Grab the wrong driver and you’ll round off a screw head in seconds, turning a five-minute job into a drilling-and-extracting nightmare. Understanding screwdriver types and uses is the difference between clean, confident repairs and a drawer full of stripped fasteners. There are far more than the two everybody knows, and each tip profile exists to solve a specific problem, whether it’s transferring more torque, resisting cam-out, or keeping tamperers out of an appliance.
This guide breaks down every common screwdriver, what it’s built for, and how to build a set that actually covers the projects you take on around the house.
Flathead (Slotted) Screwdrivers
The oldest design, the flathead, fits the single straight slot found on slotted screws. You’ll still see these on light switch plates, older furniture, and many electrical terminals. Sizes are measured by blade width, commonly ranging from 1/8 inch to 3/8 inch, and the blade must match the slot width closely or it will slip and gouge the surface.
Flatheads are handy beyond screws, doubling as pry bars, paint-can openers, and scrapers, though purists will tell you to keep a dedicated tool for that. Their main weakness is cam-out: because nothing locks the tip in the slot, the driver slides out easily under torque.
Phillips Screwdrivers
The cross-shaped Phillips is the workhorse of American hardware. Its self-centering tip seats quickly, which made it ideal for assembly lines. Phillips drivers come in sizes from PH0 (small electronics) up through PH1, PH2, and PH3, with PH2 covering the vast majority of household screws.
The design intentionally cams out under high torque to prevent overtightening, which is helpful on a factory line but frustrating when you’re driving a stubborn screw by hand. Match the number size to the screw to minimize slipping, and replace any driver with a worn, rounded tip.
Robertson (Square) Screwdrivers
Popular in Canada and increasingly in the US, the Robertson uses a square-shaped recess. The deep square socket grips so well that screws often stay stuck on the tip, letting you start them one-handed. Robertson drivers come color-coded by size: yellow (#0), green (#1), red (#2), and black (#3).
Woodworkers and deck builders love square drives because they resist cam-out far better than Phillips and let you apply serious torque without stripping. Many pocket-hole and cabinet screws use this profile.
Torx (Star) Screwdrivers
The six-pointed star recess, branded Torx, is everywhere in modern electronics, automotive work, and appliances. Its design transfers high torque with almost no cam-out, which extends both bit and screw life. Sizes are labeled with a T followed by a number, from T1 in tiny electronics up to T40 and beyond in automotive applications. T15, T20, and T25 cover most consumer gadgets and hardware.
- T6–T10: Laptops, phones, game controllers.
- T15–T25: Appliances, lawn equipment, furniture hardware.
- T27–T40: Automotive brakes, larger machinery.
You’ll also encounter Torx security screws with a small pin in the center, which require a hollow-tipped security Torx bit to engage.
Hex (Allen) Drivers
The hexagonal recess, often called an Allen, is standard on flat-pack furniture, bicycles, and machine bolts. While many people use the familiar L-shaped Allen wrench, hex screwdriver bits and drivers offer better control for repetitive assembly. Sizes are measured in millimeters (1.5mm to 10mm) and SAE fractions (1/16 inch to 3/8 inch).
Keep both metric and imperial hex sets on hand, because mixing standards leads to stripped sockets. A 4mm and a 5/32-inch look nearly identical but are not interchangeable.
Specialty and Security Screwdrivers
Beyond the everyday profiles sit a handful of specialty drivers designed to deter tampering or fit unusual fasteners. You’ll meet these eventually when you open a game console, replace a faucet cartridge, or service an appliance:
- Pozidriv: Looks like Phillips but has extra ribs for better grip; common on European products.
- Tri-wing and spanner: Found in electronics and amusement equipment to block casual disassembly.
- Clutch (bow-tie): Used in older RVs and mobile homes.
- Nut drivers: Hex-socket tips for turning small bolts and hex nuts.
A 40-piece security bit set runs about $15 and covers nearly every oddball fastener you’ll meet around the home.
Manual, Ratcheting, or Power Drivers?
The tip is only half the equation; the handle matters too. A standard manual screwdriver gives maximum feel for delicate work. A ratcheting screwdriver lets you keep the tip seated while you crank, speeding up repetitive tasks like assembling furniture. For driving dozens of deck screws, an electric or cordless driver with interchangeable bits saves your wrist entirely.
Magnetic tips help on every type, holding the screw so you can start it one-handed in tight spaces. Insulated handles rated to 1,000 volts are essential if you do any electrical work near live circuits.
How to Avoid Stripping Screws
Stripping a screw head wastes time and tools, but it’s almost always preventable. The cause is usually a mismatched tip that doesn’t fully seat in the recess, letting the driver cam out under pressure. A few habits keep your fasteners clean:
- Match the size exactly: A PH1 in a PH2 screw will round the head fast.
- Push and turn: Apply firm downward pressure so the tip stays seated.
- Keep tips fresh: Replace worn, rounded bits that no longer grip.
- Go slow with power tools: High speed and torque strip heads in an instant.
- Square up: Keep the driver aligned straight with the screw, not at an angle.
If a screw is already stripped, a rubber band laid over the head can give a worn driver enough grip to back it out, or a screw-extractor bit can bite into the damaged recess.
Building a Practical Screwdriver Set
You don’t need 50 individual screwdrivers cluttering a drawer. A smart starter kit covers 95 percent of home jobs with far fewer pieces. Prioritize the following:
- Phillips PH1 and PH2, plus a small PH0 for electronics.
- Flathead in 1/8, 3/16, and 1/4 inch.
- A Torx set covering T10 through T25.
- A square (Robertson) #2 for woodworking.
- An interchangeable-bit driver with a magnetic shank for everything else.
Once you know the profile, the number size, and the handle style that fit your work, you’ll stop stripping screws and start finishing projects faster. Keep the bits organized, match the driver to the recess every time, and toss any tip that has gone rounded or worn.
