What Is a Nut Driver and What Is It Used For?
A nut driver is a hand tool that looks like a screwdriver but has a hex socket at the tip instead of a blade. It turns hex nuts and hex-head bolts and screws, mostly in light-torque jobs where speed and control matter more than raw force. You hold it like a screwdriver, which makes it quick to use in places where a wrench is awkward.
WORKPRO W003163Best overall
AMM YMX117Compact magnetic driver set
Olympia Tools 86-513Hollow shaft, SAE basicsWhat a nut driver is
A nut driver is a handle with a shaft and a small socket on the end. The socket is shaped to fit a hex nut or a hex-head fastener. Each driver fits one size, so you usually buy them as a set.
Think of it as a screwdriver and a socket combined. You get the straight, hand-held grip of a screwdriver with the turning surface of a socket. That makes it easy to spin a fastener quickly with one hand.
Sets come in two sizing systems. SAE drivers use fractions of an inch, such as 3/16 in or 1/2 in. Metric drivers use millimeters. A driver only fits when the size matches the fastener, so check which system your project uses.
How a nut driver works
The hex socket slips over the outside of a nut or bolt head and grips all six flats. When you turn the handle, the force goes through the shaft and into the fastener. Because the socket surrounds the nut, it holds on better than a flat blade would.
The handle is thicker than a typical wrench grip, so you can spin it with your fingers and palm. That gives good feel. You can sense when a nut seats, which helps you avoid overtightening.
Some drivers have a hollow shaft. This is a channel running through the middle of the tool. If a nut sits on a long threaded rod, the rod can pass up through the shaft, so you can reach a nut far from the end. Olympia's 7-piece set and both Klein Tools sets on our spec sheet list a hollow shaft.
Other drivers have a magnetic tip. The magnet holds the nut or bolt in the socket so it does not drop when you work in a tight spot. WORKPRO and AMM list magnetic tips.
What a nut driver is used for
Nut drivers shine on small and mid-size hex fasteners that do not need heavy torque. They are common in electrical work, appliance repair, HVAC panels, hobby projects and light automotive tasks.
Here are some typical jobs:
- Removing and refitting hex-head sheet metal screws on panels and covers
- Tightening hex nuts on threaded rod or long bolts, using a hollow shaft
- Working on small engines, bikes and light equipment
- Assembling shelving, brackets and hardware with hex nuts
- Reaching a nut in a recessed spot where a wrench will not swing
Nut driver vs. wrench, socket and screwdriver
It helps to know where a nut driver fits next to other tools. A wrench and socket set can usually deliver more force. A nut driver is faster and gentler for small fasteners.
Our nut driver set comparison puts both hand drivers and drill-ready sets on one spec sheet, so you can see how the two styles differ.
| Tool | Best for | Limits |
|---|---|---|
| Nut driver | Quick turning of small hex fasteners with good feel | Not meant for high torque or stuck bolts |
| Socket and ratchet | Higher torque and rusted or large fasteners | Slower to spin by hand, needs space for the handle |
| Open or box wrench | Fasteners with no clear top access | Needs room to swing, takes more steps to turn |
| Screwdriver | Slotted and Phillips screws | Does not fit hex nuts |
Types of nut drivers
Not every nut driver is the same. The main differences are in the handle and the drive style.
Fixed-handle hand drivers are the classic type. Olympia's set and both Klein sets on our page are of this style. They are simple and give direct feel for light work.
Drill-ready nut drivers use a 1/4" hex shank, so they fit a drill or impact driver. WORKPRO and AMM list this shank. It speeds up repetitive work, such as running many sheet metal screws.
Ratchet-style options add reach and control. WORKPRO is the only set on our page that lists a ratchet handle, and it also lists a 72-tooth mechanism.
How to use a nut driver safely
Using one is simple, but a few habits protect both you and the fastener.
Follow these steps:
- Match the driver to the fastener. The socket should slide on snugly with little wobble.
- Seat the driver fully over the nut or bolt head before you turn.
- Turn with steady pressure and keep the tool in line with the fastener.
- Stop when the nut feels snug. Hand drivers are made for light torque.
- Do not use a hand nut driver as a pry bar, chisel or hammer.
Safety notes and set choice
If you use a drill-ready driver in a power tool, wear safety glasses. A fastener or a worn tip can slip and fly. Impact tools are loud, so use hearing protection too. Always switch off and unplug or disconnect power before you work on anything electrical or any equipment with moving parts. Never work on live wiring with a metal-shaft tool.
Do not use a nut driver on a fastener that is rusted or very tight. Use a proper socket and wrench instead, so you do not round the nut or hurt your hand.
When you pick a set, count drivers, not total pieces. On our spec sheet, WORKPRO lists 98 pieces but 45 nut drivers, while AMM lists 39 pieces and 34 nut drivers. A 7-piece set of seven drivers gives you fewer sizes but little else to sort through.
Think about size range too. Olympia's set and the Klein 631 each run from 3/16" to 1/2", and Klein 65456 runs from 1/4 in to 9/16 in. If you need both inch and millimeter sizes, the two sets that list both systems are WORKPRO and AMM. Our best nut driver set page lays out each option side by side.
Frequently asked questions
Is a nut driver the same as a socket?
No. A socket is a separate piece that attaches to a ratchet or extension. A nut driver has the socket built into a handle, so you turn it like a screwdriver.
Can I use a nut driver in a drill?
Only if it has a 1/4" hex shank made for drills or impact drivers. Fixed-handle hand drivers are not designed for that and should stay hand tools.
Why do some nut drivers have a hollow shaft?
The hollow center lets a threaded rod or long bolt pass through, so you can reach a nut that is far from the end without removing the whole rod.
Do I need metric or SAE nut drivers?
It depends on your fasteners. SAE sizes are fractions of an inch and metric sizes are in millimeters. Check the nut or bolt you work on, or buy a set that covers both.