GO! Half Square Triangle-4 1/2" Finished Square

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Quick Overview

Two half square triangles sewn together form a 4 1/2" finished square. Triangles are a basic building block in quilting. Arrange triangles in colorful combinations for great quilt designs. Combine with GO!

Compatible with these fabric cutters:

*Must use with GO! Die Adapter

GO!® Half Square-4 1/2" Finished Triangle (55397)

Use this GO! Half Square Triangle-4 1/2" Finished Square die to cut multiple triangles at once. It's compatible with the GO!, GO! Baby, GO! Big, and Studio fabric cutters, and makes clean, accurate cuts every time. The triangles cut with this die can be arranged to create a bevy of designs and combinations.

Use GO! dies with your GO! and GO! Baby Fabric Cutters to cut precise, accurate shapes in just seconds.

Features and Benefits:

  • Cut so much more in less time—Cut up to 6 layers of 100% cotton fabric at once
  • Easiest to use—Simply place die on cutter, then fabric and cutting mat on top
  • Get accurate cuts every time—No slipping rulers or mistakes
  • Create quilts you never thought you would—AccuQuilt makes cutting curvy classic quilt patterns a snap
  • Save fabric with Two Tone Foam—Get more out of your fabric by placing it only over the shape you want to cut
  • Safe to use—No blades come anywhere near your fingers
  • No more math—Geometric shapes are designed with an accurate 1/4" seam allowance in the design
  • Quilt more, clip less—No more clipping all those dog-eared corners
  • Quick and easy applique—Apply fusible web to fabric prior to cutting

Storage: Organize GO! dies with AccuQuilt GO! Die Storage Rack (55115).

Care & Maintenance: Use adhesive roller to clean lint and thread from dies. After each use, with the die pick provided with the cutter, remove any threads imbedded between blades and foam. It's normal for threads to get caught where blades meet in a die. Remove with tweezers or die pick. Die blades never need to be sharpened.

Die Tips:

  • With some fabrics, after cutting, a thread or two will remain where die blades meet. Snip threads with scissors.
  • Use cutting mats that matches size of each die.
  • For best results, cut with die blades running under roller at an angle. Do not cut with blades parallel to roller.
  • Blades on some dies are positioned at an angle. Align fabric to edge of shape, not edge of die board.
  • Some dies feature specially designed corners to aid in alignment and pre-cutting.
  • For fast applique, apply fusible web to fabrics, then cut shapes with dies.
  • Use good quality fabric to reduce fabric stretch.
  • It's always a good idea to test cut one shape before cutting many shapes to ensure fabric orientation is correct.

Warranty: AccuQuilt GO! dies are guaranteed for one year.

Details and Dimensions
Designer AccuQuilt
Compatible Fabric Cutter GO! Baby Fabric Cutter (55600), GO Fabric Cutter (55100S)
Cutting Mat/Plastic Required GO! Cutting Mat, 6 in. x 6 in. (15.2 cm x 15.2 cm) Item 55137
Cut Size Two 5"W x 5"H (13 cm x 13 cm) Triangles
Finished Size 4 1/2"W x 4 1/2"H (11 cm x 11 cm) Triangles
Die Board Size 6 in. x 6 in. (15.2 cm x 15.2 cm)
Item 55397
Weight in lbs. 1.56
Brand AccuQuilt
Warranty Limited One Year

In stock items will ship within 2 business days if ordered before 12:00 p.m. CST Mon-Fri. Most in-stock items will arrive at your U.S. address 3-8 business days (Ground Shipping) after your order is shipped.

Please note that deadlines for certain items, including Deluxe Cutting Cabinets (SKU 50903), are different than those of general merchandise as those items cannot be expedited. To make sure your gift selection can arrive on time, always check the Shipping tab located at the bottom of the specific product page.

The shipping time frames above apply to in-stock merchandise delivered to the contiguous United States, and does not include Alaska, Hawaii or APO/FPO addresses.

Studio Backordered items are currently out of stock, but are available for purchase.  Your entire order will ship with the backordered item(s) within 12 business days.

Pre-Order items will ship as indicated on the product page. Once shipped, your items will arrive at your U.S. address 3-8 business days (Ground Shipping) after your order is shipped.

Help & Guides

Customer Reviews

Overall Rating

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  • David · 6/3/2017

    A really useful die pattern

    I use this die regularly especially when making small baby or lap quilts, the die is great to link in with squares to give a lovely overall effect to the finished quilt, especially if you use it to mix and match your fabrics. A really useful die this one in my opinion.

  • Bev · 5/29/2017

    4 half square triangle/12

    I recently made a quilt that called for cutting 108 squares, then cutting them into half square triangles. Needless to say, this was extremely time consuming to do by hand, and not as accurate. I cut the second quilt and partially assembled it in two days. A real timesaver, and so much more accurate. I love my accuquilt.

  • Nicole · 5/22/2017

    Must Have!

    This die us a staple in my collection. Great for several types of blocks.

  • Lori · 5/13/2017


    These dies are amazing. Make cutting so quick and easy.

  • David · 5/11/2017

    Great die to use on a range of projects

    I have made three tote bags all with this die - the colour combinations that you can use are amazing. The outsides of the bags are really stunning and this is a worthwhile die to have in your collection.

  • Judy · 2/15/2017

    Made my project so easy

    This die made making half square triangle blocks so much more accurate and easy than cutting 4 and 7/8" squares. Using the die was also time saving and made my project go much faster. I'm glad I ordered the half square due to make my quilting project much easier.

  • Stephanie · 1/25/2017

    4.5 inch die

    I had to order a second one. Wore the first one out making dog blocks.

  • Shirley · 11/24/2016

    Half square triangle

    I really love the accuracy and precision of the

  • sarah · 10/9/2016


    I am so glad that one day your web address appeared in my inbox and I followed it to you site, I am a beginner quilter, I had made my first quilt and was about to give quilting up, because I wanted a hobby the did take a week just to set up before I could start sewing the squares and triangles , I had thought about going back to just sewing, but I wanted something different and I thought quilting would be it , now that I discovered these Dies, it is much more easier and faster, more accurate, my quilts looks better and I am proud of them, I can actually do two in one week now, and then some other small projects, Thank you

  • Susan · 9/26/2016

    Outstanding Triangle Piecing

    How I wish I had had this die a number of years back!!! I made a red and white quilt by cutting squares and then halving them into triangles (color by color). It took a while to do this and then sewing them together took some time having to match up the corner tips and not stretch them out of shape. This die makes it sooooo easy to do this now. I can layer the different color fabrics on my Accuquilt cutting machine and cut out a bunch of triangles at one time. Then sew them together one after another. Looking forward to using this die a lot!