Watch Lug Width Chart by Brand and Model
The lug width is the millimeter gap between the inside faces of your watch's lugs, and it is the number you buy straps with. This chart lists the confirmed lug width for 23 popular watches across ten brands, every row backed by at least two independent sources (strap makers' fitment pages, spec databases, and official brand pages). It is the band-fit companion to our lug-to-lug explainer, which covers the different question of how long the case is and how it wears on the wrist.
Lug width by brand and model
Where sources disagree on a row, the disagreement is printed rather than averaged. Case sizes are nominal manufacturer figures.
| Watch | Case | Lug width | Notes |
|---|---|---|---|
| Rolex Submariner (124060, 126610, 41mm generation) | 41mm | 21mm | 2020 onward; the odd size surprises Sub owners |
| Rolex Submariner (114060, 116610, 40mm generation) | 40mm | 20mm | Pre-2020 Maxi-case generation |
| Rolex Datejust 36 (126200, 126234 and earlier) | 36mm | 20mm | Consistent across generations |
| Rolex Datejust 41 (126300, 126334) | 41mm | 21mm | Same odd-width trap as the 41mm Submariner |
| Rolex GMT-Master II (steel 40mm refs) | 40mm | 20mm | 116710, 126710 |
| Rolex Cosmograph Daytona | 40mm | 20mm | 116500, 126500 |
| Omega Speedmaster Professional Moonwatch | 42mm | 20mm | One of the friendliest widths to shop for |
| Omega Seamaster Diver 300M (current 210.xx refs) | 42mm | 20mm | Pre-2018 41mm refs also 20mm |
| Tudor Black Bay 58 (79030 and current refs) | 39mm | 20mm | One reference table lists 19mm; two dedicated fitment sources say 20mm |
| Tudor Pelagos 39 (M25407) | 39mm | 21mm | One table lists 20mm; 21mm held by two dedicated sources |
| Tudor Pelagos 42 / Pelagos LHD | 42mm | 22mm | The FXD uses fixed bars; ordinary two-piece straps do not fit it |
| Tudor Black Bay 41 / GMT / Chrono | 41mm | 22mm | Newer METAS-generation refs reportedly 21mm; the standard BB41 is 22mm |
| Seiko 5 SNK807 / SNK805 / SNK809 | 37mm | 18mm | The classic budget strap-swap platform |
| Seiko SKX007 / SKX009 | 42mm | 22mm | Midsize SKX013 is 20mm, not interchangeable |
| Seiko Prospex Turtle SRP777 | 44mm | 22mm | Uses Seiko fat spring bars, 2.5mm; see our spring bar page |
| Seiko Alpinist SPB121 | 39.5mm | 20mm | All current Alpinist references are 20mm |
| Citizen Promaster Diver BN0150 | 42mm | 20mm | Commonly mislisted as 21mm; both fitment sources say 20mm |
| Fossil Grant Chronograph FS4735 | 44mm | 22mm | Fossil's official spec page states strap width 22mm |
| Casio Duro MDV106 | 44mm | 22mm | One strap retailer's page says 18mm, an apparent site error; caliper consensus is 22mm |
| Casio G-Shock GA-2100 (CasiOak) | 45.4mm | 16mm proprietary | Not a standard strap: integrated 16mm connector; adapters enable 22mm straps |
| Tissot PRX 40mm | 40mm | integrated | No strap in the ordinary sense: integrated bracelet with a 12mm lug gap; adapters take 22mm straps |
| Hamilton Khaki Field Mechanical 38 (H694399) | 38mm | 20mm | Official Hamilton spec page states lug width 20mm; the 42mm Khaki Field is 22mm |
| Orient Bambino version 2 (40.5mm) | 40.5mm | 21mm | Another odd-width trap; the 38.4mm Bambino versions are 20mm |
| Orient Kamasu (RA-AA00) | 42mm | 22mm | Confirmed by fitment pages and OEM strap listings |
Three rows deserve their warning repeated. The GA-2100 and the PRX do not play the normal strap game: one has a proprietary connector, the other an integrated bracelet, and both need adapters before any standard strap attaches. And within single model lines, generation beats name: the two Submariner rows are 1mm and one generation apart.
