Strap for Datejust 31 Stainless Steel Domed Diamond / Oyster / Bronze - Roman

The lug width of the Rolex Datejust 31 178344-0017 is 16 millimetres. This measurement is specific to 31mm Datejust models and differs from other Datejust references (36mm) which feature 20mm lugs. Measurement is taken using a digital calliper between the spring bar holes on the inside of the Oyster case.

For the 178344-0017 reference in steel and white gold, we recommend straps in alligator leather, vegetable-tanned calf, or shell cordovan. These materials enhance the two-tone case without visual competition. Ideal colours include dark brown, noir, cognac, or bordeaux. Structured rubber straps with integrated deployante clasp offer the most practical choice for daily wear.

Strap replacement requires specialised tools: a spring bar tool and a protected work surface. Position the watch with the lug facing downward, insert the extractor into the small lateral slot of the spring bar, gently push to compress the internal spring, and extract the bar. Reverse the process to install the new strap. If you lack experience, entrust the operation to a qualified watchmaker.

Yes, provided the strap is precisely measured at 16mm between the lugs. Compatibility concerns lug width and overall length (typically 125mm + 75mm for the closure). Before purchasing, verify that the supplier understands this non-standard measurement, as many manufacturers focus their offering on 18, 20, or 22mm widths.

A quality leather strap subjected to daily wear maintains structural integrity for 3–5 years on average. Longevity depends on tanning quality, environmental humidity, frequency of use, and maintenance. Vegetable-tanned leathers age gracefully, developing natural patina. Alligator or cordovan leathers may last 7–10 years. Regular inspection of stitching and buckle is advised to prevent unexpected failure.