Hamilton
Hamilton Khaki Field Auto 42 Strap Size — 22mm Lug Width
The Hamilton Khaki Field Auto 42 has a 22mm lug width, so it takes a 22mm watch strap.
Lug width22mm
| Lug width | 22 mm |
|---|---|
| Case size | 42 mm |
| Lug-to-lug | 52 mm |
| Thickness | 11 mm |
| Spring bar Ø (typical) | 2.0 mm |
| 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 |
|---|---|---|
| Khaki Field Day Date Auto 42 (H70535) | 42mm | 22mm |
| Khaki Field Mechanical 38 | 38mm | 20mm |
Strap styles that fit
- NATO / Zulu22mm fits if the strap's thickness clears the case under the bars.
- PerlonWoven pass-through, 22mm.
- 2-piece leatherStraight ends fit flush.
- Rubber / siliconeDivers & sports fit well.
- Milanese / meshStraight-end 22mm mesh fits.
- Metal braceletNeeds 22mm end-links shaped for this case.
Fit & sizing notes for the Khaki Field Auto 42
- Width: buy 22mm straps. Tapered straps listed as 22/20mm or 22/18mm fit too; only the first number has to match. See strap sizes explained.
- Spring bars: 22mm long, about 2.0mm diameter (spring bar sizes).
- Wrist fit: at 52mm lug-to-lug it should sit within the top of wrists from about 17.3cm up (rule of thumb: lug-to-lug under ~30% of wrist size). That's longer than 95% of the watches in our index. See what size watch suits your wrist.
- Strap thickness: at 11mm thick it's mid-thickness, so most straps suit it; padded leather and NATOs both balance well.
Sources & corrections
Correction, 24 October 2026: This page previously listed 20mm. The 42mm Khaki Field Day Date Auto (H70535) is 22mm.
Lug width checked against: WatchBase: H70535031; WatchBase: H70535061. Last checked 24 October 2026.
Spec wrong for your watch? Send us a correction with your reference number.
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Hamilton Khaki Field Auto 42 — strap questions
What size strap does the Khaki Field Auto 42 take?
The Hamilton Khaki Field Auto 42 has a 22mm lug width, so you need a 22mm watch strap.
Will any 22mm strap fit the Khaki Field Auto 42?
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 22mm end-links made for this model.
What spring bar size does the Khaki Field Auto 42 use?
22mm long and about 2.0mm in diameter (a typical figure; measure the original bar to be sure).
Is the Khaki Field Auto 42 good for strap swapping?
Yes. With standard 22mm spring-bar lugs, NATO, leather, rubber and mesh straps can all be fitted with a spring-bar tool.