We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is a Keyhole Saw?

By C. Ausbrooks
Updated May 17, 2024
Our promise to you
About Mechanics is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At About Mechanics, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

A keyhole saw is a precision cutting tool with a long, thin blade used primarily for cutting tight curves and small holes in soft wood, plastic or drywall. Other names for the tool include alligator saw, drywall saw and compass saw. Keyhole saws are often used to create openings for pipes and electrical wiring, and for making small incisions that cannot be made with drills, electric saws or auger bits due to size constraints.

The blade of the keyhole saw is attached to a wooden, iron or plastic handle, and blades vary widely in length, width and number of teeth. Most keyhole saw blades are 5 to 15 inches (12.7 to 38.1 centimeters) in length, with 5 to 20 teeth per inch. Keyhole saws may be fixed or retractable, depending on how the blade attaches to the handle.

A retractable keyhole saw commonly features an iron handle, and various blades are attached to the handle with screws. The blade can also be retracted into the handle to protect it from flexing or damage if it is obstructed during use. Fixed keyhole saws are less expensive and perform the same task, but they lack the ability to retract.

In the construction trade, the keyhole saw has experienced modification to make it easier and more efficient to use for various tasks. Keyhole saw blades with a sharpened tip are available, and these blades are gently pushed through drywall or soft wood. This process negates the need for using an electric drill to create the initial hole, saving both time and power.

Using a keyhole saw requires first drilling a starter hole into the wall and then inserting the blade. The saw is moved forward and back slowly by hand, and the blade cuts on the back stroke. If a sharpened-tip blade is being used, a starter hole is unnecessary and the blade is simply inserted into the wall and used to cut away the desired portion. Applying excess pressure on the blade while cutting should be avoided, as this can cause the blade to become stuck or jammed in the wall.

Older keyhole saws require more maintenance than newer models, as the older versions typically have crosscut teeth that need to be manually sharpened by a craftsman. More contemporary models of the saw feature replaceable blades that can be removed when they become dull or damaged. Newer fixed blade keyhole saws are often replaced completely when necessary, as this usually costs less than having the blade repaired.

About Mechanics is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
By JimmyT — On Aug 17, 2011

Can you use a keyhole saw to cut PVC pipe? I know the real purpose of a keyhole saw is to fit into small areas and cut out holes, but I have a piece of pipe that I need cut, but don't have anything else to cut it with.

I have a hacksaw, but the blade on it is too dull to really do anything. I don't think the keyhole saw has a plastic cutting blade on it, but it seems like it might work. I just want to make sure I'm not going to ruin the blade by using it.

By cardsfan27 — On Aug 17, 2011

If you are a someone who likes to do home improvement projects, a drywall saw is a must in the toolbox. At the time I bought mine, it was more of an impulse buy, but I've used it several times since.

My family used to own some rental houses, and I ended up being the person who had to do repairs when someone moved out. If I ever had to replace sections of drywall, the keyhole saw could cut out holes for light switches and outlets in a flash.

By kentuckycat — On Aug 16, 2011

@titans62 - I'm pretty sure you can get a metal saw blade for a keyhole saw. I'm not positive how much one would cost, but I can't see them being extremely expensive. If you got one, I'm sure the edge wouldn't be all that smooth. Keyhole saws tend to be pretty rough cutting saws.

If you have or can get a reciprocating saw, that might be a better option. I know they make reciprocating saw blades for metal, and it would give a fairly smooth cut. I don't know how much cutting you're needing to do, but metal shears would be another option. They wouldn't have any problem cutting aluminum. You can buy special shears for cutting rounded edges, too.

By titans62 — On Aug 15, 2011

Do they make keyhole saws for cutting metal? I am working on a project, and I need some sort of saw that I can use to cut some holes in a piece of sheet metal. The metal is aluminum if that matters. I have looked at the hardware store in town, but it is small, and they didn't have one. I don't want to spend a trip to a bigger store if these don't exist.

I have a drywall keyhole saw, but the teeth on it aren't the right size or type to be cutting through metal. If they do make them, how much do they usually cost? Also, how smooth is the edge they leave? Obviously, I'd rather not have sharp jagged edges left over.

About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.

About Mechanics, in your inbox

Our latest articles, guides, and more, delivered daily.