Stanley 45-300 Aluminum Carpenters Square
- Aluminum carpenter’s square offers wide range of easy-to-read measurements, tables, and conversions
- Helpful reference conversion including new lumber, decimal equivalent, and metric conversion tables; 45-, 60- and 30-degree angle markings
- High tempered aluminum for maximum durability; protective lacquered coating; buffed finish
- Deep, embossed, 1/8-inch graduations for long-term visibility
- Body: 24- by 2-inches; tongue: 16- by 1-1/2-inches; backed by lifetime limited warranty
Product Description
24″ x 2″ buffed noncorrosive aluminum body. Tongue 16″ x 1 1 2″. 1 8″ graduations on face and back. Valuable tables and information imprinted on both sides of square. Embossed graduations and figures.Amazon.com Product Description
This Aluminum Carpenter’s Square is a versatile tool providing a wide range of easy-to-read English measurement scales, tables, and conversions, including the new lumber scale, decimal equivalent table, and metric conversion table; formula for squaring a foundation; 45-degree, 60-degree, and 30-degree angle markings; volume and area formulas; wood screw gauge table; drill and nail sizes (common and finish); quantity per pound; and depth scale. This square is built with high tempered aluminum for maximum durability and comes with a buffed finish and protective lacquered coating to resist corrosion. The design features deep, embossed, long-wearing 1/8-inch graduations for long-term visibility; graduations and table inform… More >>
Stanley 45-300 Aluminum Carpenters Square

I like steel. It’s tough and cheap. It makes life better. But I don’t like steel framing squares. They rust and rust doesn’t make life better. I like aluminum far more. In 5 years you’ll be glad you bought an aluminum square instead.
It is all you would expect a square to be. When you get any square, lay it up against the edge of a countertop and strike a line, then flip it over so the leg is pointing the other way and strike another line next to the first line. are they EXACTLY the same/parallel??? If not it’s not square….!
I’ve used the aluminum square for the same reason as other reviews. I was a rough carpenter, finish carpenter, cabinetmaker for a long time. Just getting into furniture making. I was trying to square up a new combination miter saw and couldn’t get it quite square to the fence. I even used brass shims and couldn’t get better than .06″.
Finally, I took the square and drew a line across a piece of 16″ ply. Then I flipped it and tried to draw over the same line. What I found was, the ends of the square, after years of drawing lines and using as a straight edge and cutting guide had worn off and were slightly rounded. Still, after 15 years of good service, I am ordering another today.
There’s not much to judge on a device like this. It’s aluminum, so it shouldn’t rust. The markings are clear and legible. It is indeed square (90 degree angle).
But I’m giving it 3 stars due to the obnoxious label on it. It’s 3″ long and runs edge to edge on the long side. When I tried to peel it off, I only got a little bit of label. I tried a few more times with the same result. The paper is peeling off in tiny pieces, and the adhesive is still stuck to the square.
After a few minutes with a razor blade and goo-gone I’ll have it off, and can use it happily ever after. But really, Stanley, use a label that comes off cleanly and easily.
Does what it’s supposed to do. Arrived square and still is to this day. I think it’s a must for any DIY inventory.