This Tweco 1210-1120 Fabricator 140/180/190 21-62 MIG Nozzle is used in light to medium duty welding applications up to 180 amperes. The 3-piece nozzle design includes: Nozzle Housing - Cut and Formed from 122 DHP copper alloy tubing Nozzle Insert - machined from a solid brass alloy and machining the internal threads to match the gas diffuser Nozzle insulator - made from G7 silicone material providing the electrical insulation needed from the gas diffuser Features and Specifications: Easy identification - Part number is rolled stamped on the outside surface 3-piece design - does not require an additional insulator Nozzle threads onto the gas diffuser Processes: GMAW - Air-cooled Contact Tip Relationship: Recess - 0.125 (3.17mm) to 0.156 (3.96mm) Use with Standard Gas Diffuser: Part No. 51 (Stock No. 1510-1101) Part No. 51-23 (Stock No. 1510-1100) Material: 122 DHP Copper Alloy Outside Diameter: 0.750 (19.5mm) Thread Size: M11-1.5-6H Overall Length: 2.224 (56.49mm) Bore Size: 0.625 (15.9mm).