Strap for Datejust 31 Stainless Steel Diamond / Oyster / White - Roman

The lug width of the Rolex Datejust 31 178384-0020 is precisely 16 millimetres. This measurement is specific to Datejust 31 models and is essential for aftermarket strap compatibility. To measure your lug width, place a calibrated ruler on the inner surface of the strap between the two spring bar holes.

For the Datejust 31 178384-0020, alligator leather with vegetable tanning is the most elegant and durable choice. If you prefer a more robust material for daily wear, fine-grained calf or shell cordovan offer excellent craftsmanship and develop natural patina over time. For sports-oriented use, a vulcanised rubber strap with stainless steel deployant provides practicality without aesthetic compromise.

Strap replacement requires a specialist tool to remove and reinsert the spring bars. Secure the watch in a padded vice with PTFE-lined jaws, locate the lateral pins on the lugs, gently press downward to release the internal hook and extract the pin. Align your new strap with the lug holes, reinsert the spring bars until you hear the click of secure seating. If you lack experience, contact an authorised service centre.

Yes, provided the lug width is exactly 16 millimetres. Straps with 18mm or 14mm lugs are incompatible and will create unwanted play. Rolex does not manufacture official aftermarket straps, so certified artisan strap makers represent the only option for those seeking carefully selected materials and bespoke craftsmanship.

Lifespan depends on material and usage patterns. Vegetable-tanned alligator lasts 8–12 years with routine maintenance. Shell cordovan is considerably more durable, often exceeding 15 years. Fine-grained calf requires more attention to atmospheric exposure but endures 6–10 years. Regular maintenance—gentle cleaning, thorough drying, storage away from intense sunlight—significantly extends service life.