Technical data - SOYER threaded studs for capacitor discharge welding


SOYER® welding studs and pins correspond to DIN EN ISO 13918 and are suitable for manual and fully automatic feed.

General tolerances as per DIN ISO 2768-m. Welding studs with modified tolerances can be supplied on request, the same applies to intermediate and extra lengths.

Materials and strength properties

SOYER® welding studs are supplied in the following standard materials:

- Steel 4.8 per DIN EN ISO 898-1, suitable for welding

- Stainless steel A2-50 (type according to our selection)

- Brass Cu Zn 37 zh (Ms 63) as per EN 12166

- Aluminium AIMg 3, F 23 as per DIN EN 1301-2

Other materials or strengths on request and by agreement.

Upon request, a 3.1B certificate in compliance with DIN EN 10204 can be supplied with each consignment.

Type of studs

SOYER® welding studs are supplied as the medium type specified by DIN ISO 2768-m. They are cold-formed in the manufacturing process. Welding studs made of steel have a galvanic copper coating of 4.8 μm as a protection against corrosion as per DIN EN ISO 4042.

A selection of surface coatings, such as nickel, cadmium, zinc or others are available on request and by agreement.

Technical conditions of delivery

SOYER® welding studs are supplied at quality limit (AQL) 1.5 as per DIN ISO 3269. The studs are delivered in a degreased state and free of impurities. The quantity tolerance can amount to up to ± 5% of the order quantity.

Order instructions

To facilitate order processing, please state stud types, stud diameter, stud length, stud internal thread size and material.

As well as the standard package containing 500 pieces, we also offer packaging units with 100 pieces for minimal quantities of less than 500 pieces. Exceptions include insulation nails and cupped head pins: Here the minimum packaging unit is 1000 pieces.

Ignition tip

SOYER® welding studs have a cold-formed, calibrated ignition tip with an exacting tolerance in length and diameter. The ignition tip is used to initiate the electric arc and control the welding time. Optimum welding results depend mainly on the precision of the ignition tip.

Stud flange

SOYER® welding studs are principally equipped with a cold-formed flange (see table of dimensions). It prevents the electric arc from sparking to the cylindrical stud shaft and increases the welding area. This ensures high quality weld joints. Flanges of other dimensions can only be supplied on request and by arrangement. The use of studs without flange can only be recommended – according to the individual requirements – in a limited number of cases.


SOYER® welding studs have a cold-rolled thread as per DIN ISO 724, tolerance 6g. Other threads and tolerances on request and by agreement. The grain flow is not interrupted and the surface strength is increased by 1.5 to 2 times. The thread is therefore less subject to wear and tear and more resistant to corrosion because of reduced surface roughness. If the studs are surface-coated (e.g. copper-plated), the thread tolerance is 6h. During the welding process, slight variations in tolerance may be caused by the power transmission to the thread crests.

Quality assurance

To protect them against undesirable contamination, humidity, oxidation etc., SOYER® welding studs should be stored in the original packaging until they are used. The use of SOYER® welding studs ensures optimum welded joints of uniform quality!

Product quality

Please observe that we only deliver goods of consistently high quality. We guarantee perfect welding quality.

Faulty welds and all the associated repair and follow-up costs are thus ruled out from the beginning.


The test method to “Ensure the quality of stud welded joints” with capacitor discharge welding is described in detail in DIN EN ISO 14555.