Technical Foundation
What Is a Cutting Torche?
An oxy-fuel cutting torch mixes a fuel gas (acetylene, propane, propylene or natural gas) with oxygen to preheat steel to its kindling temperature, then releases a separate high-pressure oxygen jet through the tip's center orifice to oxidize and blow away the metal along the cut line — it's a chemical cutting process, not melting, which is why oxy-fuel cutting works well on carbon steel but not on stainless steel, aluminum or other alloys that form a refractory oxide layer resisting the process.
Cutting tip selection, not torch body, determines cutting capacity — each tip size is rated for a specific plate thickness range and matched oxygen/fuel flow rate, with preheat orifice count and size varying by fuel gas type (acetylene tips differ from propane tips even at the same nominal size, since propane burns at a different flame temperature and requires different preheat geometry). Acetylene remains the standard fuel for its high flame temperature and fast preheat, while propane and propylene offer lower cost and are preferred for heavy plate where preheat time matters less than gas cost.
Prefer a quick quote?
Get Cutting Torches Pricing in Your Inbox
Skip the search — tell us the fuel gas type, plate thickness to cut and hand vs. machine torch and we will come back with pricing.
| Spec | What It Means | Why It Matters |
|---|---|---|
| Fuel Gas Type | Acetylene, propane, propylene, natural gas | Each fuel has a different flame temperature and requires tips designed specifically for that gas |
| Cutting Tip Size | Numbered/lettered tip sized to plate thickness range | Tip orifice size and preheat hole count — not torch body — set actual cutting capacity |
| Cutting Capacity | Plate thickness range, e.g., 1/8 in to 12 in+ | Must match your typical material thickness; using an undersized tip on thick plate slows cutting and wastes gas |
| Torch Type | Hand-held vs. machine/CNC mounted | Machine torches mount rigidly for straight-line and shape cutting with consistent standoff and speed |
| Gas Pressure Settings | Oxygen and fuel pressure per tip manufacturer chart | Incorrect pressure for the tip size causes poor preheat, backfire risk or poor cut quality |
Shop Cutting Torches
Browse Cutting Torches Sub-Categories
Organised by fuel gas and application. Pick a sub-category, or tell ChatMRO the plate thickness and fuel gas you're cutting with.
How it works
From Half-Remembered Part Number to PO, in Three Steps.
Ask
Type an MPN, paste a spec sheet, or describe the part in plain English. ChatMRO understands engineer-speak.
Compare
Side-by-side specs, cross-references, and equivalents from multiple sources — without the clutter of endless browser tabs.
Quote & Buy
Request a quote or add to cart. Volume discounts, VAT-aware pricing, and consolidated procurement — all in one place.
Applications
Where Cutting Torches Get Used
Cutting torches are specified wherever carbon steel needs to be cut, beveled or pierced using oxy-fuel rather than plasma or mechanical cutting methods.
Structural Steel Fabrication
Hand cutting torches for field cutting and beveling structural steel plate and shapes.
Shipbuilding & Heavy Plate Fabrication
Machine-mounted cutting torches following CNC-guided patterns on thick steel plate.
Scrap Metal Processing & Demolition
Heavy-duty hand torches cutting through thick, often rusted or coated steel sections.
Pipeline & Pipe Fabrication
Cutting torches beveling pipe ends for welding preparation in the field and shop.
Construction & Renovation
Hand torches for cutting structural steel, rebar and metal components during demolition and rework.
Metal Recycling Yards
High-capacity torches for rapid sectioning of large steel structures and equipment.
FAQ
Cutting Torches Questions, Answered
Why won't a cutting torch cut stainless steel or aluminum?
Oxy-fuel cutting works by burning (oxidizing) iron in the presence of a preheat flame and an oxygen jet, and the resulting iron oxide has a lower melting point than the base steel, letting it blow clear of the cut. Stainless steel's chromium content and aluminum's natural oxide layer both form a refractory oxide that doesn't melt or blow away the same way, effectively choking the cut — these materials require plasma cutting instead.
How do I choose the right cutting tip for my plate thickness?
Each tip manufacturer publishes a chart matching tip number/size to a plate thickness range along with the recommended oxygen and fuel gas pressures for that tip — an undersized tip on thick plate will cut too slowly and may not fully penetrate, while an oversized tip on thin plate wastes gas and can produce a rough, wide kerf. Always set pressures per the specific tip's chart, not a generic setting.
What's the difference between using acetylene vs. propane as the fuel gas?
Acetylene burns hotter and preheats steel faster, making it the standard choice for general fabrication and where cut speed matters. Propane (and similarly propylene) burns cooler and needs more preheat orifices and slightly longer preheat time, but it's generally less expensive and safer to store and transport in larger volumes, making it common for heavy plate cutting in shipyards and scrap yards where gas consumption is high.
What causes a torch to backfire or flashback, and how do I prevent it?
A backfire (a loud pop where the flame momentarily goes out at the tip) is often caused by the tip touching the work, overheating, or incorrect gas pressure, and it's usually harmless if the flame doesn't reignite. A flashback (flame burning back into the torch or hose) is more dangerous and is prevented primarily by installing flashback arrestors on both the oxygen and fuel gas lines at the regulator and/or torch, along with maintaining correct pressures and tip condition.
How do I set the correct flame for cutting — neutral, carburizing or oxidizing?
A neutral flame (roughly equal oxygen and fuel with a well-defined, sharp inner cone) is standard for cutting most steel, giving clean preheat without excess carbon or oxygen affecting the cut edge. An oversupply of oxygen (oxidizing flame) burns the cut edge and wastes oxygen; too much fuel (carburizing flame) leaves a soft, sooty inner flame and slows preheat — adjust at the torch valves while watching the inner cone shape before starting the cut.
Keep browsing
Related Categories
Explore More
Find Your Next Part Now.
Describe a part number, spec or what it does.