Strap for Datejust 31 Stainless Steel Domed Diamond / Oyster / Silver Computer

The Rolex Datejust 31 reference 178344-0031 has a lug width of 16 mm. This measurement corresponds to the internal distance between the two lugs at the strap attachment point. It is essential to verify this with a digital calliper before purchasing an aftermarket strap, as even a 0.5 mm discrepancy can prevent the spring bars from fitting correctly.

For the Datejust 31 in steel and white gold, a vegetable-tanned alligator strap is the most consistent choice with the watch's elegant character: the scaled texture complements the fluted bezel, and the natural patina develops beautifully over time. Shell cordovan offers a smooth, lustrous surface with deep reflective qualities, while high-grade vulcanised rubber suits daily or active wear.

To replace the strap on the Datejust 31, a spring bar tool is required to compress and remove the spring bars securing the strap within the 16 mm lugs. Insert the tool tip into the lateral slot of the lug, compress the spring bar, and slide the strap free. Care must be taken to avoid scratching the steel case or the white gold bezel. If in doubt, entrust the operation to a watchmaker or the Casati Milano atelier.

Yes. The aftermarket offers a range of straps compatible with the 16 mm lug width of the Datejust 31 178344-0031. milanostraps.it stocks a curated selection of handcrafted leather, alligator, cordovan and rubber straps made to 16 mm specifications. It is important to ensure the strap respects the case curvature of the Rolex and is fitted with quality spring bars for a secure attachment.

The lifespan of a leather strap depends on the material, tanning method and frequency of use. A quality vegetable-tanned alligator strap, properly maintained with appropriate leather conditioners and kept away from excessive moisture, can last between three and seven years while retaining its structural and aesthetic integrity. Shell cordovan, owing to its dense fibre structure, tends to offer superior longevity. Casati Milano straps carry an 18-month guarantee against manufacturing defects.