What Are Our Concerns About Bearings（20）

Q1:No inner single row needle roller bearing NK6/10, what are the specific parameters of this type of bearing?  

A:Nk6/10 Details:  

Outer diameter D:2mm;  

Inner diameter d:6mm;  

Width B:10mm;  

Basic rated static load:2.40KN; 

 Basic rated dynamic load: 1.90KN;  

Limit speed: 22000r/min (grease lubrication), 32000r/min (oil lubrication);  

Weight: 5.1g;  

Q2:Why generally on a shaft of rolling bearings, the selection of two sets of bearing diameter size to be the same?  

A:Not necessarily: almost no bearing on a machine tool spindle has the same outer diameter.  

The diameter of the two sets of bearings should be the same, mainly for the convenience of design and processing.

Q3:What does the RNA in front of the bearing mean?

A：Bearings without detachable inner or outer rings  

Needle roller bearings without inner ring (except NK\NKS\NKH needle roller bearings, stamped needle roller bearings with outer ring and combined needle roller bearings)

Q4:How to distinguish the types of bearings?

A:The new standard is Double row angular contact ball bearings  

1. Self-aligning ball bearing  

2 self-aligning roller bearing and thrust self-aligning roller bearing  

Tapered roller bearing  

Double row deep groove ball bearings  

Thrust ball bearing  

6 deep groove ball bearings  

7 Angle contact bearings  

Thrust cylindrical roller bearing  

N Cylindrical roller bearing and double row cylindrical roller bearing NN  

U Outer spherical bearing  

QJ four point contact ball bearing  

The old standard is  

Class 0 deep groove ball bearings  

Class 1 Self-aligning ball bearings  

Roller bearings, class 2  

Class 3 aligning roller bearings  

Class 6 angular contact bearings  

Class 7 tapered roller bearings  

Class 8 thrust ball bearings  

Class 9 thrust roller bearings  

Q5:What is the specific model of needle roller bearing model 17, 25, 18?

A:The model without outer ring is K17X25X18  

The model with stamped outer ring is HK17X25X18 

Q6:What type of bearing is 40*62*22? What is the difference between RNA and NA？

A:Bearing models that meet the size of 40*62*22 mm are as follows:  

NAV4908: Full load needle roller bearing  

2, NA4908: needle roller bearing with cage  

For INA FAG brand, RNA type is needle roller bearing without inner ring, NA type is needle roller bearing with inner ring.  

Q7:What size is HK37/20 needle roller bearing?

A:HK is stamped outer ring needle roller bearing. Needle roller bearing is different from ordinary rolling bearing in appearance  

37/20 37 is the inside diameter, 20 is the thickness  

Q8:How to troubleshoot needle roller bearings?

A:First see whether the noise is too large (about 80 or 90 decibels above), and then see whether the temperature is too high (80 degrees Celsius above), and then see whether the lack of oil, check the heat dissipation conditions. 

Q9:What does needle roller bearing 889104 mean?

A:Bearing type: thrust roller bearing  

New model: AXK2035  

Old model: 889104  

Inner diameter (mm) : 20  

Outer diameter (mm) : 35  

Width (mm) : 2  

Grease lubrication speed (r/min) : 8000  

Rated dynamic load Cr(KN) : 11.1  

Rated static load Cor(KN) : 43  

Q10:What is the model of plane thrust needle roller bearing 12*26*4?

A:Thrust deep groove ball bearing 51101  

Main dimensions according to DIN 711/ISO 104, unidirectional, separable.  

Inner diameter d:12mm    outer diameter D:26mm

thickness B:9mm  

Q11:What occasions are deep groove ball bearings suitable for?

A:Deep groove ball bearing  

Typical rolling bearings, widely used  

It can bear radial load and bidirectional axial load  

Suitable for high-speed rotation and low noise, low vibration occasions  

Sealed bearing with steel plate dust cover or rubber seal ring is pre-filled with appropriate amount of grease  

Bearings with stop rings or flanges on the outer ring are easy for axial positioning and installation in the housing  

The size of the large-load bearing is the same as that of the standard bearing, but there is a filling groove in the inner and outer rings, which increases the number of balls loaded and improves the rated load  

Main applicable cage: steel plate stamping cage (waveform, crown…  Single row;  S form…  Double row)  

Copper alloy or phenolic resin cutting cage, synthetic resin forming cage  

Main applications: Automotive: rear wheel, transmission, electrical components  

Electrical: general motors, household appliances  

Others: instrumentation, internal combustion engine, construction machinery, railway vehicles, loading and unloading and handling machinery, agricultural machinery, various industrial machinery  

Q12:Inner diameter 30mm outer diameter 38mm thickness 16mm, what type of needle roller bearing is it?  

A:There are four kinds of bearings:  

1, new model: KZK/30×38×16  

2, new model: F/30×38×16;  Old model: 40941/30K  

3, new model: K/30×38×16;  Old model: K303816  

4, new model: HK/30×38×16;  Old model: 47941/30K  

Q13:what model is Wuling light transmission needle roller bearing？

A：SC63 K202525  

For SC69, K354027(1.2. Reverse) K303527 (3 gears) K27.533.522 (5 gears)  

Q14:What are the basic components of rolling bearings?

A:It is composed of inner ring, outer ring, rolling body and cage.  Rolling element is the core element of rolling bearing, it makes the sliding friction between relative moving surfaces into rolling friction.