Tweco 1150-1254 Contact Tip 0.045 Inch Heavy Duty 500A

Product Description

The TWECO 1150-1254 is a heavy-duty flux-cored contact tip designed for high-amperage MIG welding applications up to 500 amps. Machined from extruded or gun-drilled 122 DHP copper alloy tubing, it delivers a consistent, smooth inside diameter with a tolerance of plus or minus 0.003 inches. The tip measures 1.59 inches in length with a 5/16 inch-18 UNC-2A thread and accepts 0.045 inch welding wire. Licensed welding technicians and MIG gun service professionals install this consumable as part of routine torch maintenance. Each tip is marked with the part number and wire diameter for fast, accurate identification on the job. Sold in a pack of 25.

This contact tip is engineered for use with 200 to 500 amp Tweco No. 5 MIG guns and compatible specific MIG gun series in the Tweco 15 Series lineup. It is suited for heavy-duty industrial and fabrication welding environments where sustained high-amperage output demands reliable electrical contact and thermal management. The thick-walled copper alloy construction acts as a heat sink, drawing heat away from the arc source during extended welds. The tip is available in slip-on or thread-on nozzle styles with multiple bore diameter options to match various wire sizes and gun configurations.

Key Features

• Accepts 0.045 inch wire with inside diameter tolerance held to plus or minus 0.003 inches for consistent wire feed
• Machined from 122 DHP copper alloy for excellent electrical conductivity and smooth bore surface
• Threaded style (5/16 inch-18 UNC-2A) ensures secure contact with gas diffuser when installed
• Twist-lock design locks tip in place without relying on threads; quarter-turn clockwise reveals a new wear point to double tip life
• Thick-walled design acts as a heat sink, conducting heat away from the arc source during high-amperage operation
• Each tip is marked with part number and wire diameter for quick field identification
• Sold as a pack of 25 tips

Compatibility

Designed for use with 200 to 500 amp Tweco No. 5 MIG guns and specific Tweco 15 Series MIG gun configurations. Compatible with slip-on or thread-on nozzle styles.

Installation Notes

Installation and replacement of contact tips is performed by qualified welding technicians or MIG gun service personnel. Power down and de-energize the welding system before replacing any consumables. Ensure the gas diffuser threads are clean and undamaged before threading the tip into place. Do not overtighten; the twist-lock feature secures the tip with proper seating against the diffuser.

Technical Specifications

• Wire Diameter: 0.045 inches
• Maximum Amperage: 500 amps
• Thread Size: 5/16 inch-18 UNC-2A
• Tip Length: 1.59 inches
• Inside Diameter Tolerance: plus or minus 0.003 inches
• Material: 122 DHP copper alloy
• Package Quantity: 25 per pack
• Package Weight: 0.04 pounds
• Package Length: 1.2 inches
• Package Width: 2.5 inches
• Package Height: 1.2 inches

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1150-1254