6290A-4 - Harris Style 6290 Acetylene Cutting Tip - Size 4 (6-Inch Capacity)

Precision Heavy-Duty Cutting for Industrial Applications

The Harris Style 6290A-4 Cutting Tip is a premium-quality replacement consumable designed for heavy industrial oxy-acetylene cutting operations. Engineered to meet the rigorous demands of structural steel fabrication, shipyards, and heavy equipment repair, this Size 4 tip provides the thermal dynamics necessary to sever carbon steel plates up to 6 inches (150mm) thick. By utilizing a one-piece copper construction, the tip ensures maximum thermal conductivity, preventing overheating during prolonged cuts while maintaining a stable preheat flame.

This specific model features a medium preheat hole pattern. Medium preheat is the industry standard for general-purpose cutting, offering a balanced flame that provides sufficient heat to start cuts rapidly on clean or slightly oxidized surfaces without consuming excessive fuel gas. The internal geometry of the oxygen passage is precision-drilled and swaged to maintain a laminar oxygen stream, which is critical for achieving clean, square cut faces with minimal slag accumulation at the bottom edge. This reduces the need for secondary grinding and machining, optimizing workflow efficiency in high-volume production environments.

Compatibility is key in mixed-equipment workshops. The 6290A-4 is manufactured to exact dimensional tolerances to fit all standard Harris-style torches and cutting attachments. The seating surface is machined to ensure a metal-to-metal gas-tight seal, mitigating the risks of flashbacks and leaks commonly associated with inferior aftermarket consumables. Whether you are processing heavy scrap or profiling thick structural beams, this tip delivers consistent performance and reliability.

Technical Specifications & Usage

For optimal performance, operators should ensure their regulators are set to accommodate the higher flow rates required by a Size 4 tip. Acetylene pressures should be maintained within safe operating limits (never exceeding 15 PSI), while oxygen pressure must be increased significantly compared to smaller tips to punch through 6-inch material effectively. Regular maintenance with a proper tip cleaner is recommended to keep the preheat orifices and cutting jet free from carbon buildup and spatter.