Strap for Aquis Date 36.5 Stainless Steel / Black / Bracelet

The lug width (ansa measurement) of the Oris Aquis 01 733 7731 4154-07 8 18 05P is precisely 18mm. This dimension is the internal diameter between the watch lugs and corresponds to the width your replacement strap must have. You can verify this by placing a ruler between the spring bar holes, measuring from inner edge to inner edge.

The choice depends on your use case and aesthetic preference. For formal elegance, we recommend shell cordovan in bourbon or vegetable-tanned calf leather in deep brown, which naturally complements the white dial. For versatility, a NATO in satin cotton in navy blue preserves the technical identity. For wet environments or diving, a black FKM rubber with metal-reinforced keeper is optimal. All straps must have an 18mm lug width.

Position the watch face-down on a soft surface. Locate the spring bars (small metal cylinders) at the lug ends. Using a dedicated spring bar removal tool, gently press underneath the spring bar from one side to release it, then repeat from the other side. The old strap will detach. Align your new strap's holes with the lug ends and carefully reinsert the spring bars, pushing until they snap into the grooves with an audible click.

Any high-quality strap with an 18mm lug width is compatible. Always verify that the spring bars are correctly dimensioned for the case lug (approximately 1.5-2mm diameter). We recommend specialist brands offering standard thicknesses (3-4mm) and satin-finished hardware. Avoid straps with 16mm or 20mm widths, as they would create mechanical play or excessive friction.

A quality leather strap (shell cordovan or vegetable-tanned calf) withstands 2-4 years of daily wear before replacement becomes necessary. Longevity depends on environmental humidity, frequency of wear, and maintenance (clean with dry cloth, allow complete drying after perspiration exposure). Cotton NATO straps last 3-5 years. FKM rubber resists 4-6 years if not exposed to ozone or chemical solvents. Rotating between multiple straps extends each strap's lifespan by allowing rest and natural air drying.