2026-06-08
Watch Straps — A Beginner's Guide
Watch Straps — A Beginner's Guide
If you have just bought your first watch, inherited one, or simply want to change how a watch looks and wears — this guide covers everything you need to know. Watch straps are simpler than they appear and changing them yourself takes under two minutes once you know how. This guide starts from the beginning.
What Is a Watch Strap?
A watch strap — also called a watch band — is the piece of material that wraps around your wrist and holds the watch in place. It attaches to the watch case via two small cylindrical pins called spring bars, one on each side of the case. The strap closes around your wrist with a buckle or clasp.
Most watches come with a strap or bracelet already fitted. Changing it is one of the simplest and most effective ways to change how the watch looks, feels, and suits different occasions — without buying a new watch.
The Parts of a Watch Strap
Understanding the parts makes sizing and fitting much easier:
The long piece — the longer half of the strap that contains the buckle holes. Goes over the top of the wrist.
The short piece — the shorter half that the buckle attaches to. Goes under the wrist toward the inside.
The buckle — the metal closure that secures the strap. Standard buckles use a pin through a hole. Deployant clasps fold over and click shut without a pin.
The keeper — the small loop that holds the tail of the strap flat after buckling. Some straps have two keepers; some have one fixed and one floating.
Spring bars — the small cylindrical pins that hold each piece of the strap to the watch case lugs. You usually cannot see them when the strap is fitted. They sit inside the gap between the lug and the strap end.
The lugs — the protrusions on the watch case where the strap attaches. The gap between the lugs is called the lug width, measured in millimetres.
What Is Lug Width — and Why It Matters
Lug width is the single most important measurement for buying a watch strap. It is the gap in millimetres between the two lugs on your watch case. A strap must match this measurement exactly — a 20mm strap will not fit a watch with 18mm lugs, and vice versa.
How to find your lug width:
Option 1 — Check the specifications. Most watch manufacturers list lug width in the watch specifications. Search your watch model online and look for "lug width" or "strap width" in millimetres.
Option 2 — Measure it. Use a ruler or digital calipers to measure the gap between the inner edges of the two lugs. Measure in millimetres.
Option 3 — Check the existing strap. Many straps have the width printed or stamped on the inside of the strap near the buckle end.
The most common lug widths:
| Lug Width | Common Examples |
|---|---|
| 18mm | Slim dress watches, Nomos, Junghans, ladies' watches |
| 20mm | Omega Seamaster, Seiko SKX, Tudor Black Bay — the most common size |
| 22mm | Tudor Pelagos, IWC Pilot's Watch, larger sport watches |
| 19mm | Vintage Rolex references |
| 21mm | Rolex Oyster Perpetual 36mm |
For a complete list of lug widths by watch model see the lug width reference guide.
Do I Need a Short Strap?
Watch straps come in two lengths — standard and short. Standard straps are sized for a wrist circumference of approximately 165–185mm (6.5–7.3 inches). If your wrist is smaller than this, a standard strap will leave an excess tail hanging beyond the buckle that looks wrong and feels untidy.
How to check: After buckling your current strap, look at how much material extends beyond the buckle. If it passes through both keepers and still has 20mm or more of excess — or if you have to fold it back on itself — you need a short strap.
How to measure: Wrap a flexible tape measure around your wrist just above the wrist bone. If the circumference is under 165mm (6.5 inches), order a short strap.
CNS stocks short watch straps in leather and suede across all lug widths. For infinite adjustment without needing a short strap, see perlon watch straps — these buckle through the weave at any position.
What Materials Are Watch Straps Made From?
The material determines how the strap feels, how it handles your lifestyle, and what occasions it suits. The main options:
Leather — the classic choice. Warm against the skin, develops character with wear, suits dress and smart-casual occasions. Full-grain calfskin is the premium grade — the only leather that develops a genuine patina over time. Avoid water and sustained sweat exposure.
Rubber — the most practical for active use. Fully waterproof, requires no maintenance, rinse and wear. FKM rubber is the professional grade used by Omega, Tudor, and Rolex. Silicone is softer and lighter — better for gym and everyday active wear.
Nylon — the most versatile. Light, water-resistant, available in hundreds of colours and patterns. The single-pass construction provides spring bar security backup. The most practical everyday option for casual and active use.
Canvas — woven fabric with a heritage, earthy character. Suits field and military watches. More textured and more characterful than flat nylon.
