Screwdriver Types, Sizes, and How to Use Them

Every home toolkit needs a good selection of screwdrivers. Understanding the different types of screwdrivers and when to use them is fundamental for any DIY project, from assembling furniture to tightening cabinet hardware. Using the wrong type or size can strip the screw, damage the tool, and make your job much harder. This guide will walk you through the common drive types, sizes, and proper techniques to help you work efficiently and safely.

Common Screwdriver Drive Types

The “drive” refers to the shape of the tip that engages with the screw head. Choosing the correct one is the first and most critical step.

Slotted (Flathead)

The slotted screwdriver, often called a flathead, has a single, flat blade. It’s one of the oldest and most basic designs. While still found in many applications like electrical outlets (which should only be serviced by a licensed professional) and some older furniture, it has a major drawback: the blade can easily slip out of the slot, damaging the screw or the surrounding material. For this reason, it’s often best to use other drive types when possible.

Phillips

Phillips head screws have a cross-shaped recess. The corresponding Phillips screwdriver is designed to cam out (pop out) under high torque to prevent over-tightening. They are extremely common in consumer goods, cabinetry, and general construction. It’s crucial to use the correct size (PH1, PH2, etc.) as a mismatch is a common cause of stripped screw heads.

Torx

Torx screws feature a six-pointed star pattern. This design allows for much greater torque transfer with significantly less risk of cam-out or stripping compared to Phillips or slotted drives. You’ll often find Torx screws in electronics, automotive components, decking, and high-stress furniture assemblies. They require a precise matching Torx driver (T10, T15, T25, etc.).

Other Drive Types

You may also encounter square (Robertson), hex (Allen), and Pozidriv screws. Square drives offer good grip and are popular in woodworking and framing. Hex drives are standard for furniture assembly and machinery. Pozidriv looks similar to Phillips but has additional lines between the cross; using a Phillips driver on a Pozidriv screw will likely damage it.

Screwdriver Sizes and Fit

Within each drive type, size matters immensely. A driver that is too small will spin inside the screw head, stripping it. One that is too large simply won’t fit.

• Phillips: Sized as PH000, PH00, PH0, PH1, PH2, PH3, and PH4. PH2 is perhaps the most common size for general household tasks.
• Slotted: Sized by the width and thickness of the blade tip (e.g., 1/8″, 3/16″). The blade should fit the screw slot snugly in both dimensions.
• Torx: Sized as T1 through T100, with T10, T15, T20, and T25 being very common in DIY projects.
• Hex: Sized in metric (mm) or imperial (inches), like 2mm, 4mm, or 1/8″, 1/4″.

When in doubt, test the fit. The driver should seat fully into the screw head without play or wobble, and without any part of the tip protruding above the screw head.

Handle and Shaft Variations

Screwdrivers aren’t just about the tip. The handle and shaft design affect comfort and function.

• Handle Design: Ergonomic, cushioned handles reduce hand fatigue and improve grip. Some have a fluted end for a palm-grip twist. A comfortable, non-slip handle is a key feature for any frequently used screwdriver.
• Shaft Length: Shafts come in short (stubby), standard, and long lengths. A short driver is great for tight spaces, while a long shaft provides more reach and greater turning leverage.
• Shaft Type: Most have a round shaft, but some feature a square or hexagonal bolster near the handle. This allows you to use a wrench on it for extra torque on stubborn screws.
• Magnetic Tips: Many modern drivers have a magnetized tip, which is invaluable for starting screws in hard-to-reach places or retrieving a dropped fastener.

How to Use a Screwdriver Correctly

Proper technique protects both you and your workpiece.

1. Select the Perfect Match: Always choose a driver that fits the screw head exactly. This is the most important rule.
2. Apply Firm Pressure: Push the driver firmly into the screw head as you turn to keep it fully seated and prevent cam-out.
3. Turn Slowly to Start: Begin turning slowly to establish the threads. For Phillips and slotted screws, be extra careful to maintain alignment.
4. Use the Right Force: Let the tool do the work. If a screw won’t budge, don’t force it. Check if it’s a reverse-thread screw (turns left to tighten) or apply a penetrating oil to rusted fasteners. For extremely stubborn screws, consider using an impact driver or consulting a professional.
5. Store Properly: Keep your screwdrivers organized in a tool roll or rack. Damaged or worn tips should be replaced, as they are a primary cause of stripped screws.

Building Your Toolkit

A good set of screwdrivers is a core part of any home improvement tool kit for beginners. While you can start with a basic multi-bit driver, having dedicated tools for common sizes is often more convenient and durable. Your screwdrivers will work alongside other essential hand tools like hammers, pliers, and a utility knife. For more specialized fastening tasks, explore the broader range of DIY tools available.

FAQ

What’s the most common screwdriver size I should own?

For Phillips drives, a #2 (PH2) is the most versatile for general household tasks. For slotted screws, a medium-width blade (around 1/4″) is useful. However, owning a small set that includes PH1, PH2, a few slotted sizes, and common Torx sizes (like T15 and T25) will cover a vast majority of DIY projects.

Why does my screwdriver keep slipping and stripping the screw?

This is almost always caused by using the wrong size or type of driver. Ensure the tip fits the screw head perfectly with no wiggle room. Worn-out, rounded driver tips are another common cause and mean the tool should be replaced. Also, remember to apply firm downward pressure as you turn to keep the driver seated.

Can I use a power drill instead of a screwdriver?

A cordless drill/driver is excellent for driving large numbers of screws quickly, especially with a clutch to prevent over-tightening. However, for delicate work, final tightening, or working with small screws, a manual screwdriver offers better control and feel to prevent damage. It’s best to have both.

What’s the difference between Phillips and Pozidriv?

They look similar, but Pozidriv has additional smaller lines between the main cross. The drivers are not fully interchangeable. Using a Phillips driver on a Pozidriv screw will likely result in poor contact, cam-out, and a stripped head. Always check your screw and use the exact driver type it requires.

How do I remove a stripped screw?

First, try using a rubber band between the driver tip and the stripped head for extra grip. Specialized extractor bits are designed to bite into stripped screws for removal. As a last resort, you can carefully cut a new slot into the screw head with a rotary tool and use a flathead driver, but this risks damaging the surrounding material. If the screw is critical or inaccessible, a professional may be needed.