Tweco 1140-1103 Mig Contact Tip 0.040 Inch 25 Pack

Product Description

The TWECO 1140-1103 is a 14 Series standard-duty MIG contact tip designed for wire feeders running 0.040-inch diameter wire. Built from extruded or gun-drilled 122 DHP copper alloy and machined from copper alloy tubing, it delivers consistent inside diameter surface finish held to a tolerance of plus or minus 0.003 inches. At 1.5 inches in length with a 1/4-28 UNF-2A threaded connection, a 0.054-inch nominal ID, and a 0.25-inch OD, this tip threads directly onto compatible gas diffusers for solid electrical contact. Licensed welding professionals and MIG gun technicians install these tips as part of routine gun maintenance on high-cycle production and fabrication equipment. Sold in packs of 25.

This contact tip is rated for standard welding applications up to 400 amps, making it appropriate for use on 200 to 400 amp MIG guns. The thick-walled copper alloy construction acts as a heat sink, drawing heat away from the arc source during sustained welding cycles. The tip is stamped with the part number and wire diameter for fast identification when swapping consumables on the floor. The twist-lock design seats the tip securely against the gas diffuser without relying on threads to maintain position, increasing the electrical conductive surface area between tip and diffuser. When the initial wear point is reached, a quarter-turn clockwise rotation exposes a fresh contact surface, effectively doubling the service life of each tip.

Key Features

• Rated for standard MIG welding applications up to 400 amps
• 122 DHP copper alloy construction provides high electrical conductivity and heat dissipation
• Inside diameter held to plus or minus 0.003-inch tolerance for consistent wire feed
• 1/4-28 UNF-2A thread size for secure diffuser engagement
• Twist-lock design increases contact surface area between tip and diffuser
• Rotatable tip exposes a second wear point, doubling usable tip life
• Part number and wire diameter marked on each tip for quick field identification

Compatibility

Designed for use with 200 to 400 amp Tweco No. 2, No. 3, and No. 4 MIG guns, as well as compatible MIG gun series that accept a 1/4-28 UNF-2A threaded contact tip with slip-on or thread-on nozzle styles.

Installation Notes

Contact tip replacement is performed by qualified welding equipment technicians or trained MIG gun operators. Always power down the welder and allow the gun to cool before removing or installing contact tips. Ensure the gas diffuser threads are clean and undamaged before threading the new tip into place. Follow the gun manufacturer's service documentation for torque and seating procedures specific to the gun model in use.

Technical Specifications

• Wire Diameter: 0.040 inches
• Nominal Inside Diameter: 0.054 inches
• Outside Diameter: 0.25 inches
• Tip Length: 1.5 inches
• Thread Size: 1/4-28 UNF-2A
• Amperage Rating: up to 400 amps
• Material: 122 DHP copper alloy
• ID Tolerance: plus or minus 0.003 inches
• Pack Quantity: 25
• Weight: 0.02 pounds

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1140-1103