There are hundreds of switchblades in every shape and size, and the typical one is not small. The average handle runs about 5 inches, because the blade has to hide inside it along with the spring and the release, and the average blade about 3 inches, for a knife around 9 inches long when it fires. That is a lot of hardware, and it puts a floor under how small an automatic can be. Making the smallest one is as much an engineering problem as a novelty.
Folding pocket knives get smaller more easily, with handles around 4 inches and no mechanism to house, and fixed blades smaller still, since a fixed blade is just steel and a handle. A small fixed blade can be made to do real work. A small automatic has to earn its space.
Under Two Inches
Working automatics with blades under 2 inches do exist, and they are useful knives rather than novelties. The handle still runs about 3.5 inches to house the blade and the mechanism, which puts the whole knife at the size of a lighter, small enough to live on a keychain or in a coin pocket next to the rest of your everyday carry. TEKTO's A5 Spry Mini and A2 Badger both carry 1.85-inch blades, which is also the length that keeps them legal in California.
The Record
The smallest switchblade we have found is a picklock built by the custom maker 3Knives: 29 millimeters, or about 1.1 inches, fully open, and under an inch closed. That is roughly nine times shorter than an average automatic. It has silver bolsters, a picklock mechanism and a button release, and it is single action, so the blade fires out on the button and has to be pushed back into the frame by hand.
A knife this small is a piece of craft, not a tool. It will open an envelope and start a conversation, and it belongs on a keyring or in a collection. For anything that needs strength, from cord to cardboard to food, the right answer is the toughest knife that does the job, even if that means a longer one. Our OTF blade length guide lays out where the useful sizes start.
Small Automatics That Still Cut
Two OTFs under 2 inches, the side-opening Delta Mini, and the full-size Spry for scale.
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A5 Spry Mini
Regular price $179.99Regular priceUnit price per -
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OUT OF STOCK
Sold outA3 Delta Mini
Regular price $139.99Regular priceUnit price per -
People Are Asking
How small can a switchblade be?
The handle has to hold the blade, the spring and the release, so a working automatic rarely gets under about 3 inches closed. Novelty picklocks have been made at just over an inch open. They open and close, and that is about all they do.
What is the smallest TEKTO automatic?
The A2 Badger and the A5 Spry Mini, both with 1.85-inch blades, and the A3 Delta Mini at 1.90 inches. The two OTFs are about 3.2 inches closed, small enough for a keychain or a coin pocket.
Is a small switchblade legal?
It depends on the state, not the size, with one big exception: California allows automatics with blades under 2 inches, which is the reason the Badger and Spry Mini exist. Our 50-state guide covers where automatics are legal at all.
Is a tiny automatic worth carrying?
For boxes, tags, thread and the hundred small cuts of a day, a 1.85-inch OTF is a real knife. For rope, food and anything that needs leverage, step up to 3.5 inches. Size is a trade, not a score.
