Screwdriver Guide: Drive Types, Sizes, and Building the Right Set
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A screwdriver transfers rotational force from your hand to a fastener through a shaped tip that engages a matching recess in the screw head. Using the wrong size or type cams out, strips the recess, and turns a simple task into a frustrating extraction project. Matching the right driver to the right fastener is the entire skill, and understanding what makes each drive type different will save you from damaged screws and sore wrists.
Drive Types You Will Encounter
Phillips (#) is the cross-shaped recess found on the majority of wood screws, machine screws, and general fasteners sold in North America. Henry Phillips patented the design in the 1930s, and it was deliberately engineered to cam out (the driver rides up and out of the recess) at a certain torque to prevent over-tightening on automobile assembly lines. This feature becomes a defect in other contexts when the recess strips before the screw is driven home. Phillips screws remain dominant because of sheer market momentum, not because the design is superior to alternatives.
Torx (star) is a six-pointed star recess that resists cam-out far better than Phillips. The straight walls of the star lobes transmit torque evenly without the upward force that ejects a Phillips driver. Increasingly common in construction screws, automotive fasteners, and electronics. Once you use Torx screws for deck building or cabinetry, Phillips feels primitive. Sizes are designated T10, T15, T20, T25, T30, and so on. T25 is the most common size in construction screws like GRK and Spax.
Robertson (square) is a square recess found primarily in Canadian construction and cabinetry. The screw sits on the driver tip without holding it, allowing a genuine one-handed operation where you pick up the screw on the driver tip and drive it into the workpiece. Excellent for high-torque applications where Phillips would strip. Common sizes are #1 (green), #2 (red), and #3 (black). Many premium deck screws sold in the US now use square drive or a combination square/Phillips head.
Flathead (slotted) is the oldest fastener design, a single straight slot. It offers no cam-out protection, no self-centering, and the driver slips sideways easily, gouging the surrounding surface. Still found on decorative hardware, electrical terminal screws, and some antique or restoration work. It is falling out of use for structural fastening because every other design works better. You will still encounter flathead screws on outlet covers, old door hinges, and vintage furniture.
Hex (Allen) screws have a hexagonal recess. Common in furniture assembly (particularly IKEA and similar flat-pack designs), bicycle components, and machine parts. Available as L-shaped keys, T-handle drivers, or bit-driver inserts. Ball-end hex keys allow driving at up to a 25-degree angle, which is useful in tight spaces where you cannot align the key straight.
Sizing: Why It Matters More Than People Think
A #2 Phillips driver fits #2 Phillips screws, which is the most common size in residential construction and general hardware. Drywall screws, deck screws, hinge screws, and most wood screws use a #2 recess. A #1 Phillips fits smaller screws found on outlet covers, hinges, machine screws, and electronics housings. A #3 Phillips fits large lag-type screws and heavy-duty fasteners. Getting this match right is the single most important thing you can do to avoid stripping screws.
Using a #2 driver in a #1 recess strips it because the larger tip cannot fully seat in the smaller recess. The contact area is reduced to the very tips of the cross, and the force concentrates on thin walls of metal that deform easily. Using a #1 in a #2 recess does not engage fully and cams out because the smaller tip rattles around inside the larger recess without transmitting torque effectively. Both mismatches damage the screw.
The tip must fill the recess completely. Any slop between the tip and the recess walls translates to reduced torque transfer and increased stripping risk. This is why using worn or wrong-size drivers destroys screws. A driver tip that has been rounded by years of use no longer matches the geometry of the recess even if it is nominally the right size. Replace drivers when the tips show visible wear.
For Torx, the sizing is more intuitive: T20 fits T20 screws, T25 fits T25. But there are security Torx (with a center post in the recess) that require a matching hollow driver. Standard Torx bits will not fit security Torx fasteners. Security Torx appears on commercial equipment, public furniture, and electronics where manufacturers want to discourage casual disassembly.
Japanese Industrial Standard (JIS) screws look like Phillips but have a slightly different geometry with less taper in the recess walls. Using a Phillips driver on JIS screws (common in Japanese motorcycles, electronics, cameras, and older audio equipment) strips them readily because the Phillips tip does not bottom out correctly. JIS drivers have a dot mark on the handle and engage these screws without slipping. If you work on Japanese equipment, JIS drivers are not optional.
