BEST 21MMWATCH STRAPS
Precision aftermarket 21mm replacement straps engineered specifically for odd-lug timepieces with zero pinching, overhang, or spring bar play.
Curated21mm Watch Straps
0 Verified StylesNo matching 21mm straps currently cataloged for this lug size. Check back soon!
Iconic WatchesFeaturing 21mm Lugs
9 Models Cataloged
21mm Lug Width Technical Fitment & FAQ
How is 21mm lug width measured on a watch case?
Lug width (also called horn spacing or strap clearance) is the distance in millimeters between the interior walls of the two watch lugs. To measure, insert the inside jaws of a digital caliper between the lugs parallel to the 12 o'clock or 6 o'clock position. For 21mm timepieces, the interior measurement will read 21.0mm.
Why is 21mm considered an “odd lug width”?
Most watch straps in the mass market are manufactured in even widths (18mm, 20mm, 22mm). Brands like Rolex (Submariner 41, Datejust 41), Grand Seiko (Shunbun SBGA413), and Cartier (Santos Large) deliberately employ 21mm lugs for ideal visual case balance. Using a true 21mm strap eliminates awkward gaps or leather pinching.