You pick up your knife, open the blade, and give it a wiggle. There it is — a subtle wobble, a little side-to-side or front-to-back movement that wasn't there before. That's blade play, and it's one of the most common issues folding knife owners encounter.
The good news: in most cases it's straightforward to fix, requires minimal tools, and takes less than ten minutes. Here's everything you need to know.
What Is Blade Play?
Blade play is any unwanted movement of the blade when it's in the open, locked position. There are two main types:
Lateral blade play — the blade moves side to side (left and right) when the knife is open. This is by far the most common type and is almost always caused by a loose pivot.
Vertical blade play — the blade moves up and down (toward the spine or toward the edge) when open. This is less common on modern folding knives and can be harder to fix, as it sometimes indicates worn components rather than a simple adjustment.
Most of the time, when people talk about blade play, they mean lateral play — and that's what this guide primarily addresses.
Why Does Blade Play Happen?
The pivot screw is the axis around which your blade rotates. It also applies lateral pressure to the blade, keeping it centred and firm between the liners or handle scales. Over time and with regular use, that screw can work loose — especially if the knife runs on bearings, which create a slightly different pressure dynamic than washers.
Common causes include:
- The pivot screw gradually backing out through normal use
- Vibration or impact (dropping the knife)
- Screws that were never properly torqued from the factory
- Worn washers or bearing races on older or heavily used knives
- Handle screws that are too loose, allowing the whole assembly to flex slightly
The fix in most cases is the same: find the right screw tension, and keep it there.
Tools You'll Need
Before you start, get these together:
A Torx screwdriver set — most modern folding knives use Torx (star-head) screws, most commonly T6, T8, or T10. A precision screwdriver set covering T5 through T15 will handle almost everything you'll encounter.
Knife lubricant — a purpose-made knife oil or a light machine oil. You'll want this on hand to re-lubricate the pivot after adjustment.
Blue Loctite (threadlocker 243) — if screws keep working loose, a single drop of blue Loctite on the threads will hold them in place while still allowing removal later. Never use red Loctite on a knife — it's permanent.
A soft surface — a folded cloth or thin foam mat keeps small screws from bouncing away and protects your scales from scratching. Or better yet a dedicated knife maintenance mat.
Optional but useful: a set of Torx bits that fit a standard screwdriver handle, which gives you better torque control than a small precision driver for final tightening.
Step 1: Identify the Type of Play
Open the blade fully until the lock engages. With one hand gripping the handle firmly, use the other to gently push the blade side to side and then front to back.
Side-to-side movement = lateral play → proceed to Step 2.
Front-to-back movement = vertical play → see the vertical play section below.
Both → start with the pivot adjustment; vertical play may resolve once the pivot is properly set.
Step 2: Try Tightening the Pivot First
This fixes blade play the majority of the time.
With the blade open and locked, locate the pivot screw — the large screw at the base of the blade. Using the correct Torx bit, tighten it in small increments (quarter turns). After each adjustment, close and open the knife to check the action, then test for play again.
You're looking for the sweet spot: pivot tight enough that the blade has no lateral movement, but the action still opens smoothly and the blade doesn't feel stiff or grindy. It's a narrow window on some knives, but you'll find it.
Don't overtighten. A pivot torqued too hard will kill the action, put stress on the bearing or washer system, and can strip the screw head. Snug and smooth is the goal, not maximum torque.
If the play disappears and the action feels good — you're done. Give the pivot a drop of oil, wipe off the excess, and get back to carrying.
Step 3: If Tightening the Pivot Doesn't Solve It
Sometimes the pivot is already at the right tension but the blade still has lateral play. This usually means the handle screws (the ones holding your scales or liners to the frame) have worked loose, allowing the whole assembly to flex slightly.
Check every screw on the knife — handle screws, clip screws, standoff screws if present. Tighten each one carefully, working from the ends of the handle toward the pivot. Recheck for blade play after each round of tightening.
If play persists after all screws are tight, the issue may be that the blade is sitting off-centre in the handle. To fix this:
- Loosen the pivot screw — not fully removed, just loose enough that the blade can shift.
- With the blade closed, push it gently toward the side of the handle it's closest to (you're pushing it toward centre).
- While holding it in that position, re-tighten the pivot.
- Open the blade and check for play and centring.
You may need to repeat this a couple of times to dial it in perfectly.
Step 4: Fix Screws That Keep Coming Loose
If you find your pivot or handle screws backing out repeatedly, the threads need some help holding. This is where blue Loctite comes in.
Remove the screw completely. Apply a single small drop of blue Loctite 243 to the threads — not the head, just the threaded section. Reinstall and tighten to the correct tension. Allow 24 hours for the threadlocker to fully cure before using the knife.
Blue Loctite holds firmly under normal conditions but remains removable with a screwdriver when needed — it won't permanently lock your knife together the way red Loctite would.
Dealing With Vertical Blade Play
Vertical play (blade rocking front-to-back when open) is a different beast. On modern production folders with screw-together construction, it can sometimes be reduced by carefully adjusting how the handle screws are sequenced — tightening from the far end toward the pivot last — which affects how the liners bear against the blade.
On older knives with pinned construction (no screws — the handle is assembled with solid pins), vertical play is typically caused by wear on the blade tang or pivot pin. This is harder to address without specialised tools and experience. If you have a vintage or pinned folder with vertical play that matters to you, a knife smith or experienced restorer is the right call.
For most current production EDC folders, true vertical play is uncommon and usually indicates either a manufacturing issue or significant wear — both worth investigating before continuing to carry the knife.
Prevention: Keep Play From Coming Back
The best approach to blade play is stopping it before it starts.
Check your screws periodically. Every few months — or after any impact — go over every screw on your knife. A quick check takes 30 seconds and catches loosening before it becomes noticeable play.
Keep the pivot clean and lubricated. Grit and dried lubricant in the pivot area create uneven wear over time. A clean, lightly oiled pivot stays in adjustment longer. Use a proper knife lubricant — not WD-40, which is a water displacer, not a long-term lubricant.
Use blue Loctite on problem screws. If a particular screw has backed out once, it'll do it again without threadlocker. Apply it proactively.
Don't use your knife as a pry bar. Lateral stress from prying is the fastest way to introduce blade play and bend or damage liners.
When It's Time for a New Knife
Occasionally, blade play is a symptom of something that can't be fixed at home — severely worn washers or bearings, damaged liners, a bent blade, or a stripped pivot. If you've worked through all the steps above and significant play remains, it may be time to either send the knife to the manufacturer (many brands offer servicing) or start looking at what's next in your collection.
If you're in the market for a well-engineered EDC folding knife in Australia with precise tolerances and proper pivot geometry from the factory, browse the full range at Blade Forge. Getting the right knife from the start — one built with CNC-machined tolerances and quality bearing systems — means far less time fussing with adjustments and more time actually using it.
Shop all folding knives at Blade Forge →
Quick Reference: Blade Play Fixes
| Problem | First Fix | If That Fails |
|---|---|---|
| Lateral (side-to-side) play | Tighten pivot screw | Tighten handle screws, re-centre blade |
| Screws keep loosening | Apply blue Loctite 243 | Check for stripped threads |
| Vertical (up-down) play | Adjust handle screw sequence | Professional service |
| Blade off-centre | Loosen pivot, push blade to centre, re-tighten | Repeat, check for liner damage |
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