Perlon — a ladder-weave nylon that buckles through the weave itself for infinite micro-adjustment. No fixed hole positions — the fit is exact to the millimetre. Surprisingly refined — the only fabric strap that suits dress watches naturally.
Sailcloth — a technical woven fabric for dive and nautical watches. More refined than canvas, more textured than nylon.
For a detailed comparison of every material see the watch strap materials guide.
Which Strap Should I Start With?
For most first-time strap buyers, start with one of these three:
Black leather — if you want the most formal and most versatile option. Suits every occasion from smart-casual upward. See black leather watch bands.
Warm brown leather — if you want the most characterful everyday option. Suits casual and smart-casual wear, develops a beautiful patina with use. See brown leather watch bands.
Black or navy nylon — if you want the most practical option. Water-resistant, light, works with everything, very low cost. See nylon watch bands.
If you are unsure, black smooth calfskin in your correct lug width is the most universally correct starting point — appropriate for every occasion and every watch.
What Is a Spring Bar?
A spring bar is the small cylindrical pin that holds the strap to the watch. Each strap uses two — one on each side. Inside the pin is a compressed spring that pushes outward, locking the bar into holes in the watch lugs.
Standard spring bars require a small tool called a spring bar tool to compress and release. The tool's forked tip compresses the end of the bar, releasing it from the lug hole.
Quick-release spring bars have a small lever on the side. Press the lever with your fingernail and the bar releases instantly — no tool required. All CNS straps ship with spring bars included, and most include quick-release bars.
For full instructions see how to change a watch strap.
How to Change a Watch Strap — The Short Version
- Place the watch face-down on a soft surface
- Insert the spring bar tool tip into the groove at the end of the spring bar
- Push inward to compress the bar and release it from the lug hole
- Repeat on the other side and remove the old strap
- Fit the new strap by compressing the new spring bars into position between the lugs
With quick-release spring bars, press the lever with your fingernail — no tool needed. The full step-by-step guide with troubleshooting is at how to change a watch strap.
What Tools Do I Need?
Spring bar tool — required for standard spring bars. A small forked instrument that compresses the spring bar end. Available from CNS at spring bar tools.
Nothing — if your strap uses quick-release spring bars. Your fingernail is sufficient.
Soft surface — a folded cloth or microfibre to rest the watch on while working. Prevents scratching the caseback.
The Most Common Beginner Mistakes
Ordering the wrong lug width — measure twice before ordering. A 20mm strap will not fit a 22mm watch. See the lug width guide.
Ordering a standard length for a small wrist — if your wrist is under 165mm, order a short strap.
Wearing a leather strap in water — leather absorbs water and deteriorates with repeated wetting. Switch to nylon or rubber for active and water use.
Not conditioning leather — full-grain calfskin needs conditioning every two to three months to stay supple and avoid cracking at the buckle holes. See how to care for a leather watch strap.
Forcing a spring bar — spring bars require patience, not force. If the bar won't compress, reposition the tool tip in the groove. Forcing can scratch the case or send the bar flying.
Frequently Asked Questions
What watch strap do I need? You need two measurements: lug width (the gap between your watch lugs in millimetres — determines which strap fits the watch) and wrist circumference (determines whether you need standard or short length). Once you have both, choose your material based on how and where you wear the watch. See how to choose a watch strap.
Can I change my watch strap myself? Yes — virtually any watch with standard spring bar lugs can have its strap changed at home. With quick-release spring bars it takes under 30 seconds. With standard spring bars and a tool it takes two to five minutes on the first attempt. See how to change a watch strap.
How much does a watch strap cost? Quality watch straps range from around $9 for nylon to $25-40 for full-grain leather. A quality leather strap that lasts two to four years costs less per day than almost any other clothing or accessory purchase.
What is the difference between a watch strap and a watch band? Nothing — the terms are used interchangeably. "Watch strap" is more common in British English; "watch band" is more common in American English. Both refer to the same product.
Will any strap fit my watch? Any strap in the correct lug width fits any watch with standard spring bar lugs. The lug width must match exactly — a 20mm strap fits a 20mm lug gap, not an 18mm or 22mm. Watches with proprietary connectors (such as Apple Watch) require brand-specific bands and are not compatible with standard spring bar straps.
Start shopping: Leather watch straps | Nylon watch bands | Rubber watch bands
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