Kromschroder Connex light spring pin 74921607

Kromschroder Connex light spring pin 74921607 is a spare part used as a mechanical fastener or alignment element in burner and boiler systems. It has a length of 40 mm and a diameter of 3.5 mm. This spring pin is driven into matched holes to secure components subject to vibration or thermal expansion, such as ignition electrodes or flame sensors. It is designed for a standard interference fit and can be removed during service.

Parts of this type are selected by nominal diameter and installed length. The diameter must match the hole in the component and housing, and the length should be sufficient to pass through the parts to be fastened while allowing the ends to be flush or slightly recessed. Spring pins are typically driven into matched holes and rely on a standard interference fit for retention. Before ordering, verify the diameter and length against the original part.

Items of this kind may fail due to wear, corrosion, or fatigue from vibration and thermal cycling. Symptoms include loose components, rattling, misalignment of sensors or electrodes, or intermittent operation. Check for visible damage, deformation, or loss of spring tension, and ensure the pin is fully seated and not backing out.