6290-3NX - Harris Style 6290-3NX Propane Cutting Tip Size 3

Technical Overview of the 6290-3NX Cutting Tip

The Techniweld 6290-3NX is a high-quality, aftermarket replacement cutting tip designed to be fully compatible with Harris-style oxy-fuel cutting equipment. This specific model is a Size #3 tip, engineered for use with alternative fuel gases such as Propane and Natural Gas. Unlike acetylene tips, which are typically one-piece, the 6290NX series utilizes a two-piece construction consisting of an outer shell and an inner member. This design is critical for alternative fuels, which have a slower flame propagation rate than acetylene; the recess created by the outer shell acts as a combustion chamber to anchor the flame and prevent it from blowing off the tip end during operation.

The Size #3 classification indicates a cutting capacity of approximately 3 inches (75mm) of mild steel. To achieve optimal performance, the recommended oxygen pressure is typically between 45 and 50 PSI, while the fuel gas pressure should be maintained between 5 and 15 PSI. The tip features precision-machined splines on the inner member to ensure consistent gas flow and a stable preheat flame. The outer shell is manufactured from durable copper alloy to withstand high reflected heat, while the inner member is brass, providing a robust seal against the torch head.

This tip is compatible with a wide range of Harris torches, including the popular 62-3, 73-3, and 142 series hand torches, as well as compatible machine torches. The 'Import Econo' designation signifies that this product provides a cost-effective alternative to OEM consumables without sacrificing essential performance characteristics required for industrial cutting applications.

Specifications and Usage

• Series: 6290NX (Propane/Natural Gas)
• Size: #3
• Cutting Thickness: ~3 inches
• Construction: 2-Piece (Brass Inner, Copper Outer)
• Seat Type: Harris Style Flat Seat