Tweco 1550-1100 Mig Gas Diffuser 1.375 in 500A

Product Description

The TWECO 1550-1100 is a standard-duty brass gas diffuser designed for use with slip-on nozzle assemblies and 500A MIG welding guns. Machined from 145 tellurium copper alloy bar stock, this diffuser delivers consistent dimensional stability and reliable electrical conductivity across medium to heavy-duty welding applications. It measures 1.375 inches in overall length and features six 0.094-inch gas holes that promote even shielding gas distribution across the weld zone. A 7/16-inch-20UNF-2A thread size matches the corresponding conductor tube on compatible MIG guns. The part number is roll-stamped on the external surface for quick identification in the field. Sold as 5 per pack.

This gas diffuser is suited for medium to heavy-duty MIG welding applications rated up to 500A. It is compatible with Tweco No. 3 and No. 4 MIG gun series that use slip-on nozzle assemblies, as well as Tweco Eliminator front-end consumables. The diffuser accommodates a conduit liner via a built-in conduit set screw, making it a practical replacement component in production welding environments and job-site MIG setups where consistent gas coverage and electrical performance are required.

Key Features

• Machined from 145 tellurium copper alloy bar stock for consistent dimensional stability and electrical conductivity
• Six 0.094-inch gas holes provide even shielding gas distribution at the weld zone
• 7/16-inch-20UNF-2A thread mates with conductor tube on compatible MIG gun series
• Conduit set screw holds the conduit liner securely in position
• Part number roll-stamped on external surface for fast identification during consumable changeouts
• Rated for welding applications up to 500A for medium to heavy-duty use

Compatibility

Compatible with Tweco No. 3 and No. 4 MIG gun series using slip-on nozzle assemblies, and with Tweco Eliminator front-end consumable systems.

Installation Notes

Gas diffuser replacement is a standard consumable service task performed by certified welders or MIG gun technicians. Power down and de-energize the welding system completely before replacing front-end consumables. Thread the diffuser onto the conductor tube by hand first, then snug to the specified conductor tube interface to avoid cross-threading. Ensure the conduit liner is seated and secured by the conduit set screw before resuming operation.

Technical Specifications

• Overall Length: 1.375 inches
• Thread Size: 7/16 inch-20UNF-2A
• Gas Hole Size: 0.094 inches (6 holes)
• Current Rating: 500A
• Material: 145 Tellurium Copper Alloy
• Weight: 0.05 pounds
• Package Quantity: 5 per pack
• UPC: 608246079998

Standard Information

• Brand: TWECO
• Manufacturer Part Number: 1550-1100