Rod Ends and Spherical Bearings

The selection and determination of spherical bearing and rod end sizes in Schedule K must be based on the specified load capacity, applied loads and requirements for useful life and operating safety.

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Selection of rod end and spherical bearing size

The selection and determination of spherical bearing and rod end sizes in Schedule K must be based on the specified load capacity, applied loads and requirements for useful life and operating safety. The load ratings specified in the tables serve as definitive characteristic and arithmetic values for the load capacity of the spherical bearings an rod ends.

Load ratings from different manufacturers cannot always be compared with each other, since no standardised load rating definition exists for spherical bearings an rod ends. The following conditions are used as a basis for the load ratings of Askubal heavy-duty spherical bearings and rod ends:

Static load capacity C0 (plain bearings)

The static load capacity C0 is the radially acting static load which does not cause any permanent deformation of the components when the spherical bearing or rod end is stationary, i.e. the load condition without pivoting, swivelling or tilting movements. It is also a precondition here that the operating temperature must be in the normal room temperature range and the surrounding components must possess sufficient stability. The static load capacity may vary by lower or higher temperature according to the material.

Static load capacity C0 (roller bearings)

In the case of Askurol rod ends with roller bearings, the static load rating is the load at which the overall permanent deformation of rolling elements and raceways is max. 0.0001 of the rolling element diameter.

Dynamic load capacity C (plain bearings)

Dynamic load ratings serve as arithmetic values for calculation of the service life of dynamically-loaded spherical bearings and rod ends. The values themselves do not provide any information about the effective dynamic load capacity of the spherical bearing or rod end. To obtain this information, it is necessary to take into account the additional influencing factors such as load type, swivel or tilt angle, speed characteristic, max. permitted bearing clearance, max. permitted bearing friction, lubrication conditions and temperature, etc.

Dynamic load capacities depend on the definition used to calculate them. Comparison of values is not always possible owing to the different definitions used by various manufacturers, and because the load capacities are often determined under completely different test conditions.

Dynamic load capacity C (roller bearings)

In the case of Askurol rod ends with roller bearings, the dynamic load capacity is the load at which 90% of a large quantity of identical rod ends reach 1 million revolutions before they fail owing to fatigue of the rolling surfaces.

Operating temperature

All Askubal spherical bearings and rod ends can be used without restriction in an operating temperature range of between -10 °C bis +80 °C. Different operating temperatures occur a decrease of load capacity of the rod end housing and the bearing therefore the useful life will be reduced too.

Rod end selection

When choosing a rod end be sure that the real load is allways explicitly less than the maximum load capacity of the rod end.

Spherical bearings to DIN ISO 12240-1, Dimension Series K
 

Bearing bore Mating materials steel on high-duty bronze Mating materials steel on PTFE
d C2* normal C3* C2* normal C3*
over incl. min max min max min max min max min max min max
mm   mm                      
3 6 4 34 10 50 42 72 5 30 20 50 40 65
8 10 5 41 13 61 52 88 10 50 40 80 70 100
12 18 6 49 16 75 64 107 15 60 50 100 90 130
20 30 7 59 20 92 77 120 30 70 60 110 100 140
35 50 9 71 25 112 98 150 40 80 70 140 130 180


Spherical bearing to DIN ISO 12240-1, Dimension Series E

Bearing bore Mating materials steel on steel Mating materials steel on PTFE
d C2* normal C3* C2* normal C3*
over incl. min max min max min max min max min max min max
mm   mm                      
2,5 12 8 32 32 68 68 104 0 25 0 32 15 45
12 20 10 40 40 82 82 124 0 30 0 40 20 60
20 35 12 50 50 100 100 150 0 35 0 50 25 65
35 60 15 60 60 120 120 180 0 40 0 60 30 80
60 90 18 72 72 142 142 212 0 50 0 72 35 90
90 140 18 85 85 165 165 245 0 60 0 85 40 100


Spherical bearing to DIN ISO 12240-1, Dimension Series G

Bearing bore Mating materials steel on steel
d C2* normal C3*
over incl. min max min max min max
mm   mm          
2.5 10 8 32 32 68 68 104
10 17 10 40 40 82 82 124
17 30 12 50 50 100 100 150
30 50 15 60 60 120 120 180
50 80 18 72 72 142 142 212
80 120 18 85 85 165 165 245


Spherical bearing to DIN ISO 12240-1, Dimension Series W

Bearing bore Mating materials steel on steel
d C2* normal C3*
over incl. min max min max min max
mm   mm          
2.5 12 8 32 32 68 68 104
12 20 10 40 40 82 82 124
20 32 12 50 50 100 100 150
32 50 15 60 60 120 120 180
50 90 18 72 72 142 142 212
90 125 18 85 85 165 165 245

*) on request


Rod ends to DIN ISO 12240-4, Dimension Series K

Bearing bore Mating materials steel on high-duty bronze Mating materials steel on PTFE
d normal C3* normal C3*
over incl. min max min max min max min max
mm                  
3 6 2 34 12 65 3 35 10 50
8 10 3 41 20 78 5 40 15 55
12 18 3 49 25 93 5 45 15 65
20 30 4 59 30 103 10 55 20 75
35 50 5 71 35 125 10 60 20 80

 

Rod ends to DIN ISO 12240-4, Dimension Series E

Bearing bore Mating materials steel on steel Mating materials steel on PTFE
d normal C3* normal C3*
over incl. min max min max min max min max
mm                  
2.5 12 16 68 34 104 0 25 10 40
12 20 20 82 41 124 0 30 10 55
20 35 25 100 50 150 0 35 15 60


Rod ends on antifriction bearing basis, mounting sizes to DIN ISO 12240-4

Bearing bore Ball bearing Roller bearing
d C2* normal C3* C2* normal C3*
over mm incl.30 minmm 5 max30 min15 max40 min35 max50 min10 max30 min20 max50 min45 max60
Rod Ends and Spherical Bearings
Rod Ends and Spherical Bearings
Rod Ends and Spherical Bearings

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