Rolex
Datejust 31 178275f-0004— lug 16mm

The lug width of the Rolex Datejust 31 ref. 178275f-0004 is 16mm. This is an intermediate, non-standard measurement compared to the Datejust 36 (20mm) or the Lady-Datejust 28 (13mm), and requires straps specifically manufactured for this dimension.

For the Everose gold Datejust 31, the most suitable materials are polished alligator leather in bordeaux or cognac — which complements the warm tone of the metal — and shell cordovan for those seeking long-term durability and patina development. The ideal closure is a 14mm rose gold deployant clasp, coordinated to the case, for optimal security and aesthetic consistency.

The strap on the Rolex Datejust 31 is removed using a springbar tool, inserting the flat tip between the lug and the strap to compress the springbars. Care must be taken to avoid scratching the Everose gold case: it is advisable to protect the lugs with masking tape before the operation. Replacement springbars must measure 16mm.

Yes. Milano Straps produces handcrafted aftermarket straps specifically sized for the 16mm lug width of the Datejust 31. Ready-to-ship models are available online with confirmed dimensional compatibility, while the Casati Milano bespoke service allows full customisation of leather, colour, stitching and clasp type, including the option of a rose gold deployant matching the original Rolex hardware.

Longevity depends on the material and frequency of use. A standard calfskin strap typically lasts 12 to 18 months with regular daily wear. Shell cordovan and vegetable-tanned alligator leather can last three to five years or longer, developing a distinctive patina over time. Moisture, perspiration and perfume are the primary causes of degradation: it is advisable to avoid wearing a leather strap in prolonged contact with water.