Can a Watch Winder Magnetize Your Watch?

How a Watch Winder Actually Works

Before we talk magnets, let's quickly look at what a winder is doing inside that little box on your dresser.

A watch winder is a motorized device that rotates a watch in specific patterns — clockwise, counter-clockwise, or a combination of both — to mimic the motion of a wrist. This keeps the automatic rotor inside the movement turning, which keeps the mainspring wound.

Inside nearly every winder, you'll find:

• A small electric motor (usually DC, occasionally stepper)
• A gearbox to reduce speed
• A microcontroller that controls the turn pattern
• A watch holder / pillow that grips the timepiece

The motor is the only part of this system that has any real potential to generate a magnetic field — and that's where the concern starts.

Where the Magnetic Risk Comes From

one things inside a winder can produce magnetic fields:

The Motor Itself

Most watch winders use small brushed DC motors because they're cheap, quiet, and easy to control. Inside these motors are permanent magnets (often neodymium-based) and electromagnetic coils. When the motor runs, it produces a localized magnetic field around the motor housing.

The strength of that field depends on the motor type, size, and — critically — how close the watch sits to the motor.

The Real Question: Is the Field Strong Enough to Magnetize a Movement?

A mechanical watch movement is considered magnetized when the hairspring — the tiny coiled spring that regulates the watch's rate — picks up enough residual magnetism to stick to itself. Even a small amount (as little as under certain conditions, depending on the movement) can cause it to run fast, sometimes by several seconds to several minutes per day.

Now, here's the practical reality:

• Higher-quality motors with improved shielding generate very weak external fields because their magnetism is tightly contained in the rotor and stator.

Cheap brushed DC motors can leak more field, especially along the motor's axis. A watch mounted just 1–2 cm above such a motor can see a measurable field.

Bottom line: A poorly designed winder — especially one with a cheap motor mounted too close to the watch holder — can magnetize a watch. A well-designed winder, with the motor properly shielded and the watch held mechanically (not magnetically), is essentially safe.

The Bigger Magnetic Risks Most Collectors Miss

Here's the part that surprises people: even if you stopped using a watch winder entirely, your watch would still be exposed to magnetic fields every single day.

The real common sources of watch magnetization include:

• Smartphones and tablets (especially when the watch is resting on top of them)
• Laptop computers (the magnets in the lid closure, speakers, and hard drives)
• Headphones and speakers (especially over-ear cans and Bluetooth speakers)
• Magnetic clasps on bags, wallets, and watch rolls
• Refrigerator magnets and magnetic knife strips
• MRI machines and induction cooktops (extreme sources, but worth noting)
• Tablet cases with smart covers (the cover magnet is often right next to the watch)

If you carry your iPhone in the same pocket as your Rolex, or toss your Omega on top of your laptop to grab your keys, you're exposing it to far stronger fields than any quality winder would.

How to Tell If Your Watch Is Magnetized

The good news: magnetization is one of the easiest watch problems to fix — but only if you catch it.

Signs your watch is magnetized:

1. It's running noticeably fast — seconds to minutes per day, when it was previously accurate
2. It runs fast on the dial-down position but normal in other positions
3. The seconds hand "sticks" or stutters when you move the watch around
4. A watchmaker confirms it with a magnetometer

If you notice any of these, don't panic. Move to the next section.

How to Demagnetize a Magnetized Watch

There are three reliable ways:

1. A Professional Demagnetizer (Best)

A watchmaker's demagnetizer is a small handheld device you plug in. Place the watch on top, press the button, and slowly move the watch away. The device emits a decaying alternating magnetic field that randomizes the residual magnetism in the hairspring. Takes 5 seconds. Costs $20–50 for a home unit.

2. A Watchmaker Visit (Safest)

Any competent watchmaker can demagnetize your watch in seconds. It's a routine service, often free if you're already having the watch serviced.

3. DIY (Not Recommended)

There are YouTube tutorials using soldering irons, old hard drives, and other household items. These are unreliable and can damage the movement. Spend the $25 on a real demagnetizer.

How to Choose a Watch Winder That Won't Magnetize Your Watch

Whether you're shopping for your first winder or replacing an old one, here's what to look for:

• Motor type — Prefer stepper motors and mabuchi motors over cheap brushed DC motors. They're quieter, more precise, and produce less stray magnetic field.
• Shielding and distance — A good winder mounts the motor in the base, below the watch holder, and uses a metal or mu-metal shield between the motor and the watch compartment. The further the movement is from the motor, the safer it is.
• Build quality and brand reputation — Buy from a brand that understands the problem. This is exactly why Rotelux designs its winders with sealed motor compartments, mechanical watch holders, and mabuchi motors — the engineering matters when you're entrusting it with a $5,000+ timepiece.

• Very cheap winders (under $30) with no brand reputation
• Winders where the motor is directly below the watch with no shielding
• No mention of motor type or anti-magnetic design in the product description