Strap for Datejust 31 Stainless Steel / Domed - Diamond / Blue - Roman / Jubilee

The lug width of the Rolex Datejust 31 278344RBR-0036 is 16mm. This measurement is taken with a digital calliper by measuring the internal distance between the two lugs directly at the case body. Any strap intended for this reference must have a 16mm attachment width to ensure correct and secure fitment.

For the Datejust 31 278344RBR-0036 in white Rolesor with a diamond-set bezel, the most suitable materials are smooth-belly alligator for formal and elegant occasions, box-calf leather with vegetable tanning for everyday wear that develops a personal patina over time, and shell cordovan for those seeking a rare, compact material. For sport or aquatic contexts, a vulcanised rubber strap in 16mm is the most practical choice.

To replace the strap on the Datejust 31 278344RBR-0036, a proper springbar tool is required to release the spring bars securing the strap to the lugs. Care must be taken to avoid scratching the white gold case: it is advisable to protect the lugs with masking tape before proceeding, or to entrust the operation to a watchmaker or the Casati Milano atelier.

Yes. Aftermarket straps with a 16mm lug width are fully compatible with the Rolex Datejust 31 278344RBR-0036, provided the spring bars have the correct diameter for Rolex lugs. Milano Straps offers a selection of handcrafted 16mm straps, available bespoke or ready to purchase online, compatible with this reference without any modification to the case.

The lifespan of a leather strap depends on the material, tanning method and usage habits. A quality alligator strap with vegetable tanning, worn daily with proper care — avoiding prolonged contact with water and perspiration — will retain its shape and colour for 3 to 5 years. Shell cordovan, due to its dense fibre structure, tends to last even longer. Rotating between several straps and storing them correctly can significantly extend their service life.