Bolzen - the art of


As a specialist for cold forming, HONSEL manufactures customised solid parts with close tolerances in a wide range of geometries. The specialised manufacturing depth and the 100 % quality control of the produced parts are the hallmarks of the company.

HONSEL bolts, installed in millions of clutch systems worldwide, are a first-class example of this.

Collar-type bolts

  • Always riveted from both sides
  • Shaft diameter up to 12 mm
  • Variable shaft lengths
  • Shaft with and without bore

Spacer bolts

  • Riveted from one side
  • Up to 28 mm head diameter with max. 12 mm shaft diameter
  • Shaft and head round as standard
  • Oval geometries possible
  • Head punch designed individually to the customer’s wishes

Asymetrische Bolzen

  • Up to 12 mm shaft diameter
  • Variable shaft lengths
  • Asymmetric head geometries possible to meet customers’ wishes

Tolerance optimised

The automotive industry accepts only minimal tolerances. Suppliers have to constantly ensure that every product supplied always meets these stringent specifications. Less than 0.07 mm – that is the concentricity tolerance that HONSEL can guarantee the automotive customer. And HONSEL is less tolerant also when it comes to the length: A coil may deviate in length by only +/- 0.05 mm. HONSEL customers appreciate this precision.

Barrel finishing

Während des Härtevorgangs entstehen auf der Außenseite der Bolzen „Verzunderungen“, weil das glühend heiße Metall mit dem Luft-Sauerstoff reagiert. Diese dünnen Reste des Oxydationsprozesses können gleitgeschliffen werden, so dass der Bolzen danach regelrecht „glänzt“.

Gleichzeitig minimiert Gleitschleifen die Reibwerte (RZ) der Bolzen – Voraussetzung für höhere Standzeiten des Endproduktes. Wie bei allen anderen Prozessschritten legt HONSEL auch hier großen Wert darauf, Gleitschleifen im eigenen Haus durchführen zu können.

Hardened to the point

The cold forming process alone changes the starting material in such a way that it becomes harder on its own. But this is generally not enough. The stud is exerted to huge forces when it is installed in the clutch of a motor vehicle. For this reason they have to be hardened so that they become more resistant. But they don’t have to be hardened all over, because if a stud is too hard, it will break during assembly. Partial hardening is the solution. Predefined partial areas are hardened to a precisely defined material depth to a defined degree of hardness. HONSEL has mastered the art of “hardening to the point” so well because this process takes place in-house.

Application examples

  • Gearboxes
  • Clutches
  • Engines
  • Seats

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