Industrial steel wire springs are used in many sectors: automotive, construction, hardware, furnishing, agriculture, and in all manufacturing or craft activities that require the mounting of springs on machinery and tools.

In our spring factory, we specialise in the production of coil springs with wire diameters from 8 to 30 mm. At BSA, our approach to manufacturing is both artisanal and industrial: we are one of the few Italian companies specialised in the production of small series and single pieces.

Custom-made springs in raw or pre-hardened steel

To bear heavy loads, we produce springs that are more robust than the original design, using high quality raw or pre-hardened steel. The result is an excellent custom-made product.

The entire manufacturing process – from cutting the steel wire to tempering, from pressing to painting the spring – is supervised and controlled by expert technicians to ensure a truly reliable and long-lasting product, whatever its final use will be.

1. Selection and cutting of material

The production of a BSA industrial spring starts with cutting a steel wire, whether raw or pre-hardened, depending on the desired size and use.

2. From manual assembly to computer numerical control (CNC)

Based on the diameter and pitch of the spring, the technician mounts the appropriate spindle and sets the ratio between the spindle rotation speed and the dolly feed speed. When the coil has a double diameter, the correct curve is obtained at all points of the steel wire using a lathe dog and tailstock. After the first spring has been created by operating the machine manually, its movements are then stored in the computer numerical control (CNC). In this way, subsequent pieces are produced automatically, thereby ensuring the repeatability of the movements and, as a result, of the specific dimensions of the semi-finished product.

3. Deburring

After being processed with the lathe, the spring is put into a vice where we remove any burrs…

4. Cropping

...or we crop it using a cutting disc.

5. Grinding

If necessary, pendulum grinding follows.

6. Measuring

If pendulum grinding is not required, the piece goes directly to the press for measuring, i.e. to check the vertical axis and to ensure that the spring has the right amount of yield.

7. Hardening and tempering

In order to achieve the desired hardness, raw steel springs are tempered in state-of-the-art temperature-controlled furnaces; pre-hardened steel springs are tempered at a temperature of 350°/400°C in the shaft furnace.

8. Testing, painting...delivery!

At the end of the heat treatment, the spring is tested with a press that compresses it and releases it. The processing of your custom-made spring is now complete. All that remains is to paint, package and deliver your product!