Aviation shears—often called tin snips—are one of the most useful hand tools for cutting sheet metal, flashing, ductwork, and even some plastics. If you’ve ever struggled with jagged edges, bent metal, or hand fatigue, chances are you weren’t using the right technique—or the right pair of shears.
In this guide, you’ll learn how to use aviation shears properly, what the different colors mean, and how to get clean, accurate cuts every time.
What Are Aviation Shears?
Aviation shears are compound-leverage cutting tools designed to slice through thin metal with minimal effort. Despite the name, they’re not just for aircraft work—plumbers, HVAC techs, roofers, and DIYers rely on them daily.
They’re ideal for cutting:
- Sheet metal
- Aluminum flashing
- Galvanized steel
- Vinyl siding
- Wire mesh
- Thin plastics
👉 Tip: If you’re working on ducting or flashing, aviation shears are far safer and more precise than a cutoff wheel.
Understanding Aviation Shear Colors (This Matters)
Aviation shears are color-coded to indicate the direction they cut best:
🔴 Red-Handled Shears – Left Cuts
- Best for cutting curves to the left
- Also useful for straight cuts with the waste curling left
🟢 Green-Handled Shears – Right Cuts
- Best for cutting curves to the right
- Keeps the waste material out of your way
🟡 Yellow-Handled Shears – Straight Cuts
- Designed for straight lines
- Can handle gentle curves in either direction
Pro Tip: Many pros keep all three on hand. Switching shears is faster—and cleaner—than forcing a cut.
Hurricane Aviation 3-Piece Aviation Tin Snip Set
How to Use Aviation Shears Step by Step
1. Mark Your Cut Line Clearly
Use a permanent marker or scribe to mark your cut. Aviation shears follow lines well, but only if you can see them.
2. Choose the Correct Shears
Match the shear color to your cut direction. Using the wrong shear causes metal to bind and warp.
3. Start with Short Cuts
Don’t try to cut the full blade length at once. Use short, controlled bites—this improves accuracy and reduces hand strain.
4. Keep the Metal Supported
Let the waste piece curl away naturally. Don’t fight it. If the metal bends upward, pause and reposition the shears.
5. Maintain a Neutral Wrist Position
Aviation shears are designed to do the work for you. If your wrist hurts, you’re forcing the cut or using dull blades.
Common Mistakes to Avoid
❌ Using straight shears for tight curves
❌ Cutting material that’s too thick
❌ Twisting the tool mid-cut
❌ Ignoring sharp edges (always wear gloves)
How Thick Can Aviation Shears Cut?
Most quality aviation shears can handle:
- Up to 18-gauge mild steel
- Up to 22-gauge stainless steel
- Thicker aluminum and copper
Always check the manufacturer’s rating before cutting heavier material.
Check out these 10-Inch Heavy-Duty Aviation Shears
Aviation Shears vs Tin Snips: What’s the Difference?
While the terms are often used interchangeably, aviation shears are technically a type of tin snips—but with compound leverage. This means:
- Less hand effort
- Cleaner cuts
- Better control on curves
If you’re still using old-style straight tin snips, upgrading to aviation shears is a noticeable improvement.
How to Care for Aviation Shears
- Wipe blades clean after use
- Lightly oil the pivot joint
- Don’t cut wire or hardened steel
- Store with the safety latch engaged
A well-maintained pair can last for years.
Are Aviation Shears Worth It?
Absolutely. For DIYers, homeowners, and professionals alike, aviation shears are:
- Affordable
- Versatile
- Safer than power tools for thin metal
If you do any metal cutting at home, this is a tool you’ll reach for again and again.
Recommended Aviation Shears
Look for:
- Forged steel blades
- Ergonomic grips
- Compound leverage
- Left, right, and straight options
👉 Check current prices and reviews on Amazon here:
Hurricane 3-Piece Aviation Tin Snips
Final Thoughts
Learning how to use aviation shears properly saves time, improves accuracy, and prevents injuries. With the right technique—and the right pair—you’ll get professional-quality cuts without breaking a sweat.
If you’re building a basic home tool kit, aviation shears deserve a permanent spot.
Related Posts
Please note: do not use these tools if you are not certain that you can use them safely, or if it the information doesn’t seem accurate. Skippity Whistles provides this information as advice, and cannot accept any liability for your usage of it.
Skippity Whistles 