CertiFlat 6" Corner Welding Square

Corner Square is a new product for CertiFlat. All Corner Square were designed from the ground up to provide years of helping you in your shop to build what you need. Currently available in our 6” option. Corner Squares make set ups and corner welding quick and easy.

All Corner Squares feature the following:

  • CNC Laser Cut for accuracy. +/- .003" is held throughout the manufacturing process
  • Ultra-Strong 1/4" Thick A36 HRPO Prime Steel
  • Fit 16MM and 5/8" Tooling Holes and Tables
  • Very accurate and square (if assembled correctly)

Our Corner Squares feature the same mounting pattern as our Certiflat tables along with all the accessories so you can use them how you need. These work great for building a corner with miters or 3 tubes with at least 3 sides to for access to weld. With our propriety tab and slot engineered design this will basically square themselves.


Guaranteed for life, Corner Squares are a tool you just can't live without. The perfect complement for your CertiFlat Table and Accessories.

Unless you are making arrangements to pick up your purchase, all items require shipping.

How much is it to ship?

  • Shipping is currently flat rate and it depends on the weight. All pro tables can ship UPS to your door for max $69.99.
  • FabBlocks MUST ship freight, that rate is $69.99 to a commercial address or terminal or $99.99 for a residential delivery with liftgate.
  • Depending on where you live, the largest block we can put on a liftgate is 4’x8’. Some areas are limited to 90” length.

Most certiflat items are very heavy. UPS has a weight limit of 150lbs.

  • Our pro table line, and 24x36/24x48 mini blocks can be split up and ship in multiple boxes via ups.
  • The 36x48 mini block and regular fabblocks need to ship freight due to number of parts and weight.
  • Fabblocks smaller than 60" can be delivered to a residential address with a liftgate, anything larger will either need to go to a shipping terminal for you to pick up, or delivered to a commercial address with a dock/forklift.

Home based businesses and farms do not qualify for commercial status even with a forklift.

  • We will be flagged with a residential delivery and residential delivery must be purchased when adding products to your shoppinng cart.
  • The flat rate shipping offers are to the lower 48 contiguous states.
  • We also ship to alaska, puerto rico, haiwiaii, canada & mexico, contact us for a quote.


  • Call or text us at 651.800.4877
  • Email us at admin@tabandslot.Com
Customer Reviews
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Filter Reviews:
    JOE C.
    United States

    Good tool

    EZ to assemble ,after welding I checked for square with a precision square. Spot on. I expect years of service.

    Steve C.
    United States United States

    Great product

    Assembling the piece was easy! The metal is very precisely cut and lock together square and true.

    Simon E.
    United States United States

    Very Handy

    Easy to put together. I used it to build the other CertiFlat items I bought, which are also excellent.

    Ronald R.
    United States United States

    Corner Welding Square

    I have yet to use it, but was very impressed with the precision fit-up and ease of welding it together - I'm sure it will come in very handy!

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    Need Help? Call Us at 651.800.4877