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Starrett hardened steel squares are recommended when accuracy is required. Beams and chrome plated blades are hardened, ground and lapped to insure parallelism and straightness. Beam is grooved at inner corner for clearance of burr or dirt. Faces of the head are ground square. Tempered steel, machine divided blades in 1/8", 1/6", 1/6", 1/32" and 1/64" divisions.

Technical Details

-A popular tool for machinists, toolmakers, and patternmakers
-Provides virtually perfect layout and measuring results
-Includes adjustable, sliding blade
-Blade is durably designed out of hardened metal
-Features No. 4 graduation - 8ths, 16ths, 32nds, 64ths
-1/16" x 5/8" x 4" blade with 2-1/4" long beam - the smallest Starrett square we offer.
-A useful tool that is small enough to take anywhere!
-Faces of beam are 7/16" wide.
-The sliding blade is adjustable making it more practical for a wide variety of uses.
See more technical details

 "Handiest Tool in My Shop" 2010-07-04
By Hal 9000 (Sunny Phoenix)
Starrett's products are unrivaled. The 13A Double Square is no exception. Fits easily in my shop apron pocket. Provides quick precise measurements. Cannot ask for more.


 "Small and precise" 2010-02-08
By Howard Berman (Poughkeepsie, NY)
As expected the square arrived perfectly square. (Checking for square is easy: Use the square to make a line perpendicular to a reference line. Flip the square over and repeat. The two lines should be perfectly parallel.)

This is an easily pocketed measuring tool, perfect for laying out woodworking joints, for checking table saw blade for square, and for measuring smaller items.

The ruled lines are precise and easy to read.

The risk is that I might lose it and have to buy another--but other than that a superior piece of equipment with no apparent faults.


 "Great tool, but you can pay less for same accuracy" 2009-05-20
By G. Conner (USA)
Like others, I too revere the consistent accuracy of my Starrett tools and cannot say anything bad about them, except for the price.

In this particular (and rare) case, you can get the same accuracy with the "Lee-Valley Precision Double square", item number: 24N08.01.

It too is guaranteed to be within + / - .001" per foot. It has the same design and is also made in the USA, but it costs significantly less... seventeen-fifty less... about thirty-two percent. They have a six-inch model for only two dollars more.

Budget minded woodworkers who want this type of square can get the same performance for less from Lee Valley.com. Same feel, same look, same accuracy, same features... fewer ducats.


 "Be kind to yourself and your projects and get one!" 2009-03-24
By J. Stroup (Vancouver, WA)
This is the second time I have ever been moved to leave a review for a product I have gotten on amazon. I cannot recommend this double square enough. Really quality product, heavy and well made. Absolutely perfect, great size because it fits in a apron pocket or coat pocket easily. You probably want to get a larger Starrett combo square too, but for checking tools or other measuring devices as well as taking small measurements, this tool cannot be surpassed. The price may seem a little steep, but there is probably no greater favor you can do yourself and your projects than having dead accurate measuring devices.




 "Starrett 13A Double Square Review" 2009-01-20
By M. Stewart (N)
Excellent Measuring tool! Nice to have the confidence of an accurate square. Coupled with low price and Amazon's quick fulfillment, it's a no-brainer.

Thank you,
Loyal Amazon Customer
NC, USA


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