Strap for BC4 Flight Timer Stainless Steel / Black

The lug width is 22 mm. This measurement represents the distance between the two lugs (the spring bar attachment points) on the watch case at 12 and 6 o'clock positions. Measure precisely with digital calliper or ruler to verify compatibility with any aftermarket strap.

The optimal choice depends on intended use and personal preference. For aviation and professional operations, a regenerated fibre NATO provides maximum structural support and breathability. For daily sports-elegant wear, vegetable-tanned alligator leather harmonises perfectly with the case's brushed stainless steel finish. For humid or maritime environments, rubber ensures biological resistance and tactile grip.

Use a dedicated spring bar tool. Position the watch securely on a stable surface. Insert the small hook end of the tool into the hole at one spring bar, gently pushing downward until the spring mechanism retracts. The bar then slides out freely. Repeat on the opposite side. Never apply excessive force—smooth, controlled movement is essential.

Yes, all straps with 22 mm lug width are compatible with your BC4. Milano Straps offers a comprehensive selection of 22 mm straps in leather, NATO, and rubber, ready for immediate dispatch. Compatibility is determined solely by lug width measurement, regardless of brand or previous strap origin.

A quality vegetable-tanned leather strap typically lasts 2 to 5 years under intensive use, depending on exposure to moisture, perspiration, and ultraviolet light. Vegetable tanning develops a natural patina that communicates biological longevity. By contrast, a NATO strap has virtually unlimited lifespan. We recommend alternating between two straps to extend overall durability.