Omega Spring Bars 21mm — Single Diameter
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€12,95
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Handcrafted Straps
Omega Spring Bars 21mm — Single Diameter
€12,95
Set of two Omega 21mm spring bars in hardened Swiss Standard steel. Pin diameter: 1.8mm. Sized for contemporary Omega watches with lugs slightly wider than the standard 20mm: Seamaster Diver 300m 42mm, Seamaster Planet Ocean 42mm, certain Constellation Globemaster variants.
The 21mm Omega is a transitional geometry between the classic 20mm and the 22mm of heavy sports models. It appears on 42mm models where Omega sought a slightly more pronounced presence on the wrist. Pin 1.8mm — the Omega standard remains unchanged even on this intermediate size. It is the exact specification for the Seamaster 42mm: aftermarket 20mm bars will not fit correctly here.
The same spring bars I use on clients’ 21mm Omega watches. The same supplier.
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Free shipping Italy
24/48h delivery
30-day return
Free from Italy only
Atelier since 1984
Milan
Swiss Standard steel
316L · 10,000 cycles
SKU: MS-IT-MS-OMSB-NV-1821
Worldwide shipping
I prepare and ship your order within 1–3 business days of payment. Delivery takes 1–3 business days in Italy, 3–7 in the European Union, 5–10 in the United States and Canada, and 7–15 to the rest of the world. Every parcel is tracked.
Returns and exchanges
You have 30 days from delivery to request a return or an exchange. The strap must come back as you received it: unworn, in its packaging. Write to info@milanostraps.it with your order number; once the return is accepted, I will send you the return shipping label. Made-to-measure straps cannot be returned: they are cut for your watch. Full conditions.
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Orologi compatibili
The joy of little things
Changing your strap should be as simple as changing your shoes. With us, it is.
Every strap has integrated quick-release spring bars: swap it in one gesture, no tools, no risk of scratching the lugs. The same watch shifts mood with the moment.
Frequently asked questions
Is the 21mm Omega compatible with my 42mm Seamaster? What if I have an older model?
Yes, it was designed specifically for contemporary Seamaster Diver 300m and Planet Ocean 42mm watches. If you have a Seamaster from the 1990s-2000s, it is most likely a standard 20mm — measure the lugs or check the documentation. The 21mm does not fit into 20mm lugs by forcing it.
What is the concrete difference between the classic 20mm and this 21mm? Is it worth switching?
It is a transitional geometry: the 21mm takes up a slightly wider space between the lugs, giving a more natural proportion on 42mm cases. If your 20mm strap shifts laterally or feels undersized on the wrist, the 21mm removes that play. It is not a revolution, but it changes the aesthetic perception.
Is the pin 1.8mm like the other Omega ones? Is there a risk of compatibility with other straps?
Yes, standard Omega 1.8mm pin — it stays the same even on the 21mm. You can use these spring bars with any Omega strap that accepts 1.8mm. One thing to note, though: the 21mm will not fit 20mm lugs, so the limit is the width of the lug, not the pin.
How do I know if my lugs are really 21mm or only slightly different from 20?
Measure the internal distance between the two lugs with a digital calliper — it needs to be exactly 21mm. If it's between 20 and 20.5mm, stick with the standard 20mm. If it's a clean 21mm, these are the ones for you. If in doubt, before buying take a photo of the measurement: I can tell you if it matches.