A NATO watch strap is a one-piece nylon strap that loops under the watch case and through the spring bars for added security.
For the full breakdown, see our best 22mm NATO Watch Strap guide.
The design that defines a NATO watch strap traces straight back to a British Ministry of Defence requirement from 1973. Originally called the G10, this one-piece nylon webbing strap threads under the watch case rather than attaching to fixed lugs like a standard two-piece strap. That single design choice is the whole point: if one spring bar fails, the strap still holds the watch to your wrist.
The Real Story Behind the NATO Name
Despite the name, NATO itself says the strap is not actually a NATO-branded item. NATO’s history page states the strap was created by the British Ministry of Defence in 1973 and used by forces of a NATO member country — Britain. The “NATO” label stuck through common use and the military requisition system rather than any official alliance branding.
The G10 designation comes from the military paperwork. One source ties the name to the requisition form G-1098 and NATO stock numbers 6645-99-124-2986 and 6645-99-527-7059.
The original spec called for a 20 mm wide strap in Admiralty grey, made from straight cross-weave nylon ribbon. Today you’ll find NATO straps in every color and width imaginable, but the classic grey 20 mm version remains the one that started it all.
How a NATO Strap Fits Your Watch
NATO straps work with any watch that has spring bars. The one-piece design passes through the top spring bar, under the watch case, and through the bottom spring bar — so the strap relies on having intact spring-bar hardware on both sides. When both bars are fully seated, the watch rides securely inside the strap’s webbing.
Getting the fit right starts with measuring your watch’s lug width. 22mm NATO watch straps are the most common size for modern sports watches, but 18 mm, 20 mm, and 24 mm versions are all readily available. If you are ready to buy, our tested roundup of the best 22mm NATO watch strap options covers the top picks that hold up over daily wear.
Two Ways to Thread It
Most wearers use the classic method: thread the long end through the top spring bar, then down through the bottom spring bar, through the keeper and buckle, and tuck the excess tail through the keepers. A reverse method threads from the opposite direction — the result works the same, but the excess tail sits differently.
If you find the double layer under the case too bulky under a shirt cuff, a single-loop configuration reduces the thickness. The trade-off is slightly less security, since you lose the redundant layer that gives the NATO its safety advantage.
What Most People Get Wrong
- The wrong lug width. The strap must match your watch exactly. An 18 mm strap on a 20 mm watch leaves gaps and weakens the whole setup. Measure before you order.
- Twisted webbing. Keep the strap flat while threading so it does not bind or sit unevenly on your wrist.
- Loose spring bars. Fully seated, secure spring bars are critical. A misaligned or compressed bar increases the risk of failure — the exact thing the strap is meant to protect against.
- Overtightening. Wear it snug but not tight enough to restrict circulation. A good comparison is a seatbelt: firm and secure, but comfortable for all-day wear.
- Messy tail handling. You can tuck the excess tail inward or outward. Inward is the cleaner look for most wrists, though very small wrists may not have enough room for inward tucking.
Care and the Safety Payoff
Nylon NATO straps clean up easily with soap and water. Skip harsh chemicals — they weaken the fibers and fade the color over time.
The real value of a NATO strap shows up when something goes wrong. On a standard two-piece strap, a single broken spring bar sends the watch falling. On a NATO strap, the one-piece design keeps the watch attached to your wrist even if one spring bar fails. That peace of mind is why the design has outlived its military origins and become a favorite for divers, hikers, and anyone who doesn’t want to lose a good watch to a hardware failure.