Cr/kg  

Limit speed: 18000 Rated speed: 11000  

Quality (kg) : 0.107kg  

Description: Open, NSK deep groove ball bearings  

Q4:Bearing model RNNCF5018V significance  

Model: RNNCF5018V  

Type: double row full loaded cylindrical roller bearings  

Brand: SKF  

The meaning of each character in the model:  

R: Separated bearings without inner or outer rings  

NNCF, double row cylindrical roller bearing without cage, having a single flange on the outer ring, with a spring lock ring and an oil groove  

5018: Basic model.  Dimensions (mm) : inner diameter 90, outer diameter 140, thickness 67  

V: Full load roller bearing (without cage)  

Q5:What bearing is 6902ZZ  

Model: 6902 zz  

Type: deep groove ball bearing  

Suffix ZZ: Dust cover on both sides  

Inside diameter: 15 mm  

Outer diameter: 28 mm  

Thickness: 7 mm  

Brand: NSK  

Q6:What is the meaning of bearing DN value?  

The limit DN value of sliding linear velocity [the product of bearing inner diameter (mm) and shaft speed (r/min)] has been studied on bearings with DN value of 3.0×10 ^ 6 in foreign countries, while the current situation in China is 2.5 ~ 3.0×10 ^ 6, which has a certain gap.  

Q7:What type of bearing does 1511 bearing seat use?  

1511 bearing seat generally has two kinds, one is the bearing used for small hole is 1211K, 2211K, 22211K  

6211,1211,2211,22211 for the large hole  

Q8:What is the meaning of F3 in bearing type suffix CAF3?  

The rear code of the bearing indicates the bearing’s internal structure changes, sealing and dustproof and external shape changes, cage and material changes, tolerance levels, clearance groups, configuration forms and other characteristics.  

CA: Type C self-aligning roller bearing, inner ring with retaining edge, movable retaining ring, solid cage.  

F3: Cage material code, ductile iron.  (Good wear resistance)  

Please check the bearing structure to see if it meets.  

Due to too many types, here can not be a comprehensive list, please forgive me.  

If you are engaged in mechanical design and manufacturing industry, it is recommended to consult the mechanical design manual.

Q9:What is the size of 6202 bearing spring?  

The inner diameter of the 6202 bearing is 15mm, so the specification of the spring is 15mm, the inner diameter is 13.8mm, the outer diameter is 16.8mm, and the thickness is 1.0mm.  

Q10:SKF bearing type :280×580×175  

This is the specification of the bearing  

The inner diameter of 280  

Diameter of 580  

The height to 175  

The unit of MM  

The model is 22356 ca