Updated October 2026 · By the BGStraps team
Quick answer: to adjust an Omega bracelet, first use the micro-adjustment on the clasp for small changes. For bigger changes, remove links from both sides of the clasp equally. Most modern Seamaster and Speedmaster bracelets use screwed links, which you undo with a precision flat-blade screwdriver that fills the slot. A good fit lets one finger slide under the bracelet.
A new Omega almost never fits perfectly out of the box. The bracelet is supplied long so it will fit the largest wrist, and it’s up to you or the boutique to size it. The good news is that Omega bracelets are among the easiest to adjust at home, as long as you know what kind of link system you’re dealing with and you have the right screwdriver. This guide covers the Seamaster, Speedmaster and Constellation, plus the questions we’re asked most.
Step 1: Try the clasp first
Always start with the clasp, because it may give you all the adjustment you need. Most Omega clasps have a row of small holes on each side. The spring bar that holds the bracelet to the clasp can be moved between them, which shifts the length by a few millimetres at a time. Push the spring bar in with the fork of a spring bar tool, move it to the next hole and let it click into place.
Many recent Omega models also have a built-in extension inside the clasp that you can open without tools. It’s handy on hot days, or on the Seamaster when you want to wear the watch over a wetsuit. If the clasp alone doesn’t give a comfortable fit, move on to removing links.
Step 2: Check whether your links use screws or pins
Look at the side of the removable links, the ones closest to the clasp. The link system decides which tool you need:
| What you see on the side of the link | System | Tool |
|---|---|---|
| A slotted screw head | Screwed link (most modern Seamaster and Speedmaster bracelets) | Precision flat-blade screwdriver |
| A plain round hole, often with an arrow on the inside of the link | Friction pin (common on older and aftermarket bracelets) | Pin pusher or a small punch, plus a soft hammer |
| No visible fixing | Integrated or concealed system (such as the Constellation) | Best left to a watchmaker |
Step 3: Choose the right screwdriver
The right screwdriver is the one whose blade fills the whole width of the slot without being wider than the screw head. For Omega bracelets that’s usually a precision flat-blade in roughly the 1.0 to 1.6mm range, but check it against your own bracelet. A blade that’s too small will twist in the slot and damage the screw, and one that’s too wide will scratch the link. Always turn anticlockwise to loosen.
Some factory screws are fitted with a small amount of thread-locking compound. If a screw won’t move with firm, even pressure, stop rather than force it. A watchmaker can free it without damaging the head.
Step 4: Remove links evenly
- Put the watch on and pinch the bracelet together at the back of your wrist to see how many links are extra.
- Take the same number of links from each side of the clasp, so the clasp stays centred under your wrist. If you need an odd number, take the extra link from the six o’clock side.
- Lay the watch on a soft cloth, support the link and undo the screw, or push out the pin in the direction of the arrow.
- Rejoin the bracelet, refit the screw or pin and tighten it firmly, but don’t overdo it.
- Try the watch on and fine-tune the fit with the clasp holes.
Keep the spare links and screws together in a small bag. You’ll need them if you sell the watch, or if your wrist size changes in summer.
Model notes
Seamaster Diver 300M and Planet Ocean
Current Seamaster bracelets use screwed links and a diver’s clasp with a built-in extension, so the right screwdriver is the key tool. The polished centre links on the Diver 300M mark easily, so work slowly on a soft surface. If you’re replacing a worn bracelet rather than resizing it, our bracelet for the new Seamaster 300 and 21mm bracelet for the 43.5mm Planet Ocean come ready to size.
Speedmaster
The adjustment method depends on the bracelet’s generation. Recent Moonwatch bracelets use screwed links and a clasp with micro-adjustment, while older bracelets may use pins. Check the side of the link before you pick a tool. Many Speedmaster owners find a strap more comfortable than resizing an old bracelet: see our Speedmaster strap guide.
Constellation
The Constellation’s integrated bracelet flows straight out of the case, and its links and clasp are more complex than a sports bracelet. We recommend letting a boutique or watchmaker size it. If you want a replacement, see the steel bracelet for the Omega Constellation.
Milanese mesh
Mesh bracelets have no links to remove. They adjust at the sliding clasp, which moves along the mesh and locks in place. That makes the Milanese mesh bracelet for the Seamaster one of the easiest bracelets to size at home.
DIY or boutique?
| Do it yourself | Boutique or watchmaker | |
|---|---|---|
| Cost | The price of a screwdriver | Often free if they sold you the watch; otherwise a small fee |
| Time | 10–20 minutes | Usually while you wait |
| Risk | Scratches or a damaged screw head if the tool is wrong | Minimal |
| Best for | Screwed and pinned sports bracelets | Integrated bracelets, stuck screws, vintage bracelets |
Policies vary by country and store, so it’s worth asking before you go. For everything else about Omega straps and bracelets, start with our complete guide to Omega replacement straps, or browse all Omega bracelets.
Frequently asked questions
How do I adjust an Omega Seamaster bracelet?
Use the clasp’s built-in extension or micro-adjustment holes for small changes. For bigger changes, undo the link screws with a precision flat-blade screwdriver and remove the same number of links from each side of the clasp.
What size screwdriver do I need for an Omega bracelet?
A precision flat-blade screwdriver whose tip fills the slot, usually in the 1.0 to 1.6mm range. Check it against your bracelet: the blade should fill the slot without overhanging the screw head.
How do I remove links from an Omega Speedmaster bracelet?
Check the side of the link. A slotted head means a screw, which you undo anticlockwise. A plain hole means a pin, which you push out in the direction of the arrow on the inside of the link.
Do Omega bracelets have micro-adjustment?
Most do, through small holes in the clasp where the spring bar can be moved. Many recent models also have a tool-free extension built into the clasp.
Will an Omega boutique resize my bracelet?
Usually yes, and often at no charge for watches they sold. Policies vary by country and store, so ask before you visit.
How tight should an Omega bracelet be?
Snug but not tight. You should be able to slide one finger under the bracelet, and the watch shouldn’t slide down onto your hand.