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Starrett Steel Combination Square with Square Head - 12" Blade Length, Cast Iron Head, Hardened Steel, Reversible Lock Bolt, Scriber, 4R Graduation Type - C11H-12-4R

4.8 4.8 out of 5 stars 572 ratings
$126.99 with 16 percent savings
List Price: $151.58

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Combination Square
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Purchase options and add-ons

Material Steel,Iron
Brand Starrett
Color Black
Style Combination Square
Graduation Range 1/64 Inches

About this item

  • Designed for Precision - The ruler has a 4R graduation type with 8ths, 16ths, quick reading 32nds, and 64ths that greatly increase the accuracy of your measurements.
  • Built to Last - Able to withstand even the harshest environments as our combination squares are designed to last a lifetime. They are very reliable and perfect for any project you take on.
  • Variety of Uses - The square head can be used for a variety of purposes such as scribing right angles and parallel lines, measuring, tri-squaring, mitering, depth gauging, height gauging, and levelling.
  • Quality Made - The blade is made of hardened steel, offering exceptional durability and resistance to wear, rough usage, high-impact pressure, and shock.
  • Versatile Layout Tool - Starrett squares are offered in a practical variety of styles to suit the needs of the individual, whether it be a toolmaker, mechanic, carpenter, or a "do-it-yourself" homeowner.

Frequently bought together

Starrett Steel Combination Square with Square Head - 12" Blade Length, Cast Iron Head, Hardened Steel, Reversible Lock Bolt,
$126.99
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Starrett Steel Combination Square with Square Head - 6" Blade Length, Cast Iron Heads, Hardened Steel, Reversible Lock Bolt,
$119.32
In Stock
Ships from and sold by Onkata.
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Starrett Steel Inch Reading Double Square with Hardened Graduated Blade - Ideal for Machinists, Toolmakers, Patternmakers - 6
$118.75
Get it as soon as Monday, May 20
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 12.7 x 6.65 x 1.55 inches; 1.22 Pounds
  • Item model number ‏ : ‎ C11H-12-4R
  • Date First Available ‏ : ‎ March 29, 2013
  • Manufacturer ‏ : ‎ Starrett
  • ASIN ‏ : ‎ B00C3J3G3E
  • Customer Reviews:
    4.8 4.8 out of 5 stars 572 ratings

Product Description

The Starrett 12" Combination Square with Square Head includes a reversible lock bolt, scriber, spirit level (except 4"), and hardened steel, photo-engraved blade with regular or satin chrome finish. The combination square includes a cast iron head with a black wrinkle finish. 12" , 4R Grad, Satin Chrome Blade. The square head has a precision ground 90° square face and a 45° miter face. It is a highly versatile layout tool for scribing right angles and parallel lines, and a measuring tool that can be used as a tri-square, miter, depth gage, height gage, and level. Starrett precision measuring tools have been the standard for high-quality dimensional measuring tools since 1880. The powerful tools meet or exceed the accuracy and performance requirements of national and international standards, and are traceable to the United States National Institute of Standards and Technology. The L.S. Starrett Company, founded in 1880, manufactures more than 5,000 variations of Precision Tools, Gages, Measuring Instruments, and Saw Blades for industrial, professional, and consumer markets worldwide.

From the brand

From the manufacturer

A

The combination square includes a hardened steel graduated rule and movable combination square and miter head with spirit level and scriber.

Combination Set

Combination Square with square and center head

Square Head

The Protractor Head is another available attachment. It has revolving turrets with direct-reading double graduations, a full 0 to 180° in opposite directions. This permits accurate and quick direct reading of angles above or below the blade.

The Center Head is an available attachment that provides an easy means of accurately locating the center of cylindrical or square work.

The square head has a precision ground 90° square face and a 45° miter face. It is a highly versatile layout tool for scribing right angles and parallel lines, and a measuring tool that can be used as a tri-square, miter, depth gage, height gage, and level.

