medias® professional – Product catalogue
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Rolling and plain bearings, accessories
Transparent classification of our bearings for rotary motion.
Linear guidance systems
Transparent classification of our linear bearings.
Selection wizards
Bearing selection
The wizard will assist you in the selection of the correct bearing for your design.
Linear selection
The wizard will assist you in the selection of the correct linear guidance system for your design.
Housing selection
The wizard will assist you in the selection of the correct housing for your design
Application examples
Suggestions for your daily work.
Lubricant selection
Lubrication is a design element. You can find the right grease or oil here.
Principles
Here you can find fundamental knowledge on the calculation, lubrication and fitting of bearings.
Lexicon
Here you can find explanations of terms in bearing technology
Interchange list - designations
From this list, you can use the old designation to find the new uniform designation of INA and FAG.
medias® campus
Our online training courses gives you the necessary rolling bearing knowledge in the form of short learning units.
medias® interchange
This function determines appropriate INA and FAG bearings based on designations from other manufacturers.
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medias® Home Description HK..-2RS
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Accuracy
Drawn cup needle roller bearings

Accuracy
 
 

The main dimensions of the bearings conform to DIN 618/ISO 3 245.

  
 

The thin-walled outer rings adopt the dimensional and geometrical accuracy of the housing bore.

  
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Enveloping circle

  

In the case of bearings without an inner ring, the dimension for the enveloping circle Fw is used instead of the radial internal clearance. The enveloping circle is the inner inscribed circle of the needle rollers in clearance-free contact with the outer raceway.

  
 

Once the bearings are fitted, the enveloping circle Fw is approximately in tolerance zone F8; for bore tolerances to table. Deviations for the tolerance zone F8, see table.

  

Inspection dimensions

  

The enveloping circle is determined on the basis of the inspection dimensions in the table according to DIN 620-1.

  
   
achtung  

Bearings used for enveloping circle measurement should not be repeatedly pushed in and out of the gauge. Bearings that have been checked in the ring gauge should not be used again.

  
   

Inspection dimensions for drawn cup needle roller bearings

  

Enveloping circle
 Outside diameter
 Ring gauge bore
Actual dimension
 Enveloping circle
Upper deviation
 Lower deviation
Fw
mm
 D
mm
 mm
 μm
 μm
2
3
 4,6
6,5
 4,587
6,484
 +24
+24
 +6
+6
4
5
6
 8
9
10
 7,984
8,984
9,984
 +28
+28
+28
 +10
+10
+10
7
8
9
10
 11
12
13
14
 10,980
11,980
12,980
13,980
 +31
+31
+31
+31
 +13
+13
+13
+13
12
12
13
14
15
16
17
18
 16
18
19
20
21
22
23
24
 15,980
17,980
18,976
19,976
20,976
21,976
22,976
23,976
 +34
+34
+34
+34
+34
+34
+34
+34
 +16
+16
+16
+16
+16
+16
+16
+16
20
22
25
28
30
 26
28
32
35
37
 25,976
27,976
31,972
34,972
36,972
 +41
+41
+41
+41
+41
 +20
+20
+20
+20
+20
32
35
40
45
50
 39
42
47
52
58
 38,972
41,972
46,972
51,967
57,967
 +50
+50
+50
+50
+50
 +25
+25
+25
+25
+25
55
60
 63
68
 62,967
67,967
 +60
+60
 +30
+30

 
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