Qty:1
$62.75 + $6.50 shipping
In Stock. Sold by PHILLIPS STEEL COMPANY

Other Sellers on Amazon
Add to Cart
$92.48
+ Free Shipping
Sold by: HomePlumbing
Have one to sell? Sell on Amazon

Size 4 Starrett Graduated Blade Double Square (1 Each)

4.8 out of 5 stars 37 customer reviews

Price: $62.75 + $6.50 shipping
Only 8 left in stock.
Ships from and sold by PHILLIPS STEEL COMPANY.
  • Enter your model number above to make sure this fits.
  • Perfect small-size tools for checking or setting 90 degree angles
  • 4" double square, accurate and adjustable
  • Measuring tools have working surfaces ground to a demanding +/- .00001"
  • All rules are marked with 1/64", 1/32", 1/16", and 1/8" graduations
See more product details
4 new from $62.75
$62.75 + $6.50 shipping Only 8 left in stock. Ships from and sold by PHILLIPS STEEL COMPANY.

Frequently Bought Together

  • Size 4 Starrett Graduated Blade Double Square (1 Each)
  • +
  • Starrett C33H-12-4R 12-Inch Combination Square with Square Head Only
  • +
  • Starrett 13C 6-Inch Double Square with Hardened Blade
Total price: $255.65
Buy the selected items together

Special Offers and Product Promotions

  • Working on a home project? Need some help? Check out Amazon Home Services and get a $20 Amazon Gift Card when you book your first service. Learn more


Product Description

Product Description

This square is very popular with machinists, toolmakers, and patternmakers. The sliding blades are adjustable making it practical for a wide variety of uses. The faces of the head are ground square, and the 6" (150mm) size has a level.

From the Manufacturer

A popular square with machinists, toolmakers, and patternmakers. The sliding blade is adjustable, making it more practical for a wider variety of uses than a common square with fixed blade.

Product Information

Technical Details

Part Number 13A
Item Weight 1.6 ounces
Product Dimensions 1 x 0.7 x 4.3 inches
Item model number 13A
Item Package Quantity 1
Warranty Description Manufacturer

Additional Information

ASIN B0002FUM2Y
Customer Reviews
4.8 out of 5 stars 37 customer reviews

4.8 out of 5 stars
Best Sellers Rank #52,878 in Home Improvements (See top 100)
#82 in Industrial & Scientific > Test, Measure & Inspect > Dimensional Measurement > Layout Tools > Squares
Shipping Weight 1.6 ounces (View shipping rates and policies)
Date First Available April 1, 2006

Warranty & Support

Product Warranty: For warranty information about this product, please click here

Customer Reviews

Top Customer Reviews

I spent years building projects using the standard "sort-a-square" you find at the hardware store. I always thought the Starret's were ridiculously priced and I refused to buy one. Needless to say many a project was almost perfect. Finally broke down and bought my first Starret Comb Square a few years ago and ever since it is the first layout tool I reach for!

I have the 12" combo square and this 4" Double Square. I love how accurate these squares are! They may seem on the pricey side but they are the most accurate and most used tools in my shop! The 4" never leaves my side.
1 Comment 17 of 17 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
I own both and use the double square 'twice' as much as the combo--just feels better in your hand, and it is practically indestructible if dropped. Changing the blade orientation requires you pushing up on the tightening mechanism and holding as you insert the blade groove. It would be nice to have a 1/8th--1/16th marking on both sides. I rarely have a need for the 1/32-64th markings.
Comment 18 of 19 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
I am a professional cabinetmaker and I would highly recommend this tool for anyone that needs accurate layout and checking machines for square. I have had other squares that were adequate, but this tool is the best there is.
Comment 15 of 16 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
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.
11 Comments 18 of 22 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
I like this square, but the Lee Valley equivalent is better than the Starrett. It is easier to read because of the matt finish on the steel. The Lee Valley square slides easier and is slightly larger and thicker as well.
2 Comments 17 of 21 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
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.
Comment 5 of 6 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
This is an extremely well-crafted item that contains high quality materials. The preciseness of this instruments lends it to making fine and accurate measurements. Highly recommended.
Comment 3 of 3 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
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.
Comment 3 of 3 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse

Most Recent Customer Reviews


Want to discover more products? Check out these pages to see more: ruler starrett, ruler 90, hardened square, starret tools, starrett square 6 inch