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oxyfuel cutting tip

The Complete Guide to Choosing the Right Oxy-Fuel Cutting Tip

From the team at Greco Gas - Your local industrial gas experts

Walk into any welding supply shop and ask for a cutting tip, and you'll quickly discover there's no such thing as "just a cutting tip." With dozens of sizes, styles, and specifications, choosing the wrong tip doesn't just waste money—it costs you time, gas, and quality cuts.

After decades of supplying industrial gases, welding supplies and gas apparatus equipment across Western Pennsylvania, we've seen every mistake in the book. This guide will help you choose the right tip the first time.

Understanding the Basics: What Makes a Cutting Tip Work

Before diving into selection, let's understand what's actually happening. An oxy-fuel cutting tip does two things:

  1. The preheat flame heats the metal to its kindling temperature (around 1,600°F)
  2. The high-pressure oxygen stream burns or rapidly oxidizes the metal and pushes away the oxide

This isn't melting—it's rapid oxidation. That's why you can't cut non-ferrous metals such as stainless steel or aluminum. But for ferrous metals (metals that contain iron) such as carbon steel, it's fast, portable, and economical.

The Numbering System: Decoding Tip Sizes

Most cutting tips use a numbering system, but here's what nobody tells you: there's no universal standard. A Victor #2 tip isn't the same as a Smith #2 tip.

Generally speaking:

  • Smaller numbers (000, 00, 0, 1, 2) = thinner material (1/8" to 1")
  • Larger numbers (3, 4, 5, 6+) = thicker material (1" to 6"+)

But always consult your torch manufacturer's chart. Each brand has specific recommendations for cutting oxygen pressure, preheat oxygen pressure, and fuel gas pressure for each tip size. Call or stop in our stores and  our counter staff will guide you through the process of selecting the correct tip for your torch and application.

Matching Tip to Material Thickness: The Critical Decision

Here's the honest truth: Most people use tips that are too small. It seems economical—smaller tips use less gas. But undersized tips mean:

  • Slower cutting speeds
  • Poor cut quality
  • Excessive tip wear
  • Frustration

A properly sized tip for your material thickness will actually save money through faster cuts and cleaner edges requiring less grinding.

General Guidelines (for acetylene):

  • 1/8" to 3/8" steel: Size 0 or 1
  • 1/2" to 3/4" steel: Size 2 or 3
  • 1" to 2" steel: Size 4 or 5
  • 2" to 4" steel: Size 6 or larger
  • Over 4" steel: Specialized heavy-duty tips

Fuel Gas Matters: Acetylene, Propane, or Propylene?

Your tip must match your fuel gas. They are not interchangeable.

Acetylene tips are most common. Acetylene burns hottest (5,800°F with oxygen), offering fast piercing and cutting speeds.

Propane tips have different orifice designs to compensate for propane's lower flame temperature. Propane is more economical and safer to store than acetylene, but cuts slower. Propane tips are often a two-piece tip. 

Propylene (MAPP) tips offer a middle ground—hotter than propane, safer than acetylene. It is increasingly popular for portable cutting rigs.

Never assume you can swap tips between fuel gases. The orifice size and preheat hole configuration are specifically engineered for each gas's combustion characteristics.

Reading the Signs: When to Replace Your Tip

Even quality tips wear out. Cutting generates enormous heat and oxidation right at the orifice. Replace your tip when you see:

  1. Uneven preheat flames - indicates clogged preheat holes
  2. Poor cut quality - raggedy edges, excessive slag
  3. Difficulty starting the cut - worn cutting oxygen orifice
  4. Flashbacks - damaged seat or tip body
  5. Visible damage - gouges, cracks, or deformation

Don't try to save money with worn tips. The cost of ruined material far exceeds the $15-40 for a new tip.

Common Mistakes We See (And How to Avoid Them)

Mistake #1: Using the wrong pressure Every tip has specific pressure requirements. Using the chart that came with your torch isn't optional—it's essential. Too much pressure wastes gas and damages tips. Too little gives poor cuts.

Mistake #2: Ignoring fuel gas type - "Tips are tips, right?" Wrong. Match tip to fuel or you're fighting the physics.

Mistake #3: Never cleaning tips - Keep a tip cleaner kit handy. Spatter and slag clog preheat holes. Clean regularly, but never enlarge orifices with reamers. – We stock an array of tip cleaners in all our branches.

Mistake #4: Cutting beyond the tip's range - If you're struggling to cut 2" plate with a #2 tip, you don't need better technique—you need a bigger tip. Work within the tip's design capacity.

Practical Selection Process

Here's how to choose the right tip:

  1. Identify your material thickness range - What do you cut most often?
  2. Check your fuel gas type - Acetylene, propane, or propylene?
  3. Note your torch brand - Airco, Harris, Oxweld, Purox, Smith, Victor, etc. 
  4. Consult the manufacturer's chart - Match thickness to recommended tip size
  5. Buy quality - Cheap offshore tips rarely match OEM specifications

The Bottom Line

The "right” cutting tip is the one properly matched to your material thickness, fuel gas, and torch brand. There's no universal tip, no magic solution—just proper matching based on engineering specifications.

Need help selecting tips for your specific application? We stock a complete range of cutting tips for all major torch brands at our locations in Tarentum, Butler, and Kittanning. Bring in your torch or give us the details—we'll help you select exactly what you need, along with the proper gases and pressures to run them.

Because at Greco Gas, we're not just selling tips. We're helping you make better cuts.

Visit Greco Gas:

Serving Pittsburgh and Southwestern Pennsylvania with industrial gases, welding supplies, and expertise since 1941