42.0001.6336 - Fronius Contact Tip Holder Clamping Nut SW11x18.5

Genuine Fronius Clamping Nut SW11x18.5 (42.0001.6336)

The Fronius Clamping Nut SW11x18.5 (Part Number: 42.0001.6336) is a critical component designed for the precision assembly of Fronius MIG/MAG welding torches. As an original equipment manufacturer (OEM) part, it meets the exacting standards required for high-performance industrial welding environments. This clamping nut, often referred to as a contact tip holder, serves as the primary interface between the torch neck and the contact tip, ensuring both mechanical security and efficient electrical current transfer.

Manufactured from high-grade conductive alloy, this component is engineered to withstand the thermal cycling and mechanical stresses inherent in continuous welding operations. The SW11 designation indicates an 11mm wrench size, allowing for standardized maintenance procedures using common workshop tools. The 18.5mm length is specifically calibrated to position the contact tip correctly relative to the gas nozzle, which is vital for maintaining proper gas coverage and preventing porosity in the weld pool.

In the Fronius torch ecosystem, particularly within the MTG (gas-cooled) and MTW (water-cooled) series, the clamping nut plays a pivotal role in heat dissipation. A loose or inferior quality holder can lead to increased electrical resistance, causing the torch neck to overheat and potentially damaging the contact tip or the torch body itself. By utilizing this genuine Fronius spare, operators ensure that the thread engagement is precise, minimizing the risk of cross-threading or loosening during operation due to vibration.

This part is essential for maintenance and repair operations (MRO) focused on keeping welding automation and manual stations running at peak efficiency. Regular inspection of the clamping nut is recommended; signs of wear such as thread degradation or spatter buildup on the seating surfaces indicate the need for replacement to maintain arc stability and weld quality.