When to Use a Nut Driver Instead of a Screwdriver

How a nut driver differs from a screwdriver

A screwdriver works by fitting a tip into a recess in the fastener head. A nut driver works the other way around. It has a hollow hex socket at the end of a shaft, and that socket slides over the outside of a hex nut or hex-head bolt.

That difference matters for grip. A screwdriver tip touches only a small area inside the recess, so it can slip or strip the head. A nut driver wraps around all six flats, which spreads the turning force and lowers the chance of rounding the corners.

Nut drivers also feel different in the hand. The handle is usually thicker and the shaft is short and stiff, so you can push straight down while turning. That makes them comfortable for quickly running a fastener in or out.

When a nut driver is the better choice

Reach for a nut driver any time the fastener is a hex nut or a hex-head screw. These show up on appliances, HVAC panels, electrical boxes, hose clamps, lawn equipment, bike accessories and many automotive brackets.

A nut driver is also the better tool when you want speed and control without a full socket wrench. You can spin it by hand, feel when the fastener seats, and stop before you overtighten. For small hardware, that feel is often more useful than raw leverage.

These are the jobs where a nut driver tends to make sense:

• Hex-head sheet metal screws on ducts, panels and enclosures
• Hex nuts on threaded studs where a screwdriver has nothing to grip
• Hose clamps with hex heads
• Repeated fastening where a drill-ready driver saves effort
• Tight spots where a magnetic tip helps hold a small nut in place

When a screwdriver is still the right tool

A nut driver cannot do anything with a slotted, Phillips or Torx head, so those stay with screwdrivers or bits. A nut driver also will not fit a hex nut that is recessed deep in a hole narrower than the socket.

Some jobs call for something else entirely. High-torque work on large bolts is better handled by a socket and ratchet or a wrench, since a nut driver handle is built for light to moderate turning. If you only need to turn a screw with a recess, a screwdriver is simpler.

A screwdriver should never be used as a stand-in for a nut driver on a hex nut. Jamming a flat tip against the corners of a nut usually damages the nut and can slip out suddenly.

Quick comparison by situation

This table sums up the choice for common fasteners.

What to look for in a nut driver set

If you decide a nut driver belongs in your toolbox, a few features decide which set suits you. Our best nut driver set page puts five products on one spec sheet so you can compare them directly.

First, match the sizing system. SAE sets use fractions of an inch and metric sets use millimeters. In our lineup, WORKPRO and AMM list both systems, while the Olympia Tools set and the two Klein Tools sets are SAE only.

Second, count the drivers, not the total pieces. WORKPRO lists 98 pieces but 45 of them are nut drivers, and AMM lists 39 pieces with 34 nut drivers. The rest are bits and adapters. A small hand set can still be the right choice: the Olympia Tools set has 7 drivers from 3/16 in to 1/2 in, and the Klein Tools 65456 has 6 from 1/4 in to 9/16 in.

Third, think about the features that suit your jobs. Magnetic tips, listed for WORKPRO and AMM, help hold a nut on the driver. A hollow shaft, listed for the Olympia Tools and both Klein Tools sets, lets a threaded rod pass through so you can reach nuts far from the rod's end. No set in our lineup lists both features.

Finally, consider how you will drive it. WORKPRO and AMM use a 1/4 in hex shank that fits a drill or driver, and WORKPRO adds a ratchet handle. The fixed-handle sets are hand tools only. For weight, the Klein Tools 631 is listed at 1.8 lb, the lowest in the lineup, while the WORKPRO set is listed at 6.97 lb because it includes so many pieces.

Using a nut driver the right way

Good technique protects both the fastener and your hands. Follow these steps:

• Pick the size that slides onto the nut with only a little play. A loose fit rounds corners.
• Seat the socket fully over the nut or bolt head before you turn.
• Keep the shaft in line with the fastener and push lightly while turning.
• Start by hand so you can feel the threads catch, then speed up if you use a drill.
• Stop when the fastener is snug. Finish with a wrench if a spec calls for a set torque.

Safety notes

Always turn off and unplug electrical equipment before you open a panel, and confirm the power is off with a proper tester. Many hex-head screws hold covers on live electrical boxes and appliances. Use insulated tools only if they are rated for the job, and do not assume a standard nut driver is insulated.

If you use a drill-ready nut driver, wear eye protection. A nut driver can slip off a fastener, and chips or small hardware can fly. Use a low speed to start, keep your free hand clear of the bit, and wear hearing protection if you are using impact tools for longer jobs.

Be careful around gas appliances and fittings. Do not loosen gas connections with a nut driver. Leave that work to a licensed professional. When working at a height, set your ladder on firm ground and keep a hand free for balance rather than reaching with the tool.

Frequently asked questions

Can I use a socket instead of a nut driver?

Often yes. A socket on a ratchet grips the same hex shapes and gives more leverage. A nut driver is quicker for light work and easier to spin by hand.

What is a hollow shaft nut driver for?

The open center lets a long threaded rod or bolt pass up through the driver. You can tighten or loosen a nut far from the rod's end without removing the rod.

Do I need metric and SAE nut drivers?

It depends on what you work on. Many modern appliances and imported equipment use metric fasteners, while older US-made gear often uses SAE. A set with both avoids guessing.

Can I put a nut driver in a drill?

Only if it has a hex shank made for it, such as the 1/4 in hex shank listed for WORKPRO and AMM. Do not chuck a fixed-handle hand driver into a drill.