Rolex
Rolex Air-King Strap Size — 20mm Lug Width
The Rolex Air-King has a 20mm lug width, so it takes a 20mm watch strap.
Lug width20mm
| Lug width | 20 mm |
|---|---|
| Case size | 40 mm |
| Lug-to-lug | 49 mm |
| Thickness | 12 mm |
| Spring bar Ø (typical) | Not confirmed |
| End type | Fitted ends best |
Strap styles that fit
- NATO / Zulu20mm fits if the strap's thickness clears the case under the bars.
- PerlonWoven pass-through, 20mm.
- 2-piece leatherStraight ends fit; curved ends for a gapless look.
- Rubber / siliconeDivers & sports fit well.
- Milanese / meshStraight-end 20mm mesh fits.
- Metal braceletNeeds 20mm end-links shaped for this case.
▲ Most sources list 20mm (one database says 20.5mm); 20mm straps are the right size.
Fit & sizing notes for the Air-King
- Width: buy 20mm straps. Tapered straps listed as 20/18mm or 20/16mm fit too; only the first number has to match. See strap sizes explained.
- Spring bars: 20mm long. We haven't confirmed the diameter for this model, so measure the old bar before buying replacements (spring bar sizes).
- Ends: the case curves between the lugs, so curved or fitted-end straps close the gap. Straight-end straps still fit.
- Wrist fit: at 49mm lug-to-lug it should sit within the top of wrists from about 16.3cm up (rule of thumb: lug-to-lug under ~30% of wrist size). That's longer than 81% of the watches in our index. See what size watch suits your wrist.
- Strap thickness: at 12mm thick it's mid-thickness, so most straps suit it; padded leather and NATOs both balance well.
Sources & corrections
Lug width checked against: Bernard Watch: Air-King 126900; WatchBase: 126900-0001. Last checked 24 October 2026.
Spec wrong for your watch? Send us a correction with your reference number.
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Rolex Air-King — strap questions
What size strap does the Air-King take?
The Rolex Air-King has a 20mm lug width, so you need a 20mm watch strap.
Will any 20mm strap fit the Air-King?
Most will. Width is the main thing to match, but also check that the strap's spring-bar holes suit the bars, and that the strap is thin enough to clear the case between the lugs. For a gapless look, pick curved/fitted ends. A metal bracelet needs 20mm end-links made for this model.
What spring bar size does the Air-King use?
20mm long. We haven't confirmed the diameter for the Air-King, so measure the original bar with calipers before buying replacements.
Is the Air-King good for strap swapping?
Yes. With standard 20mm spring-bar lugs, NATO, leather, rubber and mesh straps can all be fitted with a spring-bar tool.