Rolex
Datejust 31 178271-0034— lug 16mm

The Rolex Datejust 31 ref. 178271-0034 features a lug width of 16mm. This measurement should be taken internally between the two lug tips using a vernier calliper, and is essential when selecting aftermarket straps to avoid lateral play or stress on the Oystersteel lugs.

For the Datejust 31 in Rolesor Everose, alligator leather straps in bordeaux or cognac tones and vegetable-tanned calfskin represent the most aesthetically and technically coherent choices. Shell cordovan offers a dense surface with natural lustre, ideal for formal settings. The lug width is 16mm, tapering typically to 14mm at the buckle end.

The strap on the Datejust 31 is secured via spring bars fitted into the case lugs. To replace it, use a fine-tipped spring bar tool: compress the spring bar on one side, slide out the strap, and fit the new one with a 16mm spring bar already in place. The operation requires no case opening and does not affect the watch's water resistance.

Yes. Several artisan manufacturers produce aftermarket straps with a 16mm lug width compatible with the Datejust 31. Milano Straps offers a curated selection in alligator, calfskin and cordovan, handcrafted with customisable tapering and available with steel or gold-toned buckles or deployant clasps. Compatibility is guaranteed by the standard 16mm lug width.

The lifespan of a leather strap depends on leather quality, frequency of use, and exposure to perspiration and moisture. A quality vegetable-tanned calfskin strap, worn daily with moderate care, typically lasts 18 to 36 months before showing structural wear. Louisiana alligator and shell cordovan, owing to their denser fibre structure, tend to last approximately 10–15% longer. Regular conditioning with a nourishing cream extends strap life considerably.