140.0379 - Binzel Style M6 Contact Tip .045 (1.2mm) for MB25/MB36 MIG Guns

Reliable Current Transfer for Industrial MIG Welding

The Binzel Style M6 Contact Tip (.045" / 1.2mm) is an essential consumable designed to maintain the efficiency and precision of your MIG welding operations. Engineered to fit the widely used 142.0010 tip holder, this contact tip is a direct replacement for the standard 140.0379 part number found in many Binzel-style MIG guns, including the MB24, MB25, MB26, and certain configurations of the MB36 series. In industrial manufacturing, the contact tip serves as the final point of electrical transfer to the welding wire; therefore, the quality of its material and machining directly impacts arc stability and weld quality.

Manufactured from high-grade copper (E-Cu), this tip provides superior thermal and electrical conductivity. This ensures that the welding current is transferred efficiently to the wire with minimal resistance, reducing heat buildup at the contact point which can lead to premature failure or burnback. The M6 thread is precision-cut to ensure a tight, secure fit within the gas diffuser or tip holder, preventing loose connections that can cause arcing inside the gun head. With a length of 28mm, it adheres to standard dimensions for seamless integration into existing torch setups without the need for modification.

The bore of this contact tip is drilled to a precise .045" (1.2mm) diameter with a tolerance designed to accommodate thermal expansion while maintaining good electrical contact. This balance is critical: a bore that is too tight will cause wire drag and bird-nesting at the feeder, while a bore that is too loose will result in micro-arcing and an unstable arc. This product strikes the ideal balance for smooth wire feeding. It is suitable for use with solid mild steel and stainless steel wires in general fabrication, automotive repair, and structural steel applications. Regular replacement of contact tips is a standard maintenance procedure that prevents downtime and ensures consistent weld bead aesthetics.