Strap for Fifty Fathoms MIL-SPEC Stainless Steel / Black / Canvas

The lug width of the Blancpain Fifty Fathoms 5008-1130-NABA is 20 mm. This dimension indicates the internal space between the lugs of the case and is the technical specification that determines compatibility with all straps. Always measure from the inner edge to inner edge of the lug to verify accuracy before ordering an aftermarket strap.

The Fifty Fathoms 5008-1130-NABA is compatible with multiple types of 20mm strap. For intensive marine use, we recommend technical rubber in FKM or butadiene, which guarantees rapid drainage and zero maintenance. For luxury aesthetics, equatorial alligator offers fine grain and natural patina development. Italian calf leather with vegetable tanning represents an elegant compromise between durability and controlled ageing. Ballistic nylon NATO straps also emphasise the professional diving vocation of the model.

Strap replacement is performed using a specialised tool (spring bar tool) to gently compress the internal spring of the lug and slide it from the strap keeper on the case. No specialised tools or watchmaker visit is necessary. Position the tool beneath the spring, apply gentle pressure, extract the lug and slide it from the old strap. Insert the new strap by aligning the lug and release. If you prefer to avoid DIY, Casati Milano offers personalised mounting service in the atelier.

Any strap with a 20mm lug width is compatible with the Blancpain Fifty Fathoms 5008-1130-NABA. Compatibility is determined solely by the lug width, not by the watch brand. MilanoStraps offers a dedicated collection of 20mm straps in alligator, calf, rubber, nylon and shell cordovan, all designed and handcrafted to accommodate this standard measurement.

A high-quality leather strap (alligator, calf, shell cordovan) worn on a diving watch like the Fifty Fathoms has an average lifespan of 4-8 years, depending on frequency of use, salt water exposure and maintenance. Seawater accelerates leather ageing and can cause staining and stiffening. To extend life, alternate straps, dry thoroughly after immersion and occasionally apply vegetable protective balms. Casati Milano straps include an 18-month warranty on manufacturing defects.