Torx screwdriver: a complete guide to sizes and uses
If you have opened a laptop, removed a car door panel, or tightened an appliance handle, you have probably met a screw with a six-pointed star in the middle. That star is why you need a torx screwdriver.
A torx screwdriver is a hand tool or a powered driver bit made to fit torx screws, also called star screws. The tip has six points in a star shape, giving the driver more contact with the screw than a flat head or phillips tip, so it turns with less slipping and less damage. Torx screws are common in electronics, cars, appliances, bicycles, and furniture, where a secure fit matters.
This guide covers sizes, uses, security torx, and choosing the right tool, plus how a torx screwdriver differs from a torque screwdriver.
What is a torx screwdriver?
A torx screwdriver is a driver with a six-lobed, star-shaped tip that matches a torx screw recess. The six points spread the turning force evenly around the screw head.
When you turn a phillips screw, the driver can cam out, slipping up and out of the recess under too much force. A torx screwdriver is much less likely to cam out because the star shape locks into the screw.
You will find a torx screwdriver as a fixed manual driver, much like a standard screwdriver, or as a bit set that fits a handle or a powered driver. The tip should fit snugly, with no wobble: too small and it will spin, too large and it will not seat fully.
The star shape and torx sizes explained
The star shape is not decoration. Each of the six lobes takes a share of the turning force, which reduces stress on any single point. That design also lets a torx screwdriver apply more force than a phillips driver of a similar size without slipping.
Sizes are marked with a T followed by a number. The number is a size code, not a measurement in millimetres, and a larger number means a larger tip. Common sizes are T5, T6, T8, T10, T15, T20, T25, T27, and T30. Smaller sizes, such as T3 and T4, appear in very small electronics.
| Size | Typical use |
|---|---|
| T3, T4 | Small phones, watches, and tiny electronics |
| T5, T6 | Phones, tablets, laptops, and game controllers |
| T8, T10 | Laptops, hard drives, small appliances, and toys |
| T15, T20 | Appliances, furniture, bicycles, and car trim |
| T25, T27, T30 | Cars, motorcycles, outdoor equipment, and furniture |
| T40 and above | Machinery, larger vehicles, and heavy-duty fixings |
Size markings are usually stamped on the shaft or printed on the bit. Test the fit by hand first: the correct size will sit flat, fill the recess, and turn without rocking.
torx vs phillips vs flat head
A phillips screw has a cross-shaped recess. It is easy to use and widely used, but its main weakness is cam-out: under high force, the driver tends to slip out and damage the screw. A phillips screwdriver is still the right tool for phillips screws, but it is not a substitute for a torx screwdriver.
A flat head screw has a single straight slot. It works well for light fixings, but the driver can slip sideways out of the slot, especially if the slot is worn, and it gives less grip than a star shape.
A torx screwdriver offers a more secure fit than either of those two. The six-point star gives more contact area, spreads the load, and resists cam-out, so it suits screws that need firm tightening or repeated removal. The trade-off is that you need the exact size. Do not use a phillips driver on a torx screw, or a torx driver on a phillips screw, because the shapes do not match.
What is security torx?
Security torx, also called tamper-resistant torx, looks like a normal torx screw, but with a small pin in the centre of the star recess. A standard torx screwdriver cannot fit over that pin. These screws are used where the maker wants to stop casual removal, such as on public equipment, some appliances, game consoles, and car parts.
To work with security torx screws, you need a security torx bit or driver, with a small hole in the centre of the star tip to fit around the pin. The sizes use the same T numbers, often written as TR, such as TR10 or TR15. Many sets include both types.
Where torx screws are used
Electronics
Small torx screws hold together phones, tablets, laptops, game controllers, and hard drives. Sizes T3 to T10 are common here, so a precision torx screwdriver set is the right choice. Look for a rotating end cap and a magnetic tip. A mini electric screwdriver can help with larger numbers of small screws, but set the speed low and stop as soon as the screw is seated.
Cars and motorcycles
These screws are widely used in cars for interior trim, door panels, dashboards, lights, engine covers, and seat fixings. Sizes T15 to T30 are common. Car makers like torx because the screws stay tight under vibration. For car work, choose drivers with a comfortable grip and a shaft long enough to reach recessed screws.
Appliances and furniture
Washing machines, ovens, vacuum cleaners, and coffee machines use torx screws, often in sizes T10 to T25. Some use security torx to discourage opening. Check the screw type before you start a repair. A basic torx screwdriver set will cover most appliance repairs at home.
Flat-pack furniture, bicycle parts, and outdoor equipment also use torx screws. Sizes T15 to T30 are common for furniture fixings, while T25 and T30 are common for decking screws.
