EXTENTION SPRINGS

We produce and design both small traction springs, with wire diameters of 0.30 mm, and large ones with wires up to 32.0 mm, with German, English, rotary or other special eyelets.

Applications:
Spare parts, moorings, valves, mechanics in general, model making, toys, earthmoving, naval, vibrators, food, door communication, biomedical, oenological, etc.

Standard Materials:
carbon steels, alloy, stainless steel

Diameters of wire ø: 0.30 mm to 32.00 mm
(for larger diameters we use external qualified suppliers)

Surface treatments:
Shot blasting, Sandblasting, Oiling, Galvanics in general and Painting

TRACTION SPRINGS PARAMETERS

• d (wire diameter): this parameter indicates the thickness of the wire used to produce the spring.
• De (external diameter): the external diameter of a spring depends on both the hooks and the coils. The tolerance for this parameter is +/- 2% (indicative).
• H (Reaming): this is the minimum diameter of operation of the spring. The tolerance for this parameter is +/- 2% (indicative).
• Ln (maximum length): maximum length of elongation acceptable for the spring. It is also the maximum elongation for static applications. The tolerance for this parameter is +/- 15% (indicative).
• Fn (maximum force): maximum force that can be exerted on the spring. The tolerance for this parameter is +/- 15% (indicative).
• L0 (free length): the free length is measured in the free state of the spring. The tolerance for this parameter is +/- 2% (indicative).
• Number of turns: Total number of turns in the spring. The image above contains six.
• R (Stiffness): this parameter determines the resistance of the spring during its stretching. It is measured as follows: 1 DaN / mm = 10 N / mm. The tolerance for this parameter is +/- 15% (indicative).
• L1 & F1 (length with force F): the force F1 which involves the lengthening of the spring to length L1, can be calculated starting from the formula: F1 = Fn - R (Ln-L1) from which the length L1 = Ln derives - (Fn-F1) / R.
• Hooks: The extension springs with German hooks are produced in two versions, with the position of the hooks at 0 degrees and 90 degrees as indicated by the image above.
• Code: all the springs are identified by a unique code: type. (De * 10). (d * 100). (L0 * 10). material. [X - if the hooks are perpendicular]; for tension springs with German hooks, the type corresponds to the letter U; the materials are identified by the letters A and I. Example: the code U.063.090.0100.AX is a spring with an external diameter of 6, 3 mm, in steel wire of 0, 9 mm and a free length of 10 mm, with hooks positioned at 90 degrees.