6290A-3 - Harris Style 6290-3 Acetylene Cutting Tip - 3 Inch Capacity

Technical Overview of the 6290A-3 Cutting Tip

The 6290A-3 is a precision-engineered cutting tip designed to be fully compatible with Harris-style oxy-fuel cutting torches. This specific model belongs to the widely utilized 6290 series, which is characterized by its flat seating surface, a distinct departure from the cone-style seats found in Victor or Airco compatible equipment. The "A" designation in the model number explicitly indicates that this tip is engineered for Acetylene gas. Acetylene requires specific internal geometry within the tip to manage its high flame velocity and temperature characteristics safely and efficiently; using this tip with alternative fuels like Propane or Propylene is not recommended and can lead to poor performance or safety hazards.

This Size 3 tip is calibrated for heavy-duty applications, boasting a cutting capacity of approximately 3 inches (75mm) of mild steel. The internal orifice sizing is machined to strict tolerances to ensure a stable, laminar oxygen stream, which is critical for maintaining a clean kerf through thick materials. The preheat arrangement is classified as "medium," meaning it provides a balanced thermal output suitable for clean to moderately rusty plate. This makes it an excellent general-purpose choice for fabrication shops where material conditions may vary.

Constructed from high-grade copper alloy, the 6290A-3 is designed to withstand the intense reflected heat generated during the cutting of thick sections. The outer shell facilitates rapid heat dissipation, protecting the internal gas passages from deformation. Proper maintenance of the flat seating surface is essential; users should ensure the torch head and tip face are free of carbon buildup or scratches to prevent leaks. When installing, hand-tighten the tip nut followed by a slight wrench turn to seat the flat surfaces effectively without over-torquing.

In industrial MRO contexts, standardization on the 6290 style allows for interchangeable inventory across various Harris-compatible torch handles and cutting attachments. This generic replacement part meets or exceeds standard operational parameters, providing a cost-effective solution for high-volume cutting operations requiring consistent 3-inch depth capabilities.