Casio
Casio F-105W Strap Size — 18mm Lug Width
The Casio F-105W has a 18mm lug width, so it takes a 18mm watch strap.
Lug width18mm
| Lug width | 18 mm |
|---|---|
| Case size | — |
| Lug-to-lug | — |
| Thickness | — |
| Spring bar Ø (typical) | Not confirmed |
| End type | Straight |
Which reference do you have?
Similar-looking models can take different straps. Your reference number is on the case back or your papers.
| Model | Case | Strap |
|---|---|---|
| F-105W | — | 18mm |
| F-91W | 35mm | 18mm |
Strap styles that fit
- NATO / Zulu18mm fits if the strap's thickness clears the case under the bars.
- PerlonWoven pass-through, 18mm.
- 2-piece leatherStraight ends fit flush.
- Rubber / siliconeDivers & sports fit well.
- Milanese / meshStraight-end 18mm mesh fits.
- Metal braceletNeeds 18mm end-links shaped for this case.
▲ Takes the same 18mm Casio resin strap as the F-91W.
Fit & sizing notes for the F-105W
- Width: buy 18mm straps. Tapered straps listed as 18/16mm or 18/14mm fit too; only the first number has to match. See strap sizes explained.
- Spring bars: 18mm long. We haven't confirmed the diameter for this model, so measure the old bar before buying replacements (spring bar sizes).
Sources & corrections
Lug width checked against: Esslinger: genuine Casio F105 strap. Last checked 24 October 2026.
Spec wrong for your watch? Send us a correction with your reference number.
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Casio F-105W — strap questions
What size strap does the F-105W take?
The Casio F-105W has a 18mm lug width, so you need a 18mm watch strap.
Will any 18mm strap fit the F-105W?
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 18mm end-links made for this model.
What spring bar size does the F-105W use?
18mm long. We haven't confirmed the diameter for the F-105W, so measure the original bar with calipers before buying replacements.
Is the F-105W good for strap swapping?
Yes. With standard 18mm spring-bar lugs, NATO, leather, rubber and mesh straps can all be fitted with a spring-bar tool.