Design guidelines

Shaft/counterface

The usual steels used in mechanical engineering are sufficient for the shaft running surface. Due to the low contact pressure of the seal, there is no need for post-treatment.

General requirements according to DIN 3760 and 3761:

• Rz = 1-5 μm (the latest publications in the field of sealing technology recommend an Rz value of 3 to 5 μm)
• Rmax ≤ 6.3 μm
• Swirl-free
• Diameter tolerance H11
• Roundness IT8

Recommendations for the mechanical production of the mating surface:

• According to DIN 3760 and 3761: Grinding in plunge cut with complete burnout, uneven speed ratio! (Very suitable procedure.)
• Hard turning with a very low feed rate may also be suitable. However, it depends on the individual case, which is why we cannot recommend this without reservation.
• Scoring orthogonal to the sealing surface must be avoided, which is why we strongly advise against any manual reworking.
• Shaft coatings can significantly increase the frictional power of the overall system; preliminary tests should be carried out on coated shafts.
• Do not polish shafts. For sealing points subject to high thermal or mechanical loads, good conditioning of the contact surface is essential. Talk to us so that we can work out the special individual case together.

For sealing points subject to high thermal or mechanical loads, good conditioning of the contact surface is essential. Talk to us so that we can work out the special individual case together.