We offer three different forms of tolerance sleeves to meet the different conditions.
The selection of whether to use an AN, BN or AL version depends primarily on the planned installation/assembly type and the associated design of the connecting parts.
If the “shaft” is fixed in diameter and cannot be reworked (e.g. roller bearing outer ring, motor output shaft, stator package, etc.), an AN type (standard shaft) is generally used. The bore or groove diameter (for centered installation) is then adapted to the application. During assembly, the “shaft” is then pressed into the outer part with the tolerance sleeve inserted.
If the bore is fixed (roller bearing inner ring) or if reworking is easier on the shaft (e.g. with a groove), a BN type is generally used (standard bore) and the shaft diameter is adjusted. The tolerance sleeve is then pulled onto the shaft and pressed together with the tolerance sleeve into the receiving bore.
Fundamental considerations also play a role in the selection. For example, if the connecting parts are made of different materials, the tolerance sleeve should preferably be pressed into the harder material during assembly. In addition, if the outer part is made of aluminum and the shaft is made of steel, an AN type should be used if possible so that the relative movement during pressing occurs between the tolerance sleeve and the steel shaft and not the aluminum part. On the other hand, with very small diameters of the connecting parts and a planned centered installation, a BN type is preferable, as the tolerance ring can be more easily pulled onto a shaft with a groove than inserted into a bore with a groove, as the ends must first be overlapped during assembly.
For various standard bores or shafts with diameters from 6 to 250 millimeters, Dr. Tretter AG has a large selection of standard sizes, made of stainless steel as standard, in stock. For special applications such as high temperatures, tolerance sleeves made of Hastelloy C-276 can be used.
The high-quality stainless steel 1.4310 (X10CrNi18-8) is processed as cold-hardened strip and does not require any further treatment. Thanks to the rust-resistant material, the tolerance sleeve is also suitable for applications in which water or chemical corrosion play a role. The max. Operating temperature is 250° C, briefly up to 300°C
Tolerance sleeves made of Hastelloy can be used at operating temperatures from -70 °C to 480°C. Smaller quantities can now be obtained cost-effectively (considering the material costs and the usual minimum order quantities) usually within 4-8 weeks.
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