
Omega Speedmaster watches are known for their timeless design and precision. For owners, customisation and maintenance are part of the appeal, and one of the most common adjustments is switching out the bracelet. This often requires the use of a specific-sized screwdriver to remove the bracelet's screws. The correct screwdriver size is essential to avoid damaging the screws and watch. While some sources suggest a 1.8mm or 2mm screwdriver, others recommend a 1.4mm blade for easy screw removal. Omega bracelet screws are typically end caps with pins inside, so it's crucial not to lose them during the process.
What You'll Learn
Screw size for attaching bracelet/strap to case
The screw size for attaching a bracelet or strap to the case of an Omega Speedmaster watch is 1.8mm. This is the size of the screwdriver required to remove the screws. The screws themselves are 1.50 mm in diameter and 21.00 mm in length.
The specific screw required depends on the model of the watch. For example, the Omega Steel Screw 124ST2798 is used to attach the bracelet or strap and claws to the case of the steel and two-tone steel and 18kt gold case 198.0155. The same screw is also used for the solid 18kt gold case, but with the model number 124BA2798.
Another example is the screw for attaching the Omega bracelet 1190/192 to the case 198.0024 and 198.0025. The screw for this is the OME-124ST2448.
It is important to use the correct size of screwdriver when removing screws from an Omega Speedmaster. Using a screwdriver that is too small can damage the slots in the screws.
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Screw size for bracelet links
The screw size for bracelet links on an Omega Speedmaster watch is quite small, measuring 1.40mm. This is the size of the blade on a compatible screwdriver. It is important to use the correct size when removing or tightening screws on an Omega bracelet to avoid damaging the screw heads.
Some bracelet screws are secured with Loctite, a type of adhesive, and may require the use of a heat gun to loosen them before attempting to turn the screw. This can be achieved with a hairdryer if a heat gun is not available.
The screws on an Omega bracelet are not typical screws but shallow caps that secure pins that go through the links. Therefore, it is important to be gentle when removing them to avoid losing the tiny pins inside.
When reassembling the links, ensure that the bearing sleeve inside the centre link is in place, as it can slide out during the process.
For the older Omega Speedmaster model that uses friction-fit pins instead of screws, a different tool is required for pushing the pins out and back in. This tool can be purchased from specialist watch tool shops or online retailers.
It is always recommended to use the correct tools and exercise caution when working on expensive watches like the Omega Speedmaster to avoid damage or losing small parts.
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Screw size for bracelet clasp
The screw size for an Omega Speedmaster bracelet clasp will depend on the model of the watch. For example, the current Speedmaster Pro model with screw-type bracelet (1958/957) requires a 1.8mm jeweller's screwdriver. The Omega Seamaster Planet Ocean Speedmaster band requires a 1.40mm screwdriver.
The screws on some bracelet clasps are just shallow caps that secure pins that go all the way through the links. Therefore, when removing the screw, the pin should drop out of the hole, and the links will be separated. It is important to note that the screws on your bracelet may be secured with Loctite, so a heat gun or hairdryer will be useful to break this down before attempting to remove the screw.
When purchasing a screwdriver, it is important to get one that is the correct shape, as well as the correct size. The screw head is curved, so the screwdriver should have a hollow ground curve, rather than a wedge shape, which could damage the screw head.
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Screwdriver size for bracelet screws
If you need to adjust the bracelet on your Omega Speedmaster, you'll need a jeweller's screwdriver that fits the slot in the screws. The correct size is important, as using a screwdriver that's too small can mangle the slots in the screws.
The correct size screwdriver for the bracelet screws on the Omega Speedmaster Pro with the screw-type bracelet (1958/957) is 1.8mm. This is also the correct size for the bracelet screws on the Aqua Terra 8500. You can purchase this screwdriver from Amazon or directly from the manufacturer.
If you have the current Speedmaster Pro model (311.30.42.30.01.005), a 1.8mm screwdriver is also the correct size. You'll want to use a watchmaker's screwdriver with a hollow-ground curve, rather than a wedge shape, to avoid damaging the screw heads.
It's worth noting that the screws on the Speedmaster bracelet are just shallow caps that are securing pins that go all the way through the links. After removing the screw with the correct size screwdriver, the pin should drop out of the hole.
Be careful not to lose the screws, as they are tiny!
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Bracelet number and bracelet body
The bracelet number of an Omega watch is stamped on the back of the bracelet. The complete bracelet number usually consists of seven digits, with the first four digits representing the bracelet body and the last three digits representing the end piece. However, sometimes only the first four digits are required to order parts.
For example, a bracelet number might look like this: 1503/825. In this case, "1503" refers to the bracelet body, and "825" refers to the end piece.
When ordering links and tubes for your Omega bracelet, it is essential to use the correct bracelet number to ensure you get the right parts.
Regarding bracelet bodies, it is worth noting that the removable links are located next to the clasp on both sides. These are the only links for which pins and tubes are available. Wider links on tapered bracelets, for instance, do not have available parts.
Additionally, it is important to know that ST Omega bracelets are made of stainless steel, while DA Omega bracelets are made of stainless steel and 18k gold.
Now, let's move on to the topic of bracelet screws. The size of the screwdriver you need for your Omega Speedmaster bracelet screws depends on the specific model you have. Most modern Omega watches with screw-type bracelets use a 1.8mm screwdriver. This includes the Speedmaster Pro with the screw-type bracelet (1958/957) and the Aqua Terra 8500.
You can purchase a suitable screwdriver from Amazon or a specialised retailer. It is recommended to choose a watchmaker's screwdriver that fits the screws properly to avoid damaging the screw heads.
Some bracelets have screws secured with Loctite, a thread-locking adhesive. In this case, it is advisable to use a heat gun or hairdryer to loosen the screws before attempting to remove them.
Remember to be cautious when handling the tiny screws, as they can be easily lost.
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Frequently asked questions
The bracelet screws for the Omega Speedmaster are 1.40mm.
You will need a 1.8mm jeweler's screwdriver to remove the bracelet screws. Be careful not to use a screwdriver that is too small, as it will damage the slots in the screws.
The screws on the bracelet do not go all the way through the links. They are shallow caps that secure pins that go through the links. After removing the screw, the pin should drop out. There is also a loose bearing sleeve inside the center link that the pin slides through, so be careful not to lose it when reassembling the links.