NATO Strap
A NATO strap is a one-piece woven nylon watch strap that threads under the case. It has a military origin, is very secure, and is washable. Even if one spring bar fails, the watch stays on your wrist. You size it by the case lug width.
At a glance
- Material
- Woven nylon, one-piece
- Origin
- British military G10 strap
- Sizing
- Lug width, usually 18-22 mm
The one-piece construction is what defines a NATO strap. A single band of nylon runs under the case, between both spring bars, and seats the watch flat on top. The design traces back to the G10 strap issued by the British military in 1973 under Defence Standard 66-15, and the NATO name is a common nickname taken from its stock number.
Why it is secure and practical
Because it passes under both spring bars, the watch stays threaded on the band even if one bar fails, rather than dropping. That is what keeps it dependable in the field.
- One-piece security: the watch holds even if a spring bar gives way
- Washable nylon: it shrugs off sweat and salt water, and you can rinse it
- Fast changes: swap colors in minutes with no tools
Sizing and use
With a NATO, the figure that matters is the gap between the case lugs, not the length. This measurement is the lug width, usually 18, 20, or 22 mm. A NATO looks less formal than a metal bracelet, but it pairs naturally with a field watch. See other options in straps and bracelets, or read our guide to the best Japanese watches.
Examples
A versatile Seiko 5 like the Seiko SNK355K takes an 18 mm NATO in minutes for a more casual, more secure everyday look.
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Comparison
A one-piece NATO is not the same as a two-piece nylon strap.
| Option A | Option B | Notes |
|---|---|---|
| NATO strap (one-piece) | Two-piece nylon strap | A NATO runs under both spring bars, so the watch holds if one fails; a two-piece strap fixes to each bar separately, so a broken bar can drop the watch. |
Related terms
Watches that show this
Frequently asked questions
Why is a NATO strap considered so secure?
Because it is one piece, the strap runs under both spring bars. Even if one bar breaks, the watch is still threaded on the band and does not drop to the ground. That redundancy is the main reason the military favored it.
What size NATO strap should I choose?
You choose by the gap between the case lugs, known as the lug width. On most watches this is 18, 20, or 22 mm. If you do not know your watch, measure the space between the lugs with a ruler.
Can a NATO strap be washed?
Yes, the nylon weave handles sweat and salt water well. You can remove the strap from the watch, rinse it in warm water with a little mild soap, and let it air dry. This makes it far lower maintenance than leather.