Tri-Square (3-in-1 Pipe Fitting Square)

Tri-Square (3-in-1 Pipe Fitting Square)


Forget about fumbling around with 2 squares and a tape measure, our tool makes your life so much easier! This tool assists with the squaring of a 45° fitting, 90° fitting, and a flange. 

Our 3-in-1 pipe fitting square is a great all-round square that can also be used for flanges. If you need something a little more portable and you’re working with smaller pipes, our 2-in-1 pipe fitting square is also a great choice.

  • Made from 3/16” USA aluminum
  • Quality built in Central Arkansas
  • Laser cut for precision
  • 45°, 90°, flanges


***Blemishes are expected on the material the squares are cut from. Small nicks/scratches may be present on the finished product.***


Product details

This 3-in-1 pipe fitting square simplifies the squaring process for 45° and 90° fittings, as well as flanges. Enjoy the convenience of an all-in-one solution that eliminates the need for multiple tools.

Choose from various size options to suit your specific needs and pipe dimensions:

Small: 14” x 10”

  • Up to 6” pipe
  • Up to 4” flanges


Large: 24” x 17”

  • Up to 10” pipe
  • Up to 8” flanges


U.S. Patent No. D987,449

Note: H&K Fabrication owns all rights to this design and production of this product.

Frequently Asked Questions

FAQ – TRI-SQUARE (3-in-1 Pipe Fitting Square)

Does the 3-in-1 Pipe Fitting Square come with a warranty?

Yes, the3-in-1 Pipe Fitting Square is backed by a 1-year warranty. If you encounter any issues during this time, reach out to us for assistance.

How does the 3-in-1 Pipe Fitting Square compare to the 2-in-1 Sqaure?

The 3-in-1 Pipe Fitting Square is versatile, handling 45° and 90° fittings as well as flanges. On the other hand, the 2-in-1 square focuses on 45° and 90° fittings only and is smaller and more portable. For larger pipes or when flanges are involved, opt for the 3-in-1 Pipe Fitting Square.


15 reviews for Tri-Square (3-in-1 Pipe Fitting Square)

  1. Caolan Kinsella (verified owner)

    Excellent quality tool making my job easier at a great price and well protected during shipping recommended to all pipefitters out there

  2. Marino


  3. Renae Pierrard (verified owner)

    Do you have instructions for how to use this square. For what we need I think it will work great but I think we can use it in many ways we’re not aware of

  4. Miguel Rosas

    Good fitting tools

  5. Curtis Barnett (verified owner)

    Great product,makes fitting up flanges 90and 45 degree piping fast and accurate !

  6. Perfecto mondero (verified owner)

    10 points

  7. Curtis Barnett (verified owner)

    American made quality,makes my job alot easier .

  8. JB (verified owner)

    Handy as a pocket on a shirt. Well made, great price

  9. Nathan (verified owner)

    Best square out there hands down easy to use

  10. Pedro Madera (verified owner)

    Good tools

  11. Cameron Norris

    Love my tri square, huge improvement on productivity

  12. Beto P (Brailosky)

    Hi,It was a pleasure doing business with H & K their communication tracking information was great from beginning to end and their product its quality made it worth the money. I definitely recommend buying the 3 in 1 Pipefitter square from them you will not regret. Thanks H&K.

  13. David cutchin (verified owner)

    Great square! Makes fast work of 90’s and flanges!

  14. Gary S (verified owner)

    I bought both sizes, perfect for what I need since I work in the T/A industry. Their product made it to my house on time and good quality.

  15. Justin Hess (verified owner)

    This is a great tool, it works exactly as it’s supposed to.
    So far the only problem is that I don’t have the large one yet!

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