Hamilton
Chrono-Matic H51606640— lug 20mm
Hamilton Chrono-Matic H51606640: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.
Artisanal Note
"This model requires a precise 20mm lug width to preserve the original sartorial balance."
Technical Specifications
Hamilton H51606640The essential strap measurement.
Browse 20mm straps →H51606640
Hamilton caliber H-31 Hours, Minutes, Small Seconds | Date | Chronograph
The Heritage
Compatible Straps
Selected for the 20mm lug width of the Chrono-Matic
FAQ
What is the lug width of the Hamilton Chrono-Matic H51606640?
The lug width of the Hamilton Chrono-Matic H51606640 measures 20mm. This dimension is determined by the proportion between the case diameter (48.50mm) and the visual balance of the watch. To verify exact compatibility, we recommend measuring the internal distance between the lugs with a digital caliper, as manufacturing tolerances of ±0.5mm may affect strap fit.
What is the best strap for the Chrono-Matic H51606640?
The Chrono-Matic H51606640 pairs excellently with aged alligator or calf leather, which develop patina over time in harmony with the steel case. For daily wear and versatility, an FKM rubber or silicone strap offers resistance and functional reliability. Ballistic nylon NATO straps ensure transitions between different contexts without compromising the 20mm lug geometry, provided the total thickness does not exceed 2.5-3mm.
How do you change the strap on a watch with integrated lugs?
Changing the strap on integrated lugs requires specialized tools: a spring bar tool and a stable, well-lit work surface. Position the watch with the lugs facing upward, insert the blade of the spring bar tool into the access hole of the pin, apply even pressure outward until the internal spring disengages, then extract the pin. Repeat on the other end. The new strap must be inserted ensuring the pin clicks into both lug holes. If you are uncertain about the procedure, consult a professional to avoid damage to the case.
Can I use an aftermarket strap on a Hamilton Chrono-Matic H51606640?
Yes, provided it respects the 20mm lug width and is made with quality materials that will not degrade over time. Artisanal aftermarket straps in natural leather, premium rubber, or technical fabric represent a conscious choice, allowing you to personalize the watch while maintaining technical compatibility. Ensure the strap thickness does not exceed the integrated lug dimensions to guarantee proper installation of the spring bars.
How long does a leather strap last on a watch like the Chrono-Matic H51606640?
The lifespan of a natural leather strap varies between 3 and 7 years depending on daily use, moisture exposure, and care applied. Quality calf or alligator leather subjected to periodic conditioning with leather-specific balms maintains elasticity and durability longer. Visible wear (thinning of leather around the closure holes) is natural and part of the watch's patina. Replacing the strap every 4-5 years is recommended practice to ensure structural and aesthetic reliability.