Jumbo 20" Mutant Square
Jumbo 20" Mutant Square
Jumbo 20" Mutant Square
Jumbo 20" Mutant Square
Jumbo 20" Mutant Square
Jumbo 20" Mutant Square
Jumbo 20" Mutant Square
Jumbo 20" Mutant Square
Jumbo 20" Mutant Square
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Jumbo 20" Mutant SquareJumbo 20" Mutant SquareJumbo 20" Mutant SquareJumbo 20" Mutant SquareJumbo 20" Mutant SquareJumbo 20" Mutant SquareJumbo 20" Mutant SquareJumbo 20" Mutant SquareJumbo 20" Mutant Square

Jumbo 20" Mutant Square

Fireball ToolSKU: F5-MUS020-AL-BDK
Material: Aluminum
Price:
$451.00 USD

JUMBO MUTANT SQUARE

The Jumbo 20" Mutant Square blends key features from both the Mega and Monster Squares. Think of it as a larger Minion Square, but with a 45-degree angle in place of the usual 60/30 configuration. Also, available in a 12", 10" and 8" sizes with two material choices: Cast Iron (FE) with Dragon Scale Coat or Cast Aluminum (AL)

- Includes both 90° corners and a cutaway corner for easy joint access-

- Ships with four thumbscrews and five tabs.

 - Patented Design

Two angles, one 90 degrees and one 45 degrees, with filmstrip graphics.

How the Pros Use It

Free up joints for welding—the included L-tab keeps parts secure while leaving the corner open.

Metal corner bracket with a highlighted joint on a gray surface.

Weld inside corners with ease—this square holds a true 90° angle and gives you clearance to access the joint.

Black welding square tool positioned on a metal work surface.

Hold parts square with ease—this tool keeps everything aligned for accurate setup and welding.

Close-up of a metal bracket attached to a steel frame.
Metal right angle square on a perforated work surface.

Pros Know the Right Size Matters

Mutant 20"

Size: 20" x 20" x 3"

Flange: 4"

Aluminum (AL)

Weight: 27.6 lb

(12.5kg)

Dragon Scale (FE)

Weight: 71.4 lb

(32.4 kg)

Mutant 12"

Size: 12" x 12" x 2"

Flange: 1.5"

Aluminum (AL)

Weight: xx lb

                 

Dragon Scale (FE)

Weight: 00 lb

(3 kg)

Mutant 10"

Size: 10" x 10" x 2"

Flange: 2"

Aluminum (AL)

Weight: 4lb (1.8kg)

 

Dragon Scale (FE)

Weight: 12 lb

(5.5 kg)

Mutant 8"

Size: 8" x 8" x 1.5"

Flange: 1.5"

Aluminum (AL)

Weight: 00      

 

Dragon Scale (FE)

Weight: 6.7 lb

(3kg)

All You Need to Know

Close-up of a metal component with a highlighted gap.

All Mutant Square
 C-channel beam with offset web for edge-friendly use.

Aluminum (AL)

Pros

✔ Lightweight; ideal for mobile welding setups.
✔ More resistant to warping than standard aluminum billet.
✔ Naturally offers light spatter resistance.

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.
✔ Extremely resistant to warping, dents, and burrs.
✔  Dragon Scale coating outperforms spatter sprays—no sprays needed.
✔ Corrosion-resistant upgrade from our previous black oxide finish

Cons

✖ Heavy; not ideal for mobile welding)

✖ Susceptible to rust.

 

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

Edge Alignment Pins

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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