Precise alignment at every cycle: SVS standards for centering pins & positioning pins
High dimensional accuracy and tight tolerances ensure precise centering and positioning at every cycle. The materials used are wear-resistant and resistant to mechanical stress. The guide surface is manufactured with a low roughness so that the pin slides into the bore without play, does not jam, and neither the bore nor the pin suffers unnecessary wear. For steel centering pins, additional hardening ensures significantly longer service life.
Available in standard dimensions made from Si3N4, full ceramic or ceramic-coated-steel, and customized solutions according to your technical drawings. We tailor the geometry and material precisely to your fixture and process requirements.
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Material options
With its excellent thermal, mechanical, and wear-resistant properties, silicon nitride is an ideal material for welding applications that require high strength, thermal cycling resistance, and electrical insulation.
Zirconium oxide offers high strength and toughness combined with electrical insulation. It is often used in environments with higher mechanical impact. However, due to its sensitivity to thermal cycling, it is not recommended for welding processes involving temperature fluctuations.
Ceramic-coated steel provides excellent performance at a more economical cost compared to full ceramics, though it cannot fully replace them. It offers wear resistance, low friction, and both thermal and electrical insulation. It also protects against lateral shear forces. The ceramic layer is applied via thermal spraying. The core is made from stainless steel (grade 1.4301), and the ceramic coating is available in thicknesses from 150 to 500 µm.
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What lies behind consistent manufacturing quality
All components are manufactured in Germany and can be precisely tailored to your application. Standard versions are immediately available, ensuring short delivery times.
Manufactured with tight tolerances on high-performance machines with stable clamping systems and consistent tool settings to prevent dimensional deviations across series.
Consistently machined contact surfaces with low roughness reduce contact resistance and promote even current distribution across the weld zone.
All electrodes undergo quality-assured testing. For demanding use cases, we offer individual testing according to defined specifications.
We offer bespoke designs based on your technical specifications. Geometry and material are co-developed with your team to meet your production requirements.
Decades of experience shape every SVS product and contribute to the development of technical standards as an active member of the German Welding Association (DSV).
SVS Performance Features
For over 60 years, we have been a reliable partner in welding technology for manufacturers worldwide.
Applications
The function of centering pin in projection welding
In projection welding, two components are joined at defined points using preformed weld projections. The welding current flows specifically through these projections, generating resistance heat at the contact points that melts the material locally. For the current path to run correctly, the projections must be perfectly aligned.
Centering pins perform this task by being guided into specially manufactured holes and aligning the components precisely in terms of surface area and depth. This ensures that each current pulse flows precisely through the intended joining zone and that the projection is completely melted. In automated processes, stable centering ensures consistent component position and repeatable welds.
Quality‑relevant features of centering pins
The interaction between pin geometry and bore tolerance is critical. Even differences of a few hundredths of a millimeter can determine whether the fit is play-free or results in positional deviations in the weld.
Key material properties include hardness, yield strength, and microstructure. Depending on the application, alloyed materials may be required to prevent deformation, wear, and corrosion.
The guiding surface affects both sliding behavior and contact wear. Smooth surfaces ease insertion, prevent jamming, and reduce wear on the pin and bore.
For components with multiple weld points, the alignment of each individual projection determines the current flow. Accurate coordination between the bore, pin geometry, and part positioning is essential for reliable welding performance.
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