The Rolex section, because it gets its own questions
Rolex lug widths split cleanly by case size and generation. The 40mm sports models (Submariner 40, GMT-Master II 40, Daytona) all take 20mm, and the Datejust 36 does too. The 2020-and-later 41mm cases (Submariner 41, Datejust 41) take 21mm, which is the single most common wrong-size purchase in strap buying: 21mm straps exist but the selection is a fraction of 20mm or 22mm, so buyers guess 20 and return. The Explorer 36 continues at 20mm. If your Rolex is not in the table, the reference number resolves the generation in seconds, and strap retailers' Rolex tables list per-reference widths.
Standard widths and what they mean for shopping
The full ladder of standard widths, with the case sizes each typically appears on and the spring bars they take, is in our band size chart, and the bars themselves are covered in spring bar sizes. The short version for using this table: 18mm and 20mm and 22mm straps are stocked everywhere; 19mm and 21mm are the thin-selection sizes that reward checking stock before you fall in love with a strap; 16mm is mostly women's and small vintage watches plus the G-Shock exception above.
Two related numbers are not lug width, though sellers sometimes blur them. Taper, the width at the buckle end of a strap that narrows (a 22/18 strap), is a style choice on the buckle side. And lug-to-lug distance is a case-length measurement about wrist fit, not band fit; the chart for that lives in our watch database.
How to check your own watch against this chart
- Measure the gap, not the strap. A metric ruler across the inside faces of the lugs, looking straight down. The band size chart has the full method with its traps.
- Round down between sizes. Cases are built on whole millimeters; a 20.4mm reading means 20mm lugs and a worn strap.
- Trust the reference number over the nickname. Every disagreement flag in the table above traces to a generation or size variant, and reference numbers do not have that ambiguity.
Sources
- Rolex widths: the Honcos Straps complete Rolex lug width guide, corroborated per model by the Helvetus Submariner 124060 and Datejust 41 strap guides, the CNS Watch Bands lug width reference, and the Everest Bands Rolex fitment guide.
- Omega Speedmaster and Seamaster 20mm: the WatchGecko Omega straps and sizing FAQ, corroborated by AUG Leather's Omega strap guide and MGB Watches' Omega strap pages.
- Tudor widths (BB58 20mm, Pelagos 39 21mm, Pelagos 42 22mm, BB41 22mm): the MGB Watches Tudor strap compatibility guide and Tudor NATO guide, corroborated by WristBuzz's Tudor dimensions pages; the CNS reference table dissent (19mm BB58, 20mm Pelagos 39) is noted in the table.
- Seiko rows: StrapsCo fitment pages for the SNK807, SKX007, and SRP777, corroborated by Watchband Expert, Delugs, and Worn and Wound reviews; Alpinist SPB121 20mm per the CNS Watch Bands Alpinist guide and TheWatchology review.
- Citizen Promaster BN0150 20mm: the CNS Watch Bands Promaster guide, corroborated by Barton Watch Bands' model-specific BN0150 band listing.
- Fossil Grant FS4735 22mm: Fossil's own product spec page (strap width 22mm), corroborated by Holland Watch Group's strap listing.
- Casio Duro MDV106 22mm: the CNS Watch Bands Duro guide, corroborated by Barton's MDV-106 22mm band listing; the dissenting 18mm retail page treated as a site error. G-Shock GA-2100 16mm proprietary connector: the watchband.direct G-Shock bands guide, corroborated by the Vivir GA-2100 review.
- Tissot PRX integrated bracelet and 12mm lug gap: the WatchCrunch PRX strap adapter hands-on, corroborated by Strapify's PRX 40 strap adapter listing.
- Hamilton Khaki Field Mechanical 38 20mm: Hamilton's official product spec page, corroborated by the CNS Watch Bands Khaki Field guide.
- Orient Bambino 21mm: the Toki Orient Bambino reference guide, corroborated by Basic Bands' Bambino guide. Orient Kamasu 22mm: the CNS Watch Bands Kamasu guide, corroborated by the Watch Researcher hands-on.