Tweco 1140-1204 Mig Contact Tip 0.045 in 25 Pack

Product Description

The TWECO 1140-1204 is a heavy-duty MIG contact tip designed for high-amperage welding applications up to 400 amps. It accommodates 0.045-inch wire with a 0.054-inch nominal bore and measures 1.47 inches in length. The tip is machined from 122 DHP copper alloy using extruded or gun-drilled tubing, producing a consistent, smooth inside diameter held to a tolerance of plus or minus 0.003 inches. A 1/4-28 UNF-2A thread connects the tip to the gun diffuser. Sold in packs of 25, this tip is a standard consumable for professional MIG welding operations requiring reliable current transfer and extended service life.

This contact tip is rated for use with 200 to 400 amp Tweco No. 2, No. 3, and No. 4 MIG guns, as well as compatible MIG gun series in that amperage range. It suits heavy-duty production welding environments where tip longevity and consistent arc quality are priorities. The twist-lock design engages the gas diffuser without loose threading, and the tip accepts both slip-on and thread-on nozzle styles, making it adaptable across common gun configurations found in fabrication and manufacturing shops.

Key Features

• 0.045-inch wire diameter, 0.054-inch nominal bore ID with plus or minus 0.003-inch tolerance
• Machined from 122 DHP copper alloy for consistent inside diameter surface and strong electrical conductivity
• Twist-lock design locks tip in place against the gas diffuser, increasing surface contact area and conductivity
• Thick-walled construction acts as a heat sink, drawing heat away from the arc source
• Quarter-turn clockwise rotation reveals a new wear point, effectively doubling usable tip life
• Part number and wire diameter marked on each tip for easy field identification
• Sold as 25 per pack

Compatibility

Rated for use with 200 to 400 amp Tweco No. 2, No. 3, and No. 4 MIG guns and compatible MIG gun series. Accepts slip-on or thread-on nozzle styles.

Installation Notes

Contact tip replacement is performed by a qualified welder or welding technician. Power down the welder and allow the gun to cool before removing the worn tip. Thread the 1140-1204 into the gas diffuser hand-tight and engage the twist-lock by rotating clockwise until seated. Inspect the nozzle and diffuser for spatter buildup before reinstalling to maintain proper gas shielding and electrical contact.

Technical Specifications

• Wire Diameter: 0.045 inches
• Bore ID: 0.054 inches nominal
• Outer Diameter: 0.283 inches
• Length: 1.47 inches
• Thread Size: 1/4-28 UNF-2A
• Current Rating: 400 amps maximum
• Material: 122 DHP copper alloy
• ID Tolerance: plus or minus 0.003 inches
• Pack Quantity: 25 each
• Weight: 0.03 pounds

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1140-1204