Technical Archive

Rolex
Datejust 36 116231-0077— lug 20mm

Rolex Datejust 36 116231-0077: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Datejust 36 Rolesor Everose Fluted / Oyster / Silver Computer

Artisanal Note

"This model requires a precise 20mm lug width to preserve the original sartorial balance."

Technical Specifications

Rolex 116231-0077
Lug Width
20 mm

The essential strap measurement.

Browse 20mm straps →
Reference

116231-0077

Movement

Rolex caliber 3135 Hours, Minutes, Seconds | Chronometer

The Heritage

The Datejust was introduced in 1945 as the first automatic watch with instant date change. It is equipped with the automatic caliber 3135 with official chronometer certification. 36mm case with 20mm lugs, featuring hours, minutes, seconds and date functions.

FAQ

What is the lug width of the Rolex Datejust 36 116231-0077?

The lug width of the Rolex Datejust 36 116231-0077 is 20 millimetres, measured from inner edge to inner edge between the case lugs. This dimension is standard for the Datejust 36 and is compatible with a wide range of high-quality artisanal straps.

What is the best strap for the bicolour Rolex Datejust 36 116231-0077?

For the bicolour Datejust 36 in Everose and stainless steel, we recommend natural alligator in havana or cognac tones to emphasise the warm hue of rose gold, or vegetable-tanned calf leather in bordeaux to articulate chromatic depth. Intense black alligator creates formal drama whilst maintaining aesthetic balance.

How do you correctly change the strap on a Rolex Datejust 36?

Use a dedicated spring bar removal tool. Position the watch on a soft surface, locate the small lateral hole on the lug, insert the tool's tip to compress the spring bar. Once released, the strap detaches easily. Reverse the procedure for the new strap, ensuring the bar clicks into position securely.

Which aftermarket strap is compatible with the Rolex Datejust 36 116231-0077?

Any strap with a 20-millimetre lug width is compatible. We recommend artisanal options in alligator, vegetable-tanned calf, shell cordovan and quality NATO straps. Always verify the manufacturer's specifications. Economical synthetic fabric straps do not do justice to the watch's calibre.

How long does a natural leather strap last on a Datejust 36?

A quality leather strap—alligator, vegetable-tanned calf, shell cordovan—typically lasts 3–5 years with daily wear, depending on exposure to moisture and perspiration. Regular maintenance—cleaning with a soft cloth, occasional application of balm—extends longevity. Casati Milano straps include an 18-month warranty against manufacturing defects and are replaceable at no additional cost.

The next step

The right strap isn’t chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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By appointment only · Milan

The atelier's website: casatimilano.com