Tab. 1  SEL/Y [Tol.]
CODE  D  d  

SEL/Y 050  126  0,011  50  0,008 
SEL/Y 080  146  0,011  80  0,009 
SEL/Y 100  185  0,015  100  0,01 
SEL/Y 120  210  0,015  120  0,01 
SEL/Y 150  240  0,015  150  0,013 
SEL/Y 180  280  0,018  180  0,013 
SEL/Y 200  300  0,018  200  0,015 
SEL/Y 260  385  0,02  260  0,018 
SEL/Y 325  450  0,023  325  0,023 
SEL/Y 395  525  0,028  395  0,023 
SEL/Y 460  600  0,028  460  0,023 
SEL/Y 580  750  0,035  580  0,025 
SEL/Y 650  870  0,05  650  0,04 
SEL/Y 850  1095  0,063  850  0,05 
SEL/Y 950  1200  0,063  950  0,05 
Assembly and adjacent elements
libe recommends to get an easy coupling between the bearing and the construction to which it has to be screwed.
Exception to this recommendation are the cases where a very precise positioning is required.
A forced coupling might cause modification in the internal tensions.
If a very forced coupling is necessary, this condition should be clearly mentioned when ordering the parts.
The other elements which will be coupled with the bearings type SEL/Y have to guarantee and keep sufficient rigidity to prevent deformations due to coupling or screw assembly.
Tab.2  SELY [Ka Kr Kt]
Ka  Kr  Kt  

[KN/μm]  [KN/μm]  [KNm/mrad]  
SEL/Y 050  1,3  1,3  1,25 
SEL/Y 080  1,6  1,8  2,5 
SEL/Y 100  2  2  5 
SEL/Y 120  2,1  2,2  7 
SEL/Y 150  2,3  2,6  11 
SEL/Y 180  2,6  3  17 
SEL/Y 200  3  3,5  23 
SEL/Y 260  3,5  4,5  45 
SEL/Y 325  4,3  5  80 
SEL/Y 395  4,9  6  130 
SEL/Y 460  5,7  7  200 
SEL/Y 580  6,9  9  380 
SEL/Y 650  7,6  10  550 
SEL/Y 850  9,3  13  1100 
SEL/Y 950  10,4  14  1500 
Tab. 3  [MRL]
CODE  MRl 

[Nm]  
SEL/Y 050  2,5 
SEL/Y 080  3 
SEL/Y 100  3 
SEL/Y 120  7 
SEL/Y 150  13 
SEL/Y 180  14 
SEL/Y 200  15 
SEL/Y 260  25 
SEL/Y 325  48 
SEL/Y 395  55 
SEL/Y 460  70 
SEL/Y 580  140 
SEL/Y 650  200 
SEL/Y 850  300 
SEL/Y 950  600 
Tab.3  SEL/Y [Runout]
H1  axial/radial runout  

±[mm]  [μm]  
SEL/Y 050  0,125  2 
SEL/Y 080  0,15  3 
SEL/Y 100  0,175  3 
SEL/Y 120  0,175  3 
SEL/Y 150  0,175  3 
SEL/Y 180  0,175  4 
SEL/Y 200  0,175  4 
SEL/Y 260  0,2  6 
SEL/Y 325  0,2  6 
SEL/Y 395  0,2  6 
SEL/Y 460  0,225  6 
SEL/Y 580  0,25  10 
SEL/Y 650  0,25  10 
SEL/Y 850  0,3  12 
SEL/Y 950  0,3  12 
Tab.4  SEL/Y H1R H2R .RI
H1R  H2R  ax/rad. runout RI 


±[mm]  ±[mm]  [μm]  
SEL/Y 050  0,025  0,02  1 
SEL/Y 080  0,025  0,02  1,5 
SEL/Y 100  0,025  0,02  1,5 
SEL/Y 120  0,025  0,02  1,5 
SEL/Y 150  0,03  0,02  1,5 
SEL/Y 180  0,03  0,025  2 
SEL/Y 200  0,03  0,025  2 
SEL/Y 260  0,04  0,025  3 
SEL/Y 325  0,05  0,025  3 
SEL/Y 395  0,05  0,025  3 
SEL/Y 460  0,06  0,03  3 
SEL/Y 580  0,075  0,03  5 
SEL/Y 650  0,1  0,03  5 
SEL/Y 850  0,12  0,03  6 
SEL/Y 950  0,12  0,03  6 
It is possible to use one more washer (not supplied) as support to the inner ring to increase the rigidity capacity of the bearing (assembly type VRI) – to be specified when ordering.
The bearings SEL/Y have to be assembled with screws having resistance class 10.9 through a torque wrench M (selected for each size). The screw tightening has to be carried out by crosswise sequence in three step. This procedure will allow a selfbalance of the tightening forces in the screws.
The bearings series SEl/Y are supplied with two screws suitable for transport.
These screws can be loosened during centering to make operations easier but they have to ben tightened through wrench M (like the fixing screws) during final assembly.
ATTENTION: the bearings must not be dismounted! The screws used during transport must NEVER be completely loosened!
ATTENTION: incorrect screw assembly, in the inner ring especially, might cause wrong preload, thus compromising axial and radial runout!
ATTENTION: if the assembly requires heating of the bearing or heating of the other components, please wait until the parts returned completely cold before starting working operations.
Rigidity
Rigidity is the capacity of a part to oppose the elastic deformation caused by a force applied on it. In short the formula is below, rigidity of a part k is deformed to quantity δ because of applied force P:
k = P/δ
The higher rigidity, the less will be the deformation borne when the part is subjected to the load. Bearing SEl/y is marked by high rigidity to tilting moments and to axial and radial forces.
This capacity make it the right choice in the working conditions where a high running precision is demanded when the load is applied.
Ka = axial rigidity
Kr = radial rigidity
Kt = tilting moments rigidity
Frictional torque
Frictional torque M_{RL} hows the resistance to be won to keep the bearing rotation and it depends on more factors:
> running speed
> type and quantity of lubricant
> preload
> load applied
for this reason, the value M_{RL} has to be considered purely an indication and referred to an even
rotation of 5 RPM at grease lubrication.
The starting torque or the torque at a different RPM could be slightly higher than reported.
The use of an additional washer for the inner ring (execution VRI) makes an increase of the frictional torque unavoidable.
Lubricant
Bearings type sEl/y are supplied with grease DIN 51825 KP2N30 with mineral oil base and able to bear temperatures range 30/+140 °C.
The bearing can be relubricated through the holes in the inner and outer rings.
LIBE guarantees that the bearings are supplied with the correct quantity of lubricant.
However we recommend to carry out a few rotations of the bearing while it is fixed without load to permit the correct distribution of the lubricant before putting it into use.
ATTENTION: too much lubricant can have consequences on the resistance to rotation M_{RL} and on temperature production. In cases of overlubrication, please contact libe engineering department.
Tolerances – Axial and radial runout
ATTENTION: values related to completely fixed bearings.
Executions with restricted tolerances
libe bearings series sEl/y can be requested with:
 running tolerances (planarity and runout) restricted 50%: …RI
 reduced dimensional tolerances H1: …H1R
 reduced dimensional tolerances H1 and H2: …H1H2R
ATTENZIONE: values related to completely fixed bearings.
Example of order: 1 bearing SEL/Y inner diameter 150 mm, reduced tolerances H1 and H2 and with restricted running tolerances will have following LIBE designation:
SEL/Y150.H1H2R.RI