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Product guides and documents

User Manual (PDF)

Looking for specific info?

Customer reviews

4.8 out of 5 stars
4.8 out of 5
572 global ratings

Customers say

Customers like the quality, accuracy, ease of use, and readability of the ruler. For example, they mention it's well built, accurate, and easy to read. Some are happy with appearance. That said, opinions are mixed on the value.

AI-generated from the text of customer reviews

74 customers mention68 positive6 negative

Customers are satisfied with the quality of the ruler. They mention that it's well-built, has top quality, and is built to last. Some say that the accuracy and precision are remarkable. Overall, most are happy with the product's quality and feel.

"Very well made, finely finished, perfectly accurate. Kind of strange to be this excited about a square!" Read more

"...The machining and finish is excellent. Durable cast-iron head and hardeded still blade with a beautiful satin chrome finish...." Read more

"...Yes, it's not cheap, but the quality and precision are remarkable...." Read more

"Love it. Great weight, solidly made, and beautiful etchings. A key part of my workshop." Read more

33 customers mention33 positive0 negative

Customers are satisfied with the accuracy of the ruler. For example, they mention it's super accurate, has high precision, and works with smooth precision. Some say that the detail and accuracy of markings are just incredible.

"Very well made, finely finished, perfectly accurate. Kind of strange to be this excited about a square!" Read more

"...Not with the Starett. Everything runs smooth and precise. The machining and finish is excellent...." Read more

"...It swaps out easily with the 12" blade. A great tool for measuring and marking in the shop." Read more

"...The new square is far superior to my old one. This square is extremely accurate and a pleasure to use...." Read more

14 customers mention12 positive2 negative

Customers find the ruler easy to use. They say it offers a satisfying grasp, and is simple to use with a secure clamp. Customers also mention that it's easy to make fine adjustments and is well-made.

"...It's very easy to make fine adjustments, there is no slop and the satin finish make it easy to see the measurement marks...." Read more

"...Also the twist tightener on the Starrett is more stabler and easier to use if that makes sense...." Read more

"...This square is extremely accurate and a pleasure to use...." Read more

"...combination square down works with smooth precision and offers a satisfying grasp of the ruler that speaks of the quality my Irwin could only..." Read more

8 customers mention8 positive0 negative

Customers find the ruler easy to read, with a satin blade and crisp markings.

"This square is well built and easy to read. I have and older Stanley Combination square, same design, as well as a wooden and brass fixed square...." Read more

"...This thing is built like a tank, is dead-on accurate, easy to read, and completely reliable. Worth every penny...." Read more

"...Dead accurate wherever you slide it. The satin blade is easily read, and the markings are super crisp. The scratch awl is handy, too." Read more

"Reliable, easy to read and handle. A workhorse." Read more

7 customers mention7 positive0 negative

Customers are satisfied with the appearance of the ruler. They mention that it is well-made, has a beautiful satin chrome finish, and has beautiful etchings. Some say that the scribe falls out.

"...Durable cast-iron head and hardeded still blade with a beautiful satin chrome finish...." Read more

"...It's very easy to make fine adjustments, there is no slop and the satin finish make it easy to see the measurement marks...." Read more

"Love it. Great weight, solidly made, and beautiful etchings. A key part of my workshop." Read more

"...can get a quality cast iron head on other squares, but the ruler on this one is gorgeous...." Read more

6 customers mention6 positive0 negative

Customers like the weight of the ruler.

"Love it. Great weight, solidly made, and beautiful etchings. A key part of my workshop." Read more

"...The Starrett is noticeably heavier and extremely well-finished-- but nothing fancy here- totally form following function." Read more

"Heavier than most combination squares. Handy and accurate scale when measuring 1/16ths, 1/32ths and 1/64ths." Read more

"...The quality of the Starett is just amazing. It's substantial weight and smoothness of operation put this combination square in a class all by itself...." Read more

23 customers mention15 positive8 negative

Customers are mixed about the value of the ruler. Some mention that it's well worth the money, while others say that it is expensive.

