Strap for Diving Watch U1 SDR

The lug width of the Sinn 1010.040 is 22mm. This width is characteristic of professional dive watches built with substantial cases and is essential when selecting compatible straps. Before purchasing, verify by measuring between the two lugs on your watch case.

The ideal strap depends on your intended use: for regular diving, choose vulcanised rubber for maximum water resistance; for professional daily wear, a ballistic nylon NATO combines practicality and aesthetics; for timeless elegance, vegetable-tanned leather or shell cordovan offer natural ageing and distinctive patina.

Remove the original strap by withdrawing the spring bars from the lugs, using a dedicated tool or small flat-head screwdriver. Insert the new bars into your aftermarket strap, ensuring the keeper loop is not too tight against the case. Finally, secure the bars to the watch lugs, checking tension is even on both sides.

Yes, provided the lug width is exactly 22mm and the keeper loop diameter accommodates the 1010.040's substantial steel case. Verify too that the strap can support the case weight without bending, particularly if you plan frequent diving use.

A quality leather strap with vegetable tanning and steel hardware typically lasts 3–5 years with daily wear and frequent water contact. Shell cordovan ages more slowly and may last 7–10 years. Regular maintenance—cleaning, drying, and conditioning—significantly extends the strap's lifespan.