Strap for Broadway Automatic Chronograph Steel / Grey

The lug width of the Hamilton Broadway H43516731 is 20mm. This measurement is taken between the internal edges of the metal pins (spring bars) that attach the strap. It is a fixed dimension and non-negotiable for ensuring proper strap compatibility.

The ideal strap depends on your intended use and context. Natural alligator with medium grain texture maintains aesthetic continuity with the brushed case finish. Vegetable-tanned calfskin evolves chromatically over time, developing a unique patina. NATO nylon offers practical quick-change capability. FKM rubber is the functional choice for humid or marine environments. All require 20mm width and a stainless steel deployant clasp.

Strap changes require extraction of the metal spring bar pins that secure the lugs. Use a dedicated spring bar tool or a small flathead screwdriver to compress the spring mechanism and extract the pin completely. Insert the new strap by aligning its holes with the lugs and reinsert the pins until you feel them click into place. Apply measured pressure—forcing is unnecessary.

Any strap with a 20mm lug width is geometrically compatible. Verify that the internal hole diameter on both ends of the strap measures at least 20mm wide. Full-grain leather, alligator, natural rubber, and technical fabrics are the primary categories available. Avoid improvisation: source from manufacturers with demonstrated quality credentials.

A premium leather strap (alligator or calfskin) worn daily typically lasts 3–5 years before structural failure at the lugs. Longevity depends on ambient humidity, frequency of use, and maintenance (periodic cleaning, protection from perspiration and direct sunlight). Vegetable tanning ages visibly but retains mechanical integrity longer than chrome tanning. NATO nylon straps have similar lifecycle duration with greater resistance to mechanical wear.