Spring Bars (pair)
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Finding the perfect strap or accessory for your watch can greatly enhance comfort and style. Our sizing guides help you measure your watch accurately, ensuring the best fit. Whether you have a traditional watch or an Apple Watch, we provide step-by-step instructions to determine the ideal strap size and watch lug width. With these guides, you can confidently choose the perfect straps and accessories to enhance your watch.
• Traditional Watch Instructions:
1) Open Our Sizing Guide Here. Download Here
2) Print File. In print options dialogue box, uncheck any “shrink oversized pages to fit” or “fit to page” boxes. *IMPORTANT!*
3) After printing, test the accuracy by measuring the “one inch” test strip with a standard ruler.
4) Cut off the inch ruler from the side and wrap around your wrist to determine your wrist size.
5) Hold your watch with the lugs framing the blocks below to determine your lug width. There should be no gap or overlap.
Lug Width Measurement:
To determine your lug width, print the BluShark Watch Sizing Guide in step-1 and place your watch on the measuring blocks located on the bottom of the guide.
• Apple Watch Instructions
1) Open Our Apple Watch Sizing Guide Here. Download Here
2) Print File. In print options dialogue box, uncheck any “shrink oversized pages to fit” or “fit to page” boxes. *IMPORTANT!*

3) Cut out the tool. Position the wider end where you would wear a watch. For a more accurate measurement, you can use a piece of tape to hold the wider end in place.

4) Wrap the tool around your wrist, keeping it in place. Make sure the tool feels snug and doesn’t slide up or down.

5) Note the inch number the arrows point to – that’s your band size.

6) If the arrows land between two measurements, choose the smaller of the two numbers closest to the line.
Adapter Measurement:
To determine which size adapter you need, use the following guide:
If your Apple Watch is 42mm, 44mm, or 45mm, you’ll need an adapter that measures 22mm.
If your Apple Watch is 38mm or 40mm, you’ll need an adapter that measures 20mm.
If you have a 41mm Apple Watch, choose the 20mm adapter.
Unsure of your case size? You can usually find it on the back of your Apple Watch, near the sensor. Or, open the Apple Watch app on your iPhone, go to "My Watch" at the bottom, then tap General > About.
Not sure of your wrist size? Check our wrist size guide!
| Watch Model | Case Size | Order This Strap Size |
|---|---|---|
| Apple Watch (1st Gen) | 38mm | Small Strap |
| Apple Watch (1st Gen) | 42mm | Large Strap |
| Apple Watch Series 1 | 38mm | Small Strap |
| Apple Watch Series 1 | 42mm | Large Strap |
| Apple Watch Series 2 | 38mm | Small Strap |
| Apple Watch Series 2 | 42mm | Large Strap |
| Apple Watch Series 3 | 38mm | Small Strap |
| Apple Watch Series 3 | 42mm | Large Strap |
| Apple Watch Series 4 | 40mm | Small Strap |
| Apple Watch Series 4 | 44mm | Large Strap |
| Apple Watch Series 5 | 40mm | Small Strap |
| Apple Watch Series 5 | 44mm | Large Strap |
| Apple Watch Series 6 | 40mm | Small Strap |
| Apple Watch Series 6 | 44mm | Large Strap |
| Apple Watch SE (1st Gen) | 40mm | Small Strap |
| Apple Watch SE (1st Gen) | 44mm | Large Strap |
| Apple Watch Series 7 | 41mm | Small Strap |
| Apple Watch Series 7 | 45mm | Large Strap |
| Apple Watch Series 8 | 41mm | Small Strap |
| Apple Watch Series 8 | 45mm | Large Strap |
| Apple Watch SE (2nd Gen) | 40mm | Small Strap |
| Apple Watch SE (2nd Gen) | 44mm | Large Strap |
| Apple Watch Series 9 | 41mm | Small Strap |
| Apple Watch Series 9 | 45mm | Large Strap |
| Apple Watch Series 10 | 42mm | Small Strap |
| Apple Watch Series 10 | 46mm | Large Strap |
| Apple Watch Series 11 | 42mm | Small Strap |
| Apple Watch Series 11 | 46mm | Large Strap |
| Apple Watch Series SE 3 | 40mm | Small Strap |
| Apple Watch Series SE 3 | 44mm | Large Strap |
| Apple Watch Ultra | 49mm | Ultra Strap |
| Apple Watch Ultra 2 | 49mm | Ultra Strap |
| Apple Watch Ultra 3 | 49mm | Ultra Strap |
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Standard Double-Flanged Spring Bars
Sometimes you just need the classic, tried-and-true hardware. Our stainless steel standard spring bars provide a secure, traditional mount for your favorite watch straps. Designed with a double flange (the small ridges near the ends), these bars give your spring bar tool a solid grip, making strap changes as smooth and easy as possible.
Sold as a pair, these are the perfect replacements to keep in your watch box for whenever you need a reliable, everyday spring bar.
Specifications
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The Body (1.7mm): A solid middle ground that fits perfectly into the overwhelming majority of watch straps, including traditional two-piece bands and pass-through straps.
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The Tip (0.7mm): The standard pin size, precision-made to seat firmly into the lug holes of almost every standard watch on the market.
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Material: High-quality, durable stainless steel.
Watch Compatibility & Alternatives
These are standard size and will fit the overwhelming majority of watches, from dress pieces and field watches to chronographs and everyday wearers.
Looking for different options?
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Want to go tool-free? If you love the convenience of swapping straps in seconds without reaching for a tool, check out our Standard Quick-Release Spring Bars
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Have a dive watch with larger lugs? If your watch takes a fatter spring bar with oversized lug holes (like many popular Seiko divers), a standard 0.7mm tip will sit loosely and rattle. For those heavier tool watches, you'll want to try our Fat Spring Bars for a rock-solid fit.
Available in 18mm, 19mm, 20mm, 21mm, 22mm, 24mm.