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Starrett Steel Combination Square with Square Head - 12" Blade Length, Cast Iron Heads, Reversible Lock Bolt, Scriber, Spirit Level, 4R Graduation Type - 11H-12-4R

4.7 4.7 out of 5 stars 412 ratings

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Purchase options and add-ons

Material Alloy Steel
Brand Starrett
Style Heavy Duty,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.

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 1 x 1.4 x 12.3 inches; 1.22 Pounds
  • Item model number ‏ : ‎ 11H-12-4R
  • Date First Available ‏ : ‎ July 18, 2004
  • Manufacturer ‏ : ‎ Starrett
  • ASIN ‏ : ‎ B0002CSBNO
  • Customer Reviews:
    4.7 4.7 out of 5 stars 412 ratings

Product Description

Product Description

The Starrett 12" Combination Square with Square Head features a reversible lock bolt, scriber, spirit level, and hardened steel, photo-engraved blade with regular This product also includes a cast iron head with black wrinkle finish. 12", 4R Grad, Regular 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 Manufacturer

The 11H Combination Square series feature cast iron heads and machine divided, hardened, and tempered steel blades. Cast iron heads are not to be confused with the cheap imitation plastic or die cast heads on the market. The value of Starrett Tools is that they are accurate and will last.


From the brand


From the manufacturer

Brand Banner
Product Image

Starrett Logo

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.

Combination Square

Starrett combination square consist of a machine-divided, hardened and tempered steel rule (or blade) on which is mounted an adjustable square head. A reversible lock bolt allows the blade to be turned over or end-for-end without removing the lock bolt or nut. This ensures true alignment of the blade and heads. Square head are made of cast iron and are not to be confused with the cheap imitation plastic or die cast heads on the market.

  • Cast iron head with black wrinkle finish
  • Square blade easy-to-read, sharp graduation
  • Bearing surface is accurately ground
  • 12-inch hardened steel, machine divided blade

Product guides and documents

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Customer reviews

4.7 out of 5 stars
4.7 out of 5
412 global ratings

Customers say

Customers like the appearance, squareness and accuracy of the ruler. For example, they mention it's a professional tool, it holds tight and is highly accurate. That said some are happy with fit and quality. Opinions are mixed on readability and value.

AI-generated from the text of customer reviews

57 customers mention57 positive0 negative

Customers are satisfied with the quality of the ruler. They mention that it is accurate, solid, and built to last. The square is made of hardened steel, making it less likely to break when dropped. Overall, customers are happy with their purchase and recommend it to others.

"This is definitely a well built precision instrument, which it should be, given its price." Read more

"Precision square. Built to last!" Read more

"...Pros:*Very precise*Well built*SturdyCons:*NoneAdditional Considerations:..." Read more

"...The square is solid and has no wobble after tightening the lock screw down. The quality of the machining is excellent and the ruler is easy to read...." Read more

33 customers mention30 positive3 negative

Customers are satisfied with the accuracy of the ruler. They mention it's highly accurate, with machined precision.

"Precision square. Built to last!" Read more

"...Pros:*Very precise*Well built*SturdyCons:*NoneAdditional Considerations:..." Read more

"...most important thing however is that you know that this will be 100% accurate and square to 90`...." Read more

"...my pro square, it’s one of the tools I use the most because it’s very accurate and easy to use...." Read more

23 customers mention23 positive0 negative

Customers are satisfied with the square. They mention it's a great product, it'll be 100% accurate and square to 90. Customers also say that it'd be right on point and can be counted on for precision 45 degree and 90.

"...I am not disappointed! This square is perfectly square out of the box and feels very sturdy in my hands...." Read more

"...This square is right on point and I can count on it for precision 45 degree and 90 degree checks and marks. I am glad I went with the starret model...." Read more

"It’s beautifully made, dead square, locks up tight, and easy to read the fine graduations...." Read more

"Not a flashy product but a great combo square. I bought the Starret because I wanted a perfectly square, combo square and that is what I got...." Read more

19 customers mention17 positive2 negative

Customers like the tightness of the ruler. They say it holds tight, has no wiggle or play, and the tightening mechanism feels more robust. The square is solid and has no wobble after tighten the lock. The lock works great and it stays nice and tight, yet it's easy to release. The smooth action and sturdy construction all around well build tool makes it feel very sturdy in their hands.

"...This square is perfectly square out of the box and feels very sturdy in my hands...." Read more

"...It feels solid while being used and the ruler doe not move at all when the nut is tightened. I could not ask for more from a combo square...." Read more

"...The square is solid and has no wobble after tightening the lock screw down. The quality of the machining is excellent and the ruler is easy to read...." Read more

"It’s beautifully made, dead square, locks up tight, and easy to read the fine graduations...." Read more

12 customers mention12 positive0 negative

Customers are satisfied with the appearance of the ruler. They mention it's a beautiful tool, smooth, precise, and easy to read. Some say it'd make a great addition to any tool collection. Overall, customers are happy with the quality and appearance of this professional tool.

