Selection of the materials we work with
welding consumables


Guide pin design

There are several different shapes and sizes of guide pins - a range of standard designs are held in stock whilst special designs are made to order.

There are four general designs of the “pin nose” for like sized pins.

  • Dolphin nose - long nose. These pins are generally the accepted design for automatic nut feed systems, where the parts to be welded are either manually presented to the tool or via a handling system, i.e. a robot.
  • Dolphin nose – short nose. A hybrid pin which can be used for auto or manual nut feeding.
  • Castleated pins are really only used for manual weld nut loading but will keep the weld nut perpendicular to the panel.
  • Cone nosed pins are more commonly supplied in ceramic and appear to be most common when the nuts are manually loaded.

Dolphin nosed pin - longDolphin nosed pin - short                    Castleated pinCone nosed pin

Guide pin materials

Location Pins can be supplied in different materials:- The pin is normally “insulating” to stop current shunting, so all the current is passed through the projections on the weld nut. The design of the pin is also such that it limits the intervention of weld splash entering the threads of the weld nut.

The most common types of guide pin material and their benefits are listed below:

Ceramic (Solid) Traditionally Silicon Nitride – fully insulated. Grey, White, Beige, Blue. High initial cost but will last longer than any other pin when conditions allow. Susceptible to damage. Repels weld spatter.
Ceramic (Coated) A tool or stainless steel pin sprayed with a thin ceramic coating Grey / Black The ceramic can chip causing the pin to “short”
KCF A special heat treated alloy with a hard, insulating skin Grey / Black A low cost pin with a reasonable lifespan
ACT A tool steel pin with a special insulated surface treatment Grey / Black A low cost pin with a good lifespan
Stainless Steel A non-magnetic, tough steel Silver A low cost pin, lowest lifespan.

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