Tweco 1150-1255 Flux-cored Contact Tip 0.052 in 25 Pack

Product Description

The TWECO 1150-1255 is a heavy-duty flux-cored contact tip engineered for high-amperage MIG welding. It accommodates 0.052-inch wire and features a 0.064-inch nominal bore ID with a 0.345-inch OD. The tip is machined from extruded or gun-drilled 122 DHP copper alloy tubing, delivering a consistent, smooth inside diameter surface held to a tolerance of plus or minus 0.003 inches. At 1.59 inches in length and threaded with a 5/16-18 UNC-2A thread, it seats securely against a gas diffuser and is rated for welding applications up to 500 amps. Sold in a pack of 25.

This contact tip is designed for use with 200-500 amp Tweco No. 5 MIG guns and compatible MIG gun series operating in heavy-duty flux-cored welding environments. The thick-walled copper construction acts as a heat sink, drawing heat away from the arc source during sustained high-amperage operation. The twist-lock design locks the tip in place on the diffuser without relying on threads for electrical contact, increasing the conductive surface area between the tip and diffuser. When the initial wear point is reached, a quarter turn clockwise exposes a new wear surface, effectively doubling the service life of each tip. Each tip is marked with the part number and wire diameter for fast identification in multi-wire shops.

Key Features

• Rated for welding applications up to 500 amps
• 0.064-inch nominal bore ID with plus or minus 0.003-inch tolerance for consistent wire feed
• Machined from 122 DHP copper alloy for excellent electrical conductivity and heat dissipation
• Twist-lock design increases conductive surface contact with gas diffuser
• Quarter-turn clockwise reveals a second wear point, doubling tip service life
• Each tip marked with part number and wire diameter for easy identification
• Compatible with slip-on or thread-on nozzle styles

Compatibility

Designed for use with Tweco No. 5 MIG guns rated 200-500 amps and compatible Tweco MIG gun series that accept 5/16-18 UNC-2A threaded contact tips with 0.052-inch wire.

Installation Notes

Contact tip installation and replacement is performed by a qualified welding technician. Power down and disconnect the MIG gun from the welder before replacing the contact tip. Ensure the gas diffuser threads are clean before seating the tip; damaged diffuser threads will prevent proper electrical contact. Do not overtighten — seat the tip firmly and verify the twist-lock engagement before resuming welding.

Technical Specifications

• Wire Diameter: 0.052 inches
• Bore ID (Nominal): 0.064 inches
• OD: 0.345 inches
• Length: 1.59 inches
• Thread Size: 5/16-18 UNC-2A
• Maximum Current Rating: 500 amps
• Material: 122 DHP Copper Alloy
• ID Tolerance: plus or minus 0.003 inches
• Weight: 0.04 pounds
• Quantity per Pack: 25

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1150-1255