HONSEL bolts

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.

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

  • 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

  • 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

During the hardening process, scale forms on the outside of the stud because the glowing hot metal reacts with the oxygen in the air. These thin residues from the oxidation process can be barrel finished so that the stud has a glossy surface again.

At the same time, barrel finishing reduces the friction coefficient (COF) of the bolts – a precondition for longer service lives of the finished products. As with all other process steps, HONSEL attaches great importance here again to being able to carry out barrel finishing in-house.

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.

  • Gearboxes
  • Clutches
  • Engines
  • Seats


The HONSEL experts from all the departments in our company are at your disposal with advice and assistance and will be happy to support you in meeting your requirements. Ask us!


HONSEL automation has development and production operations at its Fröndenberg facility. Every single step of the production process, from the customer briefing to the initial CAD-designs, the prototypes and the ready-to-manufacture products


The guiding principles are our compass and form the basis for our guidelines and behaviour within HONSEL Umformtechnik.