Why Does My Jigsaw Blade Keep Bending? Causes and Fixes
A jigsaw blade usually bends because it is being pushed sideways or forced through the cut faster than its teeth can remove material. The usual causes are heavy feed pressure, a dull or clogged blade, tight curves, and the wrong blade for the material. Ease off the pressure, match the blade to the job, and check that the blade is seated fully in the saw.
Diablo DJT128BHMBest overall
Bosch T128BHM3Best for laminate flooring
Diablo DJT102BF5Best for plexiglassWhat is happening when a blade bends
A jigsaw blade is a thin strip of steel held at one end only. The saw pulls it up and down while you push the saw forward. The blade has very little sideways strength, so any force that is not in line with the cut makes it flex.
That flex shows up as a cut that leans, a bevel on the edge, or a blade that bows and sometimes snaps. In most cases the blade is not defective. It is following the easiest path, and the easiest path is often sideways.
The good news is that almost every cause is something you control: how you push, which blade you chose, how the work is held, and how the saw is set.
The most common causes
Most bending comes from a short list of problems. The table below matches what you see with the likely cause and the fix.
| What you see | Likely cause | Fix |
|---|---|---|
| Blade bows toward one side | Side pressure or steering the saw too hard | Guide gently and let the blade find its line |
| Blade bends and smokes or burns | Dull teeth, clogged gullets or feeding too fast | Slow the feed and swap in a fresh blade |
| Cut leans, edge is not square | Blade flexing in thick material | Use a stiffer, wider blade and cut slower |
| Blade twists in a tight curve | Blade too wide for the radius | Use a narrower scroll blade or make relief cuts |
| Blade wobbles from the first stroke | Blade not fully seated or worn guide roller | Re-seat the blade and check the roller |
| Blade bends when starting a cut | Starting with the blade already touching the work | Start the saw first, then ease into the material |
How to keep the blade straight while cutting
Speed matters too. A slower feed gives each tooth time to clear its chips. A blade that cannot clear chips packs up, heats and bends. Pitch and sap can also build up on the sides, so a non-stick coating, where a blade has one, can help reduce heat and friction.
- Clamp the workpiece firmly so it cannot vibrate or shift, and support both sides of the cut line.
- Rest the saw's base plate flat on the surface before you pull the trigger.
- Start the saw at full speed before the blade touches the material.
- Push forward with light, steady pressure. If you hear the motor strain, you are pushing too hard.
- Follow the line with the saw body, not by twisting the handle. Turning the blade sideways in the cut is a top reason for bending.
- For tight curves, cut a series of relief cuts toward the line so waste falls away and the blade is not squeezed.
- Stop and replace the blade as soon as cutting slows or you smell heat.
Choose a blade that resists bending
The blade you choose has a large effect. A blade that is too fine for thick wood clogs and heats. A blade that is too coarse can grab and kick sideways. Our best jigsaw blades page lists material, teeth per inch (TPI) and length side by side, which makes it easier to match the blade to the work.
As a general rule, fewer teeth cut faster and clear chips more easily, while more teeth cut slower and cleaner. For example, the DEWALT DW3750-5 is a 6 TPI bi-metal blade with deeper gullets for quick wood cuts, so it can clear chips in thick lumber. At the other end, the Bosch T101AOF is a 20 TPI bi-metal blade meant for scroll or curved cuts in laminate flooring.
Blade length matters as well. A shorter blade has less unsupported length to flex. The Bosch T102BF is 2.625 in long, the shortest of the 17 blades on our page, and it is listed for straight cuts in thin acrylic. The longest blades on the page are 4 in, which suit thicker stock but flex more if you force them.
| Blade | TPI | Length (in) | Material | Good for |
|---|---|---|---|---|
| DEWALT DW3750-5 | 6 | 4 | Bi-metal | Fast cuts in wood |
| Bosch T128BHM3 | 14 | 3.62 | Carbide | Laminate, high-pressure laminates |
| Diablo DJT128BHM | 14 | 3.625 | Carbide | Laminate and melamine |
| Bosch T102BF | 13 | 2.625 | Bi-metal | Straight cuts in thin acrylic |
| Bosch T101AOF | 20 | 3.25 | Bi-metal | Curved cuts in laminate flooring |
Check the saw and the blade fit
If a good blade still bends, look at the saw. Every blade on our page is a T-shank, which locks into most modern jigsaws. Make sure the blade is pushed all the way into the clamp and locked, because a blade sitting loose or slightly crooked will wander from the start.
Next, look at the guide roller behind the blade. It supports the back edge and keeps the blade from twisting. If it is worn, gummed up or loose, the blade has nothing to push against. Clean it or replace it if it is damaged.
Also check the base plate. A loose shoe or a plate that is not square to the blade makes bevelled, leaning cuts even when the blade is straight. Finally, if your saw has an orbital setting, use a low setting for thin or fine cuts and a higher one only for fast cuts in thick wood. Heavy orbital action with a fine blade can push the blade around.
Safety notes
Always unplug a corded saw or remove the battery before you change a blade. Blades get hot during use, so let them cool or use a rag to handle them.
Wear safety glasses, because a bent blade can snap and throw fragments. Hearing protection is smart for long cuts, and a dust mask helps with laminate and melamine dust.
Keep both hands clear of the area under the work, and never try to straighten a bent blade while it is installed. Replace it instead.
Frequently asked questions
Can I straighten a bent jigsaw blade and use it again?
No. A bent blade has been stressed and is likely to bend or snap again. Replace it.
Do carbide blades bend less than other blades?
Carbide teeth stay sharp longer in hard sheet materials, and a sharp blade needs less pushing force. Technique and the right blade for the material still matter.
Should I use the orbital setting to stop bending?
Orbital action helps clear chips in thick wood but is not a cure for bending. Use a low setting for thin or fine cuts so the blade is not pushed around.
Why does my blade bend only on curves?
A blade that is too wide for the radius gets squeezed in the kerf. Use a narrower scroll blade and make relief cuts so the waste falls away.