"great tool" Read more

"...The quality is outstanding and it is another outstanding tool to add to my tool box...." Read more

"...I've tried just about all of them. This one is truly a wonder to use. It's smooth, precise and easy to read. More importantly, it is in fact, square...." Read more

"...Starrett makes good, solid, workmanlike tools, and you can't go wrong with one. Simple." Read more

7 customers mention7 positive0 negative

Customers are satisfied with the fit of the ruler. They mention that it fits perfectly, has an incredibly precise fit of head to blade, and is adjustable and square. Customers also appreciate the great adjusting components.

"...I was able to square and plumb my saw blades and guides and everything fits perfectly...." Read more

"...The fit and finish are top notch, from the hardened awl to the etching on the blade...." Read more

"...The Starrett has great adjusting components too. A slight twist of the knob with my thumb and the rule is locked in place. No wiggles...." Read more

"Accuracy at a great price. Used for woodworking. Fit and finish is top. It's a Starrett Buy one." Read more

26 customers mention18 positive8 negative

Customers are mixed about the value of the ruler. Some mention it's sturdy and well made, worth the price, and a solid investment that will last forever. However, others say that it works well but is expensive and not sure it'll last forever or is any better than any other ruler.

"...Great product. If you are on the fence about it, do it, it's worth the expense if you need accuracy." Read more

"...I am glad I went with the starret model. It costs more but is worth it in the long run...." Read more

"...to get a different square, and I'm disappointed, because it was not cheap, and I like the feel and weight of this tool." Read more

"...Pretty durable too. If you want an accurate tool, this is fairly priced. I know woodpeckers has more features, but it also costs more." Read more

15 customers mention9 positive6 negative

Customers are mixed about the readability of the ruler. Some mention that it's easy to read, with clear markings and numbers. However, other customers say that it is very hard to read the measurements on the rule, due to moisture on the blade.

"...The quality of the machining is excellent and the ruler is easy to read. I also appreciate that it is made in the US...." Read more

"...one big drawback, it attracts rust like a magnet making it hard to read at the ends...." Read more

"It’s beautifully made, dead square, locks up tight, and easy to read the fine graduations...." Read more

"...and getting a little bit of moisture on the blade, it is impossible to read on the 32nds/64ths side...." Read more

A very solid combination square. Worth the money.
5 Stars
A very solid combination square. Worth the money.
This combination square is great. I am all about saving money on tools any time I can. Gauges and measuring equipment though are one of those areas where the money spent is worth it for a lifetime. This square is right on point and I can count on it for precision 45 degree and 90 degree checks and marks. I am glad I went with the starret model. It costs more but is worth it in the long run. The faces were machined perfectly flat on the square I received and all of the degree measurements check out on several accurate protractors. It feels solid while being used and the ruler doe not move at all when the nut is tightened. I could not ask for more from a combo square.Dimensions can be seen in the photos I have attached. One side has 1/32" graduations.Included in the box will be a certification from the factory.Pros:*Very precise*Well built*SturdyCons:*NoneAdditional Considerations:When it comes to gauges. Spend the money. Its worth it in the long run.Overall: 5/5 stars (>=.5 rounds up, <.5 rounds down) => 5 starsIf you have any further questions regarding the product in my review please leave a comment below and I will get back to you as soon as possible.
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Reviewed in the United States on February 12, 2023
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Reviewed in the United States on June 14, 2016
Customer image
5.0 out of 5 stars A very solid combination square. Worth the money.
Reviewed in the United States on June 14, 2016
This combination square is great. I am all about saving money on tools any time I can. Gauges and measuring equipment though are one of those areas where the money spent is worth it for a lifetime. This square is right on point and I can count on it for precision 45 degree and 90 degree checks and marks. I am glad I went with the starret model. It costs more but is worth it in the long run. The faces were machined perfectly flat on the square I received and all of the degree measurements check out on several accurate protractors. It feels solid while being used and the ruler doe not move at all when the nut is tightened. I could not ask for more from a combo square.

Dimensions can be seen in the photos I have attached. One side has 1/32" graduations.

Included in the box will be a certification from the factory.

Pros:
*Very precise
*Well built
*Sturdy

Cons:
*None

Additional Considerations:
When it comes to gauges. Spend the money. Its worth it in the long run.

Overall: 5/5 stars (>=.5 rounds up, <.5 rounds down) => 5 stars

If you have any further questions regarding the product in my review please leave a comment below and I will get back to you as soon as possible.
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Customer imageCustomer image
29 people found this helpful
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Reviewed in the United States on January 2, 2016
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Top reviews from other countries

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Nick Smolak
5.0 out of 5 stars Worth the money
Reviewed in Canada on July 6, 2021
Eliud
5.0 out of 5 stars Starrett, no hay mas que decir.
Reviewed in Mexico on November 23, 2020
Amazon Customer
5.0 out of 5 stars Excellent tool, superb quality!
Reviewed in the United Kingdom on May 2, 2022
allesschön
5.0 out of 5 stars Eine günstige Alternative zur metrischen Variante
Reviewed in Germany on January 16, 2022
Nazmudeen khan
5.0 out of 5 stars Prefect piece of precision
Reviewed in Canada on July 14, 2021