✦ HOROLOGICAL TECHNICAL REFERENCE · 35 TIMEPIECES INDEXED
WATCH LUG WIDTH& FITMENT GUIDE
The definitive horological database covering reference numbers, generation notes, and canonical millimeter spacing across Rolex, Omega, Tudor, Grand Seiko, Hamilton, and more.
Lug Width:
Showing 35 timepieces
Fitment: Modern 1861 & 3861 Moonwatches use 20mm; vintage FOIS & CK2998 use 19mm.
Fitment: Modern 42mm ceramic dial models take 20mm straps with straight or fitted curved ends.
Fitment: 41mm models feature 20mm lugs (earlier 41.5mm had 20mm); 38mm variant has 19mm lugs.
Fitment: Modern 41mm references (124060 / 126610) use 21mm lugs; older 40mm models (16610 / 116610) use 20mm.
Fitment: All modern GMT-Master II references (16710, 116710, 126710) feature standard 20mm lugs.
Fitment: Standard 20mm lug spacing on both 116500LN and updated 126500LN references.
Fitment: Classic 20mm lug width across all 36mm Datejust references.
Fitment: Modern 1263xx generation features 21mm lugs (Datejust II 1163xx had 21mm as well).
Fitment: Modern 36mm (124270) has 19mm lugs. The 39mm (214270) has 20mm lugs; 40mm (224270) has 21mm lugs.
Fitment: Modern 42mm (226570 / 216570) uses 21mm lugs. Vintage 40mm references (16570 / 16550 / 1655) feature 20mm lugs.
Fitment: Modern 42mm (226570 / 216570) uses 21mm lugs. Vintage 40mm references (16570 / 16550) feature 20mm lugs.
Fitment: The 39mm Black Bay 58 has a canonical 20mm lug width with drilled lug holes.
Fitment: Grade 2 titanium case with 21mm lug width. Uses 21mm rubber or single-pass nylon.
Fitment: 41mm Black Bay Heritage models use 22mm lugs (new 2024 Master Chronometer models use 21mm).
Fitment: Classic ISO-certified 200m diver with 22mm drilled lugs and fat 2.5mm spring bars.
Fitment: Both historic SARB017 and modern Prospex SPB121 feature standard 20mm lugs.
Fitment: Takes 20mm dress straps; tapered 20/16 or 20/18 profiles emphasize the sunburst dial.
Fitment: Modern SRPG series uses 20mm; vintage SNK809 series uses 18mm.
Fitment: Features 21mm odd-lug spacing on the Zaratsu-polished titanium 62GS case.
Fitment: High-intensity titanium case with 20mm lug width.
Fitment: 38mm Mechanical has 20mm drilled lugs. The Khaki Field Auto 42mm uses 22mm lugs.
Fitment: The popular 38mm Murph uses 20mm lugs; the original 42mm movie edition uses 22mm.
Fitment: Large model uses 21mm strap spacing; Medium uses 18.5mm QuickSwitch adapters.
Fitment: Tank Must Large has 19mm lug width. Tank Must Small has 16mm or 17mm.
Fitment: Features EasX-CHANGE system but accepts any standard 20mm spring bars and aftermarket straps.
Fitment: Canonical 20mm lug width across both modern 3716 and previous 3714 generations.
Fitment: 43mm model takes 22mm straps; the 41mm takes 20mm; the 46mm takes 24mm.
Fitment: Standard 44mm Luminor case features 24mm lugs with screw-in bar or quick release pins.
Fitment: Square 39mm case uses 22mm straps with heavy taper to deployment buckle.
Integrated BraceletBlue DialSteel40mm CaseIntegrated LugsRef. T137.407.11.041.00 / T137.407.11.051.00
Fitment: Features 12mm central notch with 26mm shoulder flare. Requires integrated PRX-specific straps.
Fitment: Features 21mm odd-lug spacing. Pairs with 21mm leather and supple suede.
Fitment: Classic 20mm lug width with drilled lug holes for quick strap changes.
Fitment: Tangente 38 has 19mm lug width with long angular lugs; Tangente 35 has 18mm lugs.
Fitment: Classic Bambino 40.5mm uses 21mm lugs. Bambino 38mm uses standard 20mm lugs.
Fitment: 18mm inner lug width; standard 18mm single-pass NATO slips easily beneath the pins.
1. Measure the Inside Gap
Always measure the interior clearance between the two case lugs where the spring bar rests. Never measure the outside width of the case horns or the buckle end of an existing strap.
2. Mind the Odd-Lug Spacing
Timepieces with 19mm or 21mm lugs (e.g. Rolex Submariner 41, Grand Seiko Shunbun, Cartier Santos Large) require exact odd-sized straps. Squeezing a 20mm or 22mm strap risks damaging the leather and jamming spring bars.
3. Check Spring Bar Diameter
Standard dress timepieces use 1.5mm–1.8mm spring bars. Heavy-duty dive watches like the Seiko SKX and Turtle use “fat” 2.5mm spring bars that require enlarged strap tunnels.