Tweco 1150-1259 Heavy Duty Contact Tip 5/64 in 500A 25 Pack

Product Description

The TWECO 1150-1259 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 consistent electrical conductivity and a smooth inside diameter with a tolerance of plus or minus 0.003 inches. The tip measures 1.59 inches in length with a 0.090-inch nominal bore ID, a 0.345-inch OD, and a 0.3125-24 UNF thread size. It accommodates 5/64-inch diameter welding wire and is sized for use with 200 to 500 amp MIG guns. Licensed welding technicians and professional fabricators specify this tip for demanding, continuous-duty welding operations.

This contact tip is suited for heavy industrial and commercial welding environments where high amperage and extended duty cycles are the norm. It is compatible with 200 to 500 amp Tweco No. 5 MIG guns and specific Tweco MIG gun series. The thick-walled copper alloy construction acts as a heat sink, conducting heat away from the arc source during sustained high-current operation. The tip ships 25 units per pack, making it practical for service shops and field crews that need to maintain adequate consumable inventory.

Key Features

• Rated for welding applications up to 500 amps with 5/64-inch wire
• Machined from 122 DHP copper alloy for consistent, smooth bore with plus or minus 0.003-inch ID tolerance
• Threaded style with 0.3125-24 UNF thread ensures proper contact with gas diffuser
• Twist-lock design locks in place and increases electrical conductive surface area between tip and diffuser
• Quarter-turn clockwise rotation reveals a new wear point, effectively doubling tip service life
• Thick-walled design acts as a heat sink, drawing heat away from the arc
• Each tip is marked with part number and wire diameter for fast identification

Compatibility

Compatible with 200 to 500 amp Tweco No. 5 MIG guns and specific Tweco MIG gun series. Accepts slip-on or thread-on nozzle styles.

Installation Notes

Contact tip replacement is performed by qualified welding technicians or MIG gun service personnel. Power down and de-energize the welding system completely before replacing consumables. Ensure the thread engagement is secure so the tip seats properly against the gas diffuser for correct electrical contact. Do not overtighten, as this can distort the tip or damage diffuser threads.

Technical Specifications

• Wire Diameter: 5/64 inches
• Bore ID: 0.090 inches nominal
• Outer Diameter: 0.345 inches
• Tip Length: 1.59 inches
• Thread Size: 0.3125-24 UNF
• Maximum Amperage: 500 amps
• ID Tolerance: plus or minus 0.003 inches
• Material: 122 DHP copper alloy
• Package Quantity: 25 per pack
• Weight: 0.04 pounds
• Dimensions: 0.3 inches x 0.3 inches x 1.6 inches
• UOM: Each

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1150-1259