Doxa
Doxa Sub 300 Strap Size — 20mm Lug Width
The Doxa Sub 300 has a 20mm lug width, so it takes a 20mm watch strap.
Lug width20mm
| Lug width | 20 mm |
|---|---|
| Case size | 42.5 mm |
| Lug-to-lug | 45 mm |
| Thickness | 13.4 mm |
| Spring bar Ø (typical) | 2.0 mm |
| End type | Straight |
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 flush.
- Rubber / siliconeDivers & sports fit well.
- Milanese / meshStraight-end 20mm mesh fits.
- Metal braceletNeeds 20mm end-links shaped for this case.
▲ Beads-of-rice bracelet; 20mm.
Fit & sizing notes for the Sub 300
- 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, about 2.0mm diameter (spring bar sizes).
- Wrist fit: at 45mm lug-to-lug it should sit within the top of wrists from about 15.0cm up (rule of thumb: lug-to-lug under ~30% of wrist size). That's longer than 16% of the watches in our index. See what size watch suits your wrist.
- Strap thickness: at 13.4mm thick it's a chunky case: thicker padded leather, rubber/FKM or a heavier NATO balance it visually; very thin straps can look undersized.
Sources & corrections
Lug width from widely published specifications. Case sizes and references vary, so measure your own watch if anything looks different.
Spec wrong for your watch? Send us a correction with your reference number.
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Doxa Sub 300 — strap questions
What size strap does the Sub 300 take?
The Doxa Sub 300 has a 20mm lug width, so you need a 20mm watch strap.
Will any 20mm strap fit the Sub 300?
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. A metal bracelet needs 20mm end-links made for this model.
What spring bar size does the Sub 300 use?
20mm long and about 2.0mm in diameter (a typical figure; measure the original bar to be sure).
Is the Sub 300 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.