The Fireball Tool Mega Square is a game-changing welding and fabrication square designed to replace inaccurate speed squares and unstable shop-made jigs. Available in a 20",12", 8", 6" & 4" sizes , it is offered in two professional-grade variants: Cast Iron with a proprietary Dragon Scale coating and Cast Aluminum. Both models feature a rigid flange-and-web design with edge-machined 90° and 45° surfaces and 1/4-20 tapped holes for tool-free alignment tabs. This allows fabricators to achieve perfect, repeatable fit-ups and open-joint weld clearance without needing a thousand-dollar fixture table.
All 12", 10" & 8" Squares MADE IN USA
-Patented Design
Ultimate Joint Weld Clearance
Open 90-degree insets and deep corner reliefs give welding torches unhindered access to execute crucial tack welds on inside or outside corners.
Threaded Holes & Alignment Tabs
Built-in 1/4-20 (6.35 mm) tapped holes on both sides support thumbscrew alignment tabs to create a reference shelf that aligns parts and prevents twisting.
Cast Iron + Dragon Scale Variant
The cast iron option resists warping under heavy clamping. Its proprietary Dragon Scale coating repels weld spatter without anti-spatter sprays.
V-Block Functionality for Tubing
The unique inner web lets you cradle round pipes like a heavy-duty V-block. You can easily clamp tubing down for flawless perpendicular welds.
Huge Setup Time Savings
Replacing slow manual jigs with this square turns a day of tedious fit-up into a 15-minute task, easily paying for itself in shop labor savings.
Cast Aluminum Mobile Variant
The lightweight aluminum variant is ideal for mobile fieldwork. It acts as a massive heat sink for thin metals and remains completely rust-proof.
Unmatched Manufacturing Quality
Machined flat to tight tolerances, these squares beat standard hardware speed squares. The 8, 10, and 12-inch models are proudly made in the USA.
Multi-Angle Fixturing Versatility
Intelligent edge geometry enables rapid 45° and 135° setups. Add edge alignment pins to set up precise parallel, 30°, or 60° angles repeatedly.
Available Sizes
| Aluminum (AL) |
| Pros ✔ Lightweight; ideal for mobile welding setups. Cons ✖ Not suited for heavy loads or frequent impacts ✖ Can dent or deform if dropped. |
| Cast Iron + Dragon Scale |
| Pros ✔ Built for heavy-duty projects. Cons ✖ Heavy; not ideal for mobile welding) ✖ Susceptible to rust. |
What Is Dragon Scale Coating?
Superior Anti-Spatter Properties
Improved Corrosion Resistance
Enhanced Wear Resistance
Steel vs Dragon Scale Coating
Nitride vs Dragon Scale Coating
Full Video (Dragon Scale Demo)
Included Accessories
Our innovative tabs make welding tables optional.
- Align perfectly in seconds
- Skip the $1,000+ flat table
- Tabs attach front or back
We reinvented the game—just twist and go. No more hunting for the right tool!
- No hex keys or Allen wrenches
- Adjust tabs with just your fingers
- Quick changes, no tools needed
Optional Add-Ons
Snap on edge alignment pins to any square and get a handy overhang for lining up on different surfaces. Depending on the square, you can set it to 90°, 45°, parallel, or even 60° and 30° angles.
- Pair with Monster Squares to turn them into a speed square for quick layout work
- Mount off the edge of a table for vertical or perpendicular positioning
- Raise the square off the surface to add clearance while fitting or welding full frames
- Pro tip: Marking parallel lines? Pair with our shims for perfect spacing every time.
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