Crucial: The calculation and design of tolerance sleeves

Tolerance sleeves are small but crucial connecting elements. They enable quick, reliable, and economical assembly of cylindrical components and create backlash-free connections that reliably transmit torques and axial forces. Whether for fastening, positioning, or as mechanical overload protection, their correct design is decisive for the function and service life of the entire construction.

During pressing, the sleeve deforms elastically and adapts exactly to the tolerances between the bore and the shaft. This creates a friction-locked connection that works reliably in the long term. For this connection to function, various factors must be taken into account – in particular, shape, material, load, and installation situation.

The right shape for the right application

Depending on the task, different sleeve types are used:

• Form BN – shaft corrugations facing outwards, ends overlapping: Ideal for inner bearing rings, rotors, fan or pump impellers.
• Form AN – shaft corrugations facing inwards, ends apart: Often used for outer bearing rings, stator units, handles or magnetic encoders.
• Form AL – shaft corrugations facing inwards, arc-shaped: Especially for small rolling bearings with high speeds.

Correct calculation

For the calculation of tolerance sleeves, there are guide values that depend on various influencing factors: torque, assembly force, and axial seating force. These can be determined using the known formulas. However, it is important to note that these values serve as a guide. Material strength, surface finish, lubrication, and assembly conditions significantly influence the real behavior.

During free installation, for example, a center offset can occur, which reduces the transmittable torque by up to 20%. Under alternating loads, the permissible radial load also decreases significantly.

Therefore, anyone who wants absolute certainty in the design should contact our application technology department directly. Our specialists support you in the dimensioning – from simple applications to complex projects. This allows development times to be shortened and tailor-made, long-lasting solutions to be realized.

Custom-made products for special requirements

In addition to the standard sizes, we also manufacture customer-specific special sleeves. By varying the material thickness, shaft height, and pitch, properties such as assembly force, torque transmission, and seating force can be specifically adjusted. In addition to our proven Niro material 1.4310, materials such as Hastelloy C-276, Haynes 230, or stainless steel 1.4571 are also available – ideal for high temperatures or aggressive environments.

Use our digital inquiry form to send us your requirements directly – or get personal advice from our experts. Together, we will find the optimal solution for your application.