Handle Design and Manual vs Power
A large, ergonomic handle transmits more torque with less hand fatigue. The wider the handle, the more leverage you have because torque equals force times radius. For driving and removing screws all day, handle comfort determines how your wrist and forearm feel by evening. Rubber-coated handles with finger contours reduce slipping and cushion your grip. Hard plastic handles are durable but less comfortable for extended use.
A ratcheting screwdriver lets you drive screws without regripping. The handle turns freely in one direction and engages in the other. A switch reverses the ratchet direction for driving or removing. Faster than a standard driver for high-volume work, and less fatiguing because you never release and reposition your hand between partial turns. Most quality ratcheting drivers have 72-tooth mechanisms that engage every 5 degrees.
A multi-bit driver stores interchangeable bits in the handle. Flip or swap between Phillips, Torx, flathead, and hex without carrying multiple tools. Convenient for light repair work and assembly where you encounter multiple fastener types in one task. The bit lock quality varies across brands: cheap ones drop bits inside the handle annoyingly, while quality models from companies like Megapro and Klein have secure magnetic bit holders.
For high-torque applications like driving 3-inch construction screws, removing corroded fasteners, or working through dense hardwood, a power drill with a bit holder is faster and saves your wrist. Manual screwdrivers excel where precision matters, where a power tool would over-drive the fastener flush and then strip it, or in tight spaces where a drill body does not fit. Electricians working inside panels and cabinetmakers doing final adjustments use manual drivers almost exclusively.
Building a Useful Set
Start with: #1 and #2 Phillips, a medium flathead (1/4 inch tip), T15/T20/T25 Torx, and a set of hex keys (metric and SAE). This covers 95 percent of household tasks: outlet covers, door hardware, furniture assembly, appliance repairs, and basic maintenance. You can buy these individually or as a set. Individual drivers from Wera, Wiha, or Klein cost more but fit precisely and last for years.
Add: #0 Phillips and precision drivers (eyeglass-size) if you work on electronics, laptops, or phones. Modern electronics use increasingly small Torx and pentalobe fasteners, so a precision set with those bits is essential for phone and laptop repair. Add: #3 Phillips and long-shaft drivers if you work on construction or automotive projects where you need reach into deep recesses. Add: Robertson #2 if you use deck screws, as many premium deck screws now use square drive.
Insulated screwdrivers (rated to 1000V) are required for electrical work inside panels. They have two layers of insulation with different colors so damage to the outer layer is visible. They do not make it safe to work on live circuits, but they reduce shock risk from accidental contact with energized components. Look for VDE certification, which is the international standard for insulated tools. Using non-insulated tools inside electrical panels violates code and common sense.
Buy quality over quantity. Three good screwdrivers (a #1 Phillips, a #2 Phillips, and a medium flathead) that fit precisely and have comfortable handles outperform a 50-piece bargain set with sloppy-fitting tips that strip everything they touch. Cheap screwdriver tips are stamped from soft steel that deforms after moderate use. Quality tips are machined from chrome vanadium or S2 tool steel and maintain their geometry through years of service.
Frequently Asked Questions
Why Does My Screwdriver Keep Stripping Phillips Screws?
Most likely you are using the wrong size (too small for the recess) or not pushing hard enough while turning. Phillips drivers need significant downward pressure to stay engaged. Approximately 80 percent of your effort should be push, only 20 percent turn. If the tip visibly does not fill the recess completely, use a larger size. If the tip is worn and rounded, replace the driver.
Are Magnetic Tips Worth It?
Yes for starting screws in awkward positions, overhead work, and any situation where you cannot hold the screw with your other hand. A magnetic tip holds the screw on the driver so you can start it one-handed. It does not affect the screw's final position or the driver's engagement quality. The magnet is not strong enough to interfere with electronics at typical working distances.
Can I Use a Screwdriver as a Pry Bar or Chisel?
Flathead screwdrivers are routinely abused as pry bars, paint can openers, chisels, and scrapers. This damages the tip, making it less effective as a screwdriver. If you need a pry tool, use a pry bar. That said, every working person has popped a paint can lid with a flathead screwdriver and will continue to do so. Keep a dedicated beater screwdriver for abuse and protect your good ones for actual fasteners.