Hot Forging

We have the capacity to forge bolts of the following diameter: 8ø to 39ø.  We can forge different head shapes depending on your wishes: Hexagonal, countersunk and Round Head Square Neck – JAPY Type. We also realize any specific shape following your design.

The specificity of our machines allows us to offer long forged parts: for example, we manufacture screws M10x1600mm.

Induction heating allows us to have a regular and controlled manufacturing process: no “overheating” of the metal, little forge scale on parts and constant production rates.

We work with different types of material: from the most standard steels S235, S355, C45 to alloy steels 42CrMo4, 34CrMo4, or even stainless steel 304L, 316L, 1.4306, 1.4404,1.4462, 1.4362, etc.

Threading and Thread Rolling

Our thread size range extends from M8 to M190.

Two threading techniques are available:

  • Thread cutting : it can be performed either using specific threading machines, or by bar turning / machining on a numerically controlled lathe.
  • Thread rolling : most of our production is done using this process. The material is in this case deformed by cold rolling. This technique makes it possible to form the thread without breaking fibers of the steel. Parts made by this process have better strength.


With a varied and constantly evolving machine park, our machining / turning production range goes from parts weighing a few grams to the heaviest, up to 1 ton.
Our maximum spindle diameter is 190 mm for a maximum machining length 3000 mm.

Two of our machines are equipped with an automatic loading system to meet medium and large series production needs.


From simple anchor rod to specific U-bolts, BAYONET has developed its folding capabilities over the years.

Depending on the steels used or the wishes of the customers, we can hot or cold bend a range of varied parts in carbon steel or stainless steel. The range starts at 8 mm diameter and goes up to 80 mm diameter for the largest U bolts. The lengths before bending can go beyond 6 meters.

Hot Dip Galvanizing

Bayonet has its own hot-dip galvanizing subsidiary: SMA (Société Métallurgies des Ardennes). Located 5 km from the mother company the surface treatment unit was specially designed for the treatment of threaded bolts. In addition to the classic bolts, the experience acquired over the years allows the company to also galvanize more complex parts such as anchors and threaded rods up to lengths of 2m500.

The company processes more than 2,000 tons of parts per year.

The hot-dip galvanizing process: After degreasing and stripping, either chemical or mechanical (shot blasting), the parts are immersed in a bath of molten zinc. Hot-dip galvanizing is not just surface deposit: a molecular exchange is created between the steel and the zinc. This phenomenon has the advantage of providing perfect adhesion of the coating and making it insensitive to shocks. The final coating has a zinc thickness of around 70 microns.

Do not mix up hot-dip galvanizing with galvanizing or lamellar zinc:

Simple galvanizing is an electrolytic deposit of zinc of about 5 to 10 microns. It is applied cold. This coating is sensitive to shocks.

Lamellar zinc consists of a mixture of zinc and aluminum applied to the parts in one or two layers. It is sensitive to shocks.


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