T-shank and U-shank are two incompatible jigsaw blade standards. T-shank is modern (standardised since ~2005) and offers tool-free blade changes and better stability. U-shank is older and requires screwing or pinning the blade into place. Modern saws use T-shank; older saws use U-shank. They’re not interchangeable.
Quick Comparison Table
| Feature | T-Shank | U-Shank |
|---|---|---|
| Blade Change Time | 5â10 seconds (no tools) | 30+ seconds (requires screwdriver or hex key) |
| Stability | Better â blade is more secure | Looser â prone to vibration if pins aren’t tight |
| Interchangeability | Fits any T-shank saw (universal across brands) | Limited â most suppliers have stopped making U-shank |
| Common Era | 2005 onwards (all modern saws) | 1990sâearly 2000s (legacy saws only) |
| Cost | Standard pricing | Hard to find â premium pricing if available |
T-Shank: How It Works
A T-shank blade has a single flat piece of metal at the base shaped vaguely like the letter T (or an upside-down L). The saw’s chuck has a spring-loaded slot that grips the shank. To change a blade:
- Pull or swing open the chuck lever
- Insert the blade’s shank into the slot
- Close the lever â done
No tools needed, no screws to tighten, no pins to align. The blade is mechanically secure because the spring compresses around it.
U-Shank: How It Works
A U-shank blade has two small holes at the base. The saw’s clamp has two corresponding pins. To fit a blade:
- Align the blade’s holes with the saw’s pins
- Push the blade all the way down
- Tighten a screw or twist a lever to lock it in place
If the blade isn’t fully seated or the screw isn’t tight, you’ll get vibration and poor cut quality. It’s fiddly and slower than T-shank.
Can You Use T-Shank in a U-Shank Jigsaw?
No. A T-shank blade won’t fit into a U-shank clamp (the shank shape is wrong). Similarly, you can’t use a U-shank blade in a T-shank saw. They’re mechanically incompatible.
If you inherit or buy a U-shank saw, you’re stuck with whatever blade supply still exists for that shank type â which is dwindling.
How to Tell Which Your Jigsaw Uses
Method 1: Look at the clamp
- T-shank: The clamp has a vertical slot (no holes visible)
- U-shank: The clamp has two small holes where pins sit
Method 2: Try a blade
- Attempt to insert a T-shank blade
- If it slides in and grips with the lever, you have T-shank
- If the slot doesn’t match the blade shape, you have U-shank
Method 3: Check the manual
- Most manuals specify shank type in the accessories section
Which Brands Made Which Shank Type?
T-shank modern models: Makita (all DJV series), DeWalt (DCS series), Milwaukee (M18 JSA), Bosch (PST/PFZ), Ryobi (RJS)
U-shank legacy models: DeWalt (older corded models), Milwaukee (older lines), Bosch (very old PST models), Makita (pre-2005 models)
If you own a brand-new saw from any major manufacturer, it uses T-shank.
Why Did the Industry Switch?
T-shank is faster, easier, and more reliable. Tool-free blade changes mean you’re more likely to actually change blades when they dull (rather than push a dull blade beyond its life). The clamping mechanism is also more secure, reducing vibration and improving cut accuracy. U-shank is legacy because T-shank is objectively better.
Frequently Asked Questions
Can I use a reduction adapter to make U-shank blades fit my T-shank saw?
No. Mechanical adapters don’t exist for this, and any makeshift solution would be unsafe (blade could come loose during cutting). If you own a T-shank saw, you need T-shank blades.
Are T-shank blades more expensive?
No â they’re usually cheaper because they’re widely available. U-shank blades (when you can find them) are more expensive because demand is low.
If I’m buying a used jigsaw, what should I check?
Ask the seller whether it’s T-shank or U-shank. If U-shank, only buy if you’re getting a bundle of blades with it. Otherwise, buying new T-shank saws is more practical â they’re cheap and blades are readily available.
Do all modern jigsaws use T-shank?
All cordless and modern corded jigsaws use T-shank. If it was made after 2005, assume T-shank unless the manual says otherwise.