Tightening sleeves 
 
Tightening/fitting sleeves are used in order to fit taper bore bearings onto shafts featuring large diametrical tolerance, (H 9 max), thereby avoiding bearing journal grinding. Standard taper is 1/12 for all bearings and sleeves, except for Series 240 and 241 (1/30 taper).

Sleeves are delivered complete with tightening nut and lockwasher, and in compliance with ISO 113/1 Standard.

Sleeve tightening is a critical operation. Refer to the instructions for correct fitting.

Extraction Sleeves 
 
Extraction sleeves ensure a dual function: fitting and adjusting play for taper ball bearings on shafts presenting a shroud our  shoulder and a precision-machined bearing journal.

The extraction sleeve is used in heavy assemblies with bearing handling and adjustment difficulties. Removal requires a nut (sold separately) to be screwed onto the sleeve, and abutting against the face of the bearing. Standard taper is 1/12 for all bearings and sleeves except for Series 240 and 241 (1/30 taper).

Hydraulic Sleeves 
 
Hydraulic sleeves are used for snug fitting of cylindrical bore bearings onto shafts featuring large diametrical tolerances.

To further facilitate tightening and extraction of large size bearings, SNR has developed a large range of hydraulic sleeves.

Their distribution channels and slots allow pressurised oil injection between bearing and sleeve, and between sleeve and shaft. This method is harmless to the mating surfaces. It considerably optimises fitting/extraction times and consequently reduces facility downtimes.

Tightening nuts 
 
Tightening nuts (ISO 2982 Standard) are used for axial attachment of cylindrical bore and tapered bore bearings and for putting out extraction sleeves.

When used in axial attachment mode, they are mounted with the corresponding lockwasher, therefore making up a simple, low cost and low footprint-tightening device.

Precision nuts 
 
Precision nuts are recommended for fitting high precision or standard angular contact ball bearings, and for fitting taper roller bearings and combined needle bearings.

Precision nuts are self-locking. Their threads and flat mating face are machined from one single attachment item, which permits high squareness precision (0.005 mm tolerance).

They are used in order to:

• Preload bearing sets and ensure preload value hold. 
• Maintain the precision level of high precision bearings. 
• Reliably and durably secure, the position of the set of bearings, even non-preloaded, and more particularly in case of high axial loading in operation.