"...after I received it, right out of the box, I realized it was worth every penny...." Read more

"...Worth every penny.You definitely get what you pay for." Read more

"...This is unacceptable for an expensive tool like this one. I may continue to use it as a ruler but will not use it to check squareness." Read more

"Super accurate. Worth every penny. I find excuses to use this square." Read more

Worth every penny
5 Stars
Worth every penny
I bought this square to replace the one that I owned for decades, and as you can see from the picture that it shattered when I dropped it. The new square is far superior to my old one. This square is extremely accurate and a pleasure to use. My only complaint is that the ruler part of the square is difficult to read for someone, like me, who has reduced vision capabilities. But, I didn’t buy the square for the readability of the ruler, I have large print tape measures for that, so I stand by my 5 star rating. If I’d known how much better a new square is compared to my old one, I would have dropped it years ago.
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Top reviews from the United States

Carrie
5.0 out of 5 stars Still the standard.
Reviewed in the United States on April 7, 2024
Style: Combination SquareVerified Purchase
Very well made, finely finished, perfectly accurate. Kind of strange to be this excited about a square!
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BRIAN HUMMEL
5.0 out of 5 stars It was time to upgrade....
Reviewed in the United States on November 3, 2023
Style: Combination SquareVerified Purchase
The media could not be loaded.
 Finally upgraded to the Starett from my (6th) budget, big box store combination square. I grew progressively more and more frustrated with the failing spring tension mechanisms that hold the blades in place. If I took the blade out to reconfigure for a particular task, I'd spend a good minute trying to get the blade back in. Not with the Starett. Everything runs smooth and precise. The machining and finish is excellent. Durable cast-iron head and hardeded still blade with a beautiful satin chrome finish. This will be the LAST combination square purchased in my lifetime.
One person found this helpful
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Steve H
5.0 out of 5 stars but have a fair amount of slop to them and can be frustrating to set to very fine marks. Now that I finally made the jump ...
Reviewed in the United States on February 21, 2018
Style: Combination SquareVerified Purchase
I've been looking at this combination square for a long time. I have used 2 old Stanley models I inherited from my grandfather as well as a newer Stanley my kids gave me a few years ago. They work, but have a fair amount of slop to them and can be frustrating to set to very fine marks. Now that I finally made the jump to the Starrett I have asked myself why I waited so long. Yes, it's not cheap, but the quality and precision are remarkable. It's very easy to make fine adjustments, there is no slop and the satin finish make it easy to see the measurement marks. I use my combination squares for machine setups and marking joinery on pieces I build. I invested in the 24" blade to go along with this as I often need to make marks between 12-24". It swaps out easily with the 12" blade. A great tool for measuring and marking in the shop.
22 people found this helpful
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Amazon Customer
5.0 out of 5 stars The gold standard
Reviewed in the United States on August 12, 2023
Style: Combination SquareVerified Purchase
Love it. Great weight, solidly made, and beautiful etchings. A key part of my workshop.
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Jimmy Weiner
5.0 out of 5 stars Very Accurate
Reviewed in the United States on May 23, 2020
Style: Combination SquareVerified Purchase
This square is well built and easy to read. I have and older Stanley Combination square, same design, as well as a wooden and brass fixed square. In comparison to the Stanley, squareness is equal, but ease of reading the measurements goes to the Starrett. Also the twist tightener on the Starrett is more stabler and easier to use if that makes sense. I feel the improved engineering of the Starrett does offset the increased price ($20 bucks or so for the Stanley, in comparison to over $100 for the Starrett). Fair deal but again, I compared to a older 1980's Stanley. The fixed wooden and Brass Square, also pre 1980's can only be used for squareness, measurements are really tough to read. I would recommend this square for those wishing to upgrade or make an initial high end buy.
3 people found this helpful
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Mitch G.
5.0 out of 5 stars The highest quality by reputation and by using the tool as well
Reviewed in the United States on January 24, 2021
Style: Combination SquareVerified Purchase
I'm a hobbyist woodworker, but have made a fair investment in tools over the past couple of years. I have a nice Miller's falls 12" combination square but really need two since my work is spread out between my basement and my garage, so I started shopping online. There are plenty of combo squares 50% less expensive, but I kind of thought that having a Starrett as my reference for all my other squares would make sense and serve me well for a very long time. The other thing is that well cared for these can be sold for most of their purchase price down the road should that come up. I keep mine in its box with a rubber band around it and take it out when I need it, whereas the Millers Falls is usually on one of my benches or in a padded drawer. The Starrett is noticeably heavier and extremely well-finished-- but nothing fancy here- totally form following function.
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daveyd12
5.0 out of 5 stars Worth every penny
Reviewed in the United States on June 29, 2021
Style: Combination SquareVerified Purchase
I bought this square to replace the one that I owned for decades, and as you can see from the picture that it shattered when I dropped it. The new square is far superior to my old one. This square is extremely accurate and a pleasure to use. My only complaint is that the ruler part of the square is difficult to read for someone, like me, who has reduced vision capabilities. But, I didn’t buy the square for the readability of the ruler, I have large print tape measures for that, so I stand by my 5 star rating. If I’d known how much better a new square is compared to my old one, I would have dropped it years ago.
Customer image
daveyd12
5.0 out of 5 stars Worth every penny
Reviewed in the United States on June 29, 2021
I bought this square to replace the one that I owned for decades, and as you can see from the picture that it shattered when I dropped it. The new square is far superior to my old one. This square is extremely accurate and a pleasure to use. My only complaint is that the ruler part of the square is difficult to read for someone, like me, who has reduced vision capabilities. But, I didn’t buy the square for the readability of the ruler, I have large print tape measures for that, so I stand by my 5 star rating. If I’d known how much better a new square is compared to my old one, I would have dropped it years ago.
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Customer image
2 people found this helpful
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Schatzy B.
5.0 out of 5 stars Buy once, cry once.
Reviewed in the United States on August 29, 2023
Style: Combination SquareVerified Purchase
Starrett is the tops in quality. It doesn't get any better.
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Top reviews from other countries

