Rolex
Datejust 31 178384-0012— lug 16mm

The lug width of the Rolex Datejust 31 178384-0012 is 16 millimetres. This dimension is specific to this reference and represents the structural bridge between the 31mm case and ladies' wrists. Any compatible strap must measure exactly 16mm internal width between the lugs.

For the mother-of-pearl dial, we recommend alligator leather with vegetable tanning and hand-stitched finishing: the natural grain texture complements the iridescent reflections of the mother-of-pearl. Alternatively, cognac-coloured shell cordovan develops a golden patina that harmonises perfectly with the 18k white gold of the two-tone case, creating an aesthetic continuity over time.

The strap is changed via spring bars inserted into the lateral holes of the 16mm lugs. Use a dedicated spring bar tool or a rounded blade to press the spring from one side, extract the bar, then insert the new strap. We recommend performing the operation on a soft surface (microfibre cloth) to avoid scratches on the two-tone case.

Yes, provided the aftermarket strap is constructed for 16mm lugs. Milano Straps offers a complete collection of compatible artisanal straps, available online. We advise against DIY adaptations: a strap even 0.5mm wider could cause structural damage to the case.

An alligator or shell cordovan strap with vegetable tanning, worn daily, maintains structural integrity for 3-4 years. The leather will patina naturally, developing an aged surface. Vegetable-tanned calf is more abrasion-resistant (4-5 years), whilst FKM rubber guarantees 5-7 years of intensive wear without aesthetic degradation.