The lock is what keeps a folding knife's blade open while you use it, and it does a lot to shape how a knife feels in your hand. It decides how you close the knife, whether it works well for lefties, how strong it is, and how fun it is to fidget with. This guide walks through every common lock type you'll find at Cajun Knife & Gear, from classic lockbacks to button-lock autos and double-action OTFs.
Knife Lock Comparison Chart
| Lock Type | Strength | Ambidextrous | One-Hand Close | Fingers Out of Blade Path | Common On |
|---|---|---|---|---|---|
| Liner Lock | Good | No | Yes | No | Value to mid-range folders |
| Frame Lock | Very Good | No | Yes | No | Hinderer, Zero Tolerance, Strider |
| Crossbar / AXIS Lock | Very Good | Yes | Yes | Yes | Benchmade and others |
| Button Lock | Good–Very Good | Yes | Yes | Yes | Autos and modern manual folders |
| Lockback / Back Lock | Very Good | Yes | Two hands usually easier | Yes | Traditional and work knives |
| Compression Lock | Very Good | Mostly | Yes | Yes | Spyderco |
| Slip Joint (non-locking) | Not a lock | Yes | Yes | N/A | Case and traditional pocket knives |
| OTF Slider | Good | Yes | Yes | Yes | Microtech, Heretic and other OTFs |
Liner Lock
The liner lock is one of the most common locks in the world. A spring-tensioned strip of the handle's inner liner moves behind the blade when it opens, wedging it in place. To close, you push the liner aside with your thumb and fold the blade. Liner locks are simple, light and inexpensive to make, and they close easily with one hand. The downsides: they're not ambidextrous, and your thumb sits in the blade's path when closing, so build the habit of rolling your thumb out of the way.
Frame Lock
A frame lock works just like a liner lock, but the lock bar is cut directly from the handle itself, usually titanium. That thicker bar makes for a very strong, rigid lockup and a clean look. Popularized by Chris Reeve's Integral Lock, it's the lock of choice for hard-use folders from Rick Hinderer, Zero Tolerance and Strider. Many include a lockbar stabilizer or overtravel stop so the bar can't be pushed too far. Like the liner lock, it's right-hand or left-hand specific.
Crossbar Locks: AXIS and Its Cousins
Benchmade's AXIS lock uses a spring-loaded steel bar that rides in a slot across both sides of the handle. When the knife opens, the bar snaps into a notch on the blade tang. Pull the bar back with your thumb and the blade swings free, so you can flick it open and closed without your fingers ever crossing the blade's path. It's strong, fully ambidextrous and famously fidget-friendly, and it's a big part of why the Benchmade Bugout is so popular. Other brands have their own crossbar-style locks that work on the same idea.
Shop Benchmade knives.
Button Lock
The button lock started out on automatic knives and is now common on manual folders, too. A spring-loaded plunger in the handle engages the blade tang. Press the button and the blade releases. It's ambidextrous, quick and keeps your fingers clear of the edge. On autos from makers like Pro-Tech, the same button both fires the blade open and unlocks it to close. Some models also add a safety to prevent accidental opening in your pocket.
Lockback (Back Lock)
The lockback is the old-school classic. A rocker bar along the spine of the handle drops into a notch in the blade. Press down on the release near the back of the spine to unlock it. Lockbacks are strong, ambidextrous and simple, and they're found on plenty of hard-working traditional and modern knives. They're a little slower to close one-handed than a liner or button lock.
Compression Lock
Spyderco's compression lock is a twist on the liner lock: the lock leaf sits in the spine of the handle instead of in front of your fingers. You pinch it from the spine side to close, which keeps your fingers out of the blade's path. It's strong, smooth and one of the reasons Spyderco has such a loyal following. Shop Spyderco knives.
Slip Joint (Non-Locking)
A slip joint isn't technically a lock. A backspring holds the blade open with tension, but enough force on the spine will close it. Slip joints are the heart of traditional pocket knives like the stockman, trapper and peanut, and they're a staple from Case. Great for light cutting chores and for places where locking knives aren't welcome. Just don't use them for stabbing or heavy pressure on the spine.
OTF (Out-the-Front) Knives
OTF knives fire the blade straight out of the front of the handle with a thumb slide. Most of the OTFs we carry from Microtech and Heretic are double-action: push the slide forward to deploy and pull it back to retract. Single-action OTFs fire with the slide but must be reset by hand. Because the blade has to slide in a track, a little blade play is normal on OTFs, and it's not a defect. Shop OTF knives.
How the Blade Opens: Deployment Methods
- Thumb stud – a small post on the blade you push with your thumb.
- Thumb hole – a hole in the blade, Spyderco's signature.
- Flipper – a tab on the back of the blade you press with your index finger for a fast, snappy opening, usually on ball-bearing pivots.
- Automatic – a spring opens the blade at the push of a button. See our automatic knives.
- Assisted opening – you start the opening manually and a spring finishes it.
- Nail nick – the traditional groove for your thumbnail on slip joints.
Which Lock Should You Choose?
- Left-handed or want it to work for either hand: AXIS/crossbar, button lock or lockback.
- Hard use and maximum rigidity: a titanium frame lock or a strong crossbar lock. For truly heavy work, go with a fixed blade.
- Fastest one-hand open and close: button lock auto, AXIS or an OTF.
- Fidget-friendly: AXIS, button locks and OTFs.
- Lightweight and budget-friendly: liner lock.
- Traditional, gentleman's carry: slip joint or lockback.
Safety and Care Tips
Check your lock every so often. Open the knife, hold the handle firmly and apply light pressure to the spine. It shouldn't budge. Keep the lock area clean of lint and debris, and add a drop of pivot lube once in a while. If you ever see lock slip or excessive play, stop using it and contact the manufacturer or bring it to us. Automatic and OTF knife laws vary by state and city, so check your local laws before you carry.
Frequently Asked Questions
What is the strongest folding knife lock?
Well-made frame locks, crossbar locks like the AXIS and quality lockbacks are all very strong, and any of them is more than enough for normal cutting tasks. Execution and materials matter more than the lock type itself. If you need maximum strength, a fixed blade beats any folder.
Is a liner lock or frame lock better?
A frame lock is generally stronger and more rigid because the lock bar is thicker, while a liner lock is usually lighter and less expensive. Both close the same way.
What lock is best for left-handed people?
AXIS and other crossbar locks, button locks, lockbacks and OTFs all work the same in either hand. Liner and frame locks are made for one hand, though some models come in left-handed versions.
Is blade play normal on an OTF knife?
Yes. A small amount of blade play is normal on OTF knives because the blade must slide freely in its track. It doesn't affect normal cutting.
Is a slip joint knife safe?
Yes, when used for what it's designed for: light to medium cutting with pressure on the edge, not the spine. Because it doesn't lock, avoid stabbing, prying or heavy pressure on the back of the blade.
Find Your Next Knife at Cajun Knife & Gear
The best way to pick a lock is to try a few. Stop by our Lafayette store to feel the difference for yourself, or email info@cajunknife.com with questions. Browse our folding knives, automatic knives and OTF knives. Orders over $125 ship free, and orders placed by 2 PM Central ship the same day.
Want to know what your blade is made of? Read our Knife Steel Guide.