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Carlos
5.0 out of 5 stars Exactitud!!!
Reviewed in Mexico on May 2, 2023
Style: Combination SquareVerified Purchase
Hace tiempo buscaba una escuadra exacta, la mayoría en el mercado son inexactas y cuando elaboras muebles sobre diseño esa diferencia se vuelve significativa. El precio es elevado, pero lo vale está herramienta!
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Dale
5.0 out of 5 stars worth the money
Reviewed in Canada on March 26, 2023
Style: Combination SquareVerified Purchase
I know its expensive and sometimes spending more does not insure you get accurate. Ive bought other Sterrett things that were not that acurate but this 12" combo square I recieved it dead on accurate and feels premium in my hand.
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Francisco Martín del Campo
1.0 out of 5 stars Disappointed
Reviewed in Mexico on September 15, 2022
Style: Combination SquareVerified Purchase
Compré este producto porque "Starrett" era signo de calidad. La escuadra venía desmadrada y por casi 2 milímetros. Me da la impresión que era un artículo defectuoso que ya alguien había regresado anteriormente. Cuando lo recibí estaba lleno de huellas, grasa, polvo y estaba todo raspado.
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Twelve
5.0 out of 5 stars Good square but needs a proper box
Reviewed in Canada on February 6, 2022
Style: Combination SquareVerified Purchase
Got this to replace my old combo square only real complaints are that the square has oil and finger prints in beaded in it but fixed that and the other is that it doesn’t come with a storage box. Otherwise it’s super easy to read and use and I’m happy that I bought it
One person found this helpful
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Amazon Customer
5.0 out of 5 stars La qualité c’est cela
Reviewed in Canada on June 12, 2022
Style: Combination SquareVerified Purchase
Bon prix
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