Eternal Tools complete guide to Watchmakers Screwdrivers

If you are going to start working on watches then one of the first things that you need to consider purchasing is a good premium set of watchmakers screwdrivers.

High quality watchmakers' screwdrivers will last you for many years and will be a worthwhile investment. They are the one tool, along with your tweezers and eyeglass that you will use all the time.

Until I began in the world of watchmaking I didn't realise just how complicated selecting a set of watchmakers screwdrivers could be. In this article, I'm going to break down everything you need to know about screwdrivers for watch repair so that you don't end up purchasing the wrong tools and ultimately find yourself wasting time and money.

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Why Are Good Watchmakers Screwdrivers So Important?

It's common practice when somebody decides that they want to take apart a wristwatch to just purchase the cheapest set of small screwdrivers they can find. The majority of these are made in either India or China and although they may look OK at first glance, or seem amazing value, as soon as you start using one of the screwdrivers you will start to realise why they were so cheap.

Cheap watchmaker's screwdrivers tend to have imperfections that you will not find in a higher quality set of screwdrivers. For example, the screwdriver blades are often made of a very soft metal so they lose their profile very quickly resulting in slippage and damaging of screwheads. They also lack a decent action on the top of the handle so when used don't glide and rotate smoothly like more superior quality ball-bearing based handles.

These differences may be acceptable in larger tools but when working on delicate parts often smaller than 1mm it's vital to have good control and precision quality.

Let's begin by breaking down the parts of the watchmaker's screwdriver to understand what really matters.

Horotec screwdrivers from Eternal Tools

The Money Is In The Handles

The most expensive part of the watchmaker's screwdriver is the handle. The ends are usually universally coloured with color-coded hex heads so you can quickly identify which screwdriver size you are working with. All the top brands use the same colour coding system:

  • Brown screwdriver - 2.00 mm
  • Blue screwdriver - 2.50 mm
  • Green screwdriver - 2.00 mm
  • Violet screwdriver - 1.60 mm
  • Grey screwdriver - 1.40 mm
  • Red screwdriver - 1.20 mm
  • Black screwdriver - 1.00 mm
  • Yellow screwdriver - 0.80 mm
  • White screwdriver - 0.60 mm
  • Orange screwdriver - 0.50 mm

The number next to the colour refers to the blade width in millimetres.

Good watchmakers' screwdriver handles will have a hexagonal end piece, this is to ensure that they do not roll when put down on the bench.

Image courtesy of taylorhorology

An ergonomic screwdriver has a handle usually made from stainless steel and knurled. 

Knurled handles produce a shaft that has a better grip on its surface. In recent years an ergonomic handle has been produced that offers a rubberised coating onto the shaft of the handle but the general consensus is that these are best left alone as they "desensitize the true feel" of the screwdriver.

Finally, all good watchmakers' screwdrivers will have swivel heads. A ball-bearing swivel action on the top piece of the screwdriver handle enables this action. This is vital when working on delicate parts because anything short of a smooth rotation as you screw or unscrew could result in a slip and a slide off the screw and onto more important watch parts.

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Selecting The Best Screwdriver Blades

flat screwdriver blades

Now let's look at the blades themselves. The screwdriver blade is the working end and needs to be kept in "tip-top" condition at all times. 

No matter what watchmakers screwdriver set you purchase you will have to re-dress and resharpen the blades on a regular basis. 

Always keep a few spare blades to hand as well for when the re-sharpened ones inevitably need replacing.

spare blades for screwdrivers

In the top image you will notice the tiny grub screw that is used to hold the blade in position. It is by loosening and tightening these small screws that you can replace your screwdriver blades

In cheap screwdrivers, you will notice that this small grub screw often fails to grip the replaceable blades correctly causing the blade to rotate during use. Not great when screwing and un-screwing!

The quality of the metal used for the blades will make your life much easier. Very soft blades will simply twist and deform under pressure and not hold their profile. Simply put you will be sharpening your screwdrivers more than using them. Always opt for high-quality stainless steel blades.

Screwdriver blades need to be of very good quality because the torque that is generated through such a small tip is very high.

Due to huge variations in watch screws, screwdriver blades will often have to be reshaped for different watches and their screws.

Selecting the correct sized screwdriver that is the same width as the screw slot is vital to avoid damaging both the screw head and the surrounding areas of the screw.

Do You Need A Stand For Your Screwdrivers?

When purchasing your watchmaker screwdrivers you will have the choice of whether to purchase an individual screwdriver as a set in a rotating stand, a wooden box or a plastic wallet. A 4, 5 or 6 piece screwdriver set of the most popular sizes should see you through most jobs.

The choice is really yours here as the packaging doesn't affect the quality of the screwdrivers themselves. 

Precision screwdrivers in stands are often good to keep all the screwdrivers together for easy selection and usually come with a collection of replacement blades inside the stand. 

Watch screwdrivers in plastic wallets are often cheaper due to the material costs of the packaging.

6 piece sset of horotec screwdrivers in a stand

Should You Buy A Set or Individual Screwdrivers?

You will also find that you can purchase your watchmakers screwdrivers either as a set or as individuals. Many sets are often too large and a waste of money, they include screwdriver sizes that are too large and rarely used.

The most common watchmakers screwdriver sizes that I use and I think you will find most people use are:

  • Violet - 1.60 mm
  • Grey - 1.40 mm
  • Red - 1.20 mm
  • Black - 1.00 mm
  • Yellow - 0.80 mm

For working on some pocket watches you may need a slightly larger size but for wristwatches, these sizes are very popular.

So purchasing a set of 10 or more watchmakers screwdrivers in a set is often a waste of money. For many people just purchasing these 5 screwdrivers but in the best quality they can afford would be a wiser investment.

Screwdrivers with flat head blades are the most common, but you may also see on your search t-shaped screwdrivers, often referred to as parallel blade screwdrivers, as well as Phillips screwdrivers, the ones with the cross head.

Parallel, phillips and flat head screwdriver blades

The 2 Best Watch Screwdriver Brands

There are 2 screwdriver brands that I can recommend and they are Swiss/French made.

  • Horotec 
  • Bergeon

The above brands will supply you with a long lasting, superior quality product that you will be happy with. Both Bergeon and Horotec are roughly the same prices.

In my opinion Horotec is a slightly better product and you can really feel the quality when you use them. I own a set of both Horotec and Bergeon screwdrivers and I find I mostly use the Horotec ones because I like the way they feel.

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Making The Right Buying Decision

So now you have a better understanding of watchmakers screwdrivers you should be able to better decide which screwdrivers are for you.

In my opinion you should always buy the best quality screwdrivers you can afford. A good set of watchmakers screwdrivers will last you for many years and become something that you treasure. If you are buying them as a gift then a set of screwdrivers in different sizes displayed and stored in a nice quality wooden case is a lovely present. They usually come with extra blades and small screws for replacing.

If you cannot afford to purchase a full set of screwdrivers then just purchase the most popular sizes and get the rest when you can afford them.

Using good tools is always a pleasure. Trust me!