Choosing a set vs a single driver
If you only need one size for one job, a single torx screwdriver is the cheapest and simplest option. Buy the exact size you need and keep it with the equipment it belongs to if you will need it again.
For most people, a set is better value. A good screwdriver set with torx bits covers a range of sizes, so you are ready for the next job without another trip to the shop. Look for T8 to T30 for general home use, plus T3 to T10 for electronics, with both standard and security torx bits, bits made from chrome vanadium or S2 steel, a non-slip handle, a labelled case, and magnetic tips.
torx screwdriver vs torque screwdriver: the key difference
Many people get confused here, because the words torx and torque sound similar. They describe two different things, and a tool can be one, the other, or both.
A torx screwdriver is defined by its tip shape. It fits torx screws, and the word torx tells you what the end of the tool looks like. A torque screwdriver is defined by its function. It measures or limits the turning force, which is called torque, applied to a screw. The word torque tells you what the tool controls, not what shape the tip is.
A torque screwdriver can have a torx tip, a phillips tip, a flat head tip, or another tip. What makes it a torque screwdriver is a mechanism that clicks, slips, or signals when you reach a set level of torque, so you tighten to the right level without overtightening. A standard torx screwdriver has no torque control, so you judge the tightness by feel.
Why does torque control matter? In electronics, overtightening can crack a case, strip a thread, or damage a circuit board. In cars, it can damage a thread or distort a part. A torque screwdriver gives a consistent, repeatable result. You do not need one for every job: for a furniture screw or a battery cover, a standard torx screwdriver is enough. Consider one when the maker gives a torque value or when parts must be tightened evenly. In short, torx is the shape and torque is the force.
Buying advice
Start with the screws you actually need to turn. Check the size, check whether it is standard or security torx, and check how much space you have. For electronics, choose a precision set with small sizes. For general home use, choose a mid-size set that covers T8 to T30. For cars, choose longer shafts and a comfortable grip.
A good torx screwdriver should have a precisely machined tip, with clean, sharp points and no rough edges, and a straight shaft firmly fixed to the handle. An electric screwdriver with torx bits can speed up work with many screws, but use a low speed and avoid overtightening. If you want a powered option, compare models in our guide to the best electric screwdriver before you buy. For small or delicate screws, a manual driver is often safer.
Common mistakes to avoid
- Using the wrong size: a tip that is too small will spin and round off the screw, while a tip that is too large will not seat properly. Always test the fit first.
- Using a phillips driver on a torx screw: the shapes do not match, so the driver will slip and damage the screw.
- Applying too much force: stop when the screw is snug, unless the job calls for a set torque value.
- Forgetting security torx: if the screw has a pin in the centre, a standard torx driver will not fit.
- Overtightening small screws: small electronics screws need very little force, so tighten them gently.
If a screw is already stripped, stop before you make it worse. Try a slightly larger torx bit or a screw extractor. If the screw will not move, check whether it is rusted or held by threadlocker, and do not force it with a powered driver.
Frequently asked questions
What is a torx screwdriver used for?
A torx screwdriver drives and removes torx screws, which have a six-pointed star recess. It is common in electronics, cars, appliances, bicycles, and furniture, where the star shape gives a secure grip and reduces slipping.
What do the T numbers mean?
The T number is a size code, and a larger number means a larger tip. For example, T10 is larger than T8. Always match the T number to the screw, because the correct size will fit snugly with no wobble.
Is a torx screwdriver the same as a torque screwdriver?
No. A torx screwdriver is named for its star-shaped tip, while a torque screwdriver is named for its ability to control turning force. A torque screwdriver can have a torx tip, but it can also have other tips.
Can I use a torx screwdriver on a phillips screw?
No. The star tip does not fit the cross recess of a phillips screw. Use a phillips screwdriver for phillips screws and a torx screwdriver for torx screws.
What is the difference between torx and security torx?
Security torx screws have a small pin in the centre of the star recess. A standard torx screwdriver cannot fit over the pin, so you need a security torx bit, which has a hole in the centre of the tip.
Which torx size do I need most often?
For general home use, T10, T15, T20, and T25 cover many jobs. For electronics, T5, T6, and T8 are common. For cars, T20, T25, and T30 are common.
Conclusion
A torx screwdriver is a simple tool with a clear advantage. Its six-pointed star shape gives a secure grip, spreads the turning force evenly, and reduces slipping and damage. That is why torx screws are used in so many electronics, cars, appliances, and furniture items.
The key is to match the size exactly, check for a security pin, hold the driver straight, and avoid overtightening. A good set that covers the sizes you use most, with both standard and security bits, will handle most home, car, and electronics jobs. If you need controlled force for delicate work, consider a torque screwdriver with a torx bit. Remember: torx is the shape, torque is the force.
