Lum-Tec band size chart: 20 printed lug widths, 20 to 24mm, curved-lug story included

Lum-Tec is the Ohio assembler whose product copy answers the strap question itself: 20 of the 24 watch SKUs in the lum-tec.com feed print a lug width inside their spec paragraphs, every one quoted verbatim below from a fresh pull at build [1]. The other four are the Eclipse integrated-bracelet watches, which print a 26 to 18mm taper instead of a lug width and are marked as such, never guessed. The reason this chart needed building is the curve: the Combat spec paragraph prints 43mm case width, forged 316L Surgical grade Stainless Steel 13.6mm case thickness including domed sapphire 51.5mm lug-to-lug 22mm lug width [3], and the same page insists the watch is wearing more like a 46-47mm lug length effectively. A raw lug-to-lug table without that sentence overstates every Combat B on the wrist.

Quick answer: 22mm is the mainstream, 11 of the 20 width-bearing references (the 43mm Combat B class B67 to B73, the B60, the B64, the Combat Field X4 and X6). 20mm covers 6 references (39mm B74 GMT, Solar Marine 5 to 8, RPM 3). 24mm covers 3 (Super Combat B5, both M94 Bronze). The 4 Eclipse references print no lug width at all and are listed as such.

The printed rails: 9 families, 20 watches

FamilyLug widthCaseLug to lugWears likeRail exactly as printed
Combat B 43mm class, B67 to B73 (7 refs) [3]22 mm43mm51.5mm46-47mm51.5mm lug-to-lug 22mm lug width
Combat B60 24HR Automatic (1 refs) [4]22 mm43mm51.5mm46 to 47mm22mm lug width
B64 Chronograph (1 refs) [5]22 mm43mm51.5mm46-47mm51.5mm lug to lug length with curved lug profile
Combat Field X4 Titanium (and X6 GMT) (2 refs) [6][7]22 mm44mm50mmnot printed44mm case width excluding crown - 22mm welded wire lugs with spring bars
39mm Combat B74 GMT (1 refs) [8]20 mm39mm46mm41-42mm46mm lug-to-lug 20mm lug width
Solar Marine 5, 6, 7 and 8 (4 refs) [9]20 mm39mm43.5mmnot printed43.5mm lug-to-lug 20mm lug width
RPM 3 (1 refs) [11]20 mm43mm41mmnot printed43mm case width 20mm lug width 41mm lug to lug length
Super Combat B5 (pre-order) (1 refs) [12]24 mm45mm53mmnot printed53mm lug-to-lug 24mm lug width
M94 Bronze Date and No date (2 refs) [13]24 mm44mm51mmnot printed51mm lug-to-lug 24mm lug width

Every rail above is a contiguous quote from the body copy of a product page in the fresh feed pull, read straight off the store's own product JSON [1]. Two rows deserve a flag. The Combat Field width comes from the welded wire lugs line, 44mm case width excluding crown - 22mm welded wire lugs with spring bars, a title-class width rather than a literal lug width label [6]. The RPM 3 run, 43mm case width 20mm lug width 41mm lug to lug length, packs three numbers in sequence; the order is case, width, lug-to-lug, adjudicated here at build against the full sentence rather than a nearest-number guess [11]. Nothing else on this page is parsed: where a value appears, the printed rail it came from sits next to it.

The curved-lug story: 51.5mm that wears like 46-47mm

Nine of the twenty width-bearing references print a 51.5mm lug-to-lug on a 43mm case, which reads enormous on paper and is not on the wrist. Lum-Tec's own copy is unusually direct about it: The 51.5mm lug-to-lug length may sound long, but much of that length comes from the steep downward curve the steep downward curve [4], with the watch wearing more like a watch with an effective lug-to-lug length of 46 to 47mm. The B73 and B64 pages close the same loop, wearing more like a 46-47mm lug length effectively [3][5]. The 39mm B74 GMT argues the same point from below: the case 316L stainless steel case measures just 46mm lug-to-lug, but The effective wrist span is closer to that of a 41-42mm lug-to-lug case. [8]. No strap guide anywhere carries these sentences; they are the difference between buying a 22mm strap for a watch you expect to be huge and buying it for the 46-47mm watch you actually get.

The 24mm trio and the 20mm six

Three references take 24mm, and they are the heavy ones: the Super Combat B5 pre-order prints 45mm case width 13.9mm case thickness 53mm lug-to-lug 24mm lug width on a forged titanium 45mm case [12], though its own copy notes The 53mm lug-to-lug length is substantially reduced by the curve, and both M94 Bronze references print 44mm case width, solid CuSn8 bronze case and crown 13.8mm case thickness including domed sapphire 51mm lug-to-lug 24mm lug width [13][14]. The 20mm side is the compact end: the whole Solar Marine 5 to 8 family prints 39mm case width 10.7mm case thickness including sapphire 43.5mm lug-to-lug 20mm lug width [9][10], the 39mm B74 GMT pairs 20mm with its short 46mm span, and the RPM 3 is the odd one, a 43mm case on a 41mm lug-to-lug, the shortest print in the catalog [11].

The four that print no lug width: the Eclipse integrated bracelet

The Eclipse E1, E3, E5 and E6 cannot take a standard strap at all, and the copy says why: 42mm case width excluding crown - Integrated 26 to 18mm tapered bracelet, 3mm thick and Lug to lug length 47mm [15][16]. The bracelet is fixed at the case, tapers from 26mm quickly down to 18mm for supreme comfort [15]. There is no 22mm or 24mm answer to give, so this chart gives none; anyone sizing an Eclipse needs the bracelet, not a strap.

What the brand's own strap shop says

The feed's 30 strap, buckle and accessory SKUs cross-check the watch side. The 2025 Combat strap is a custom-fit curved upgrade FKM rubber strap in black, 22mm width, and its exclusions are printed too: Will not fit original B1, B2, or Super Combat models. [17]. A 24mm FKM variant exists for the heavier models [18], and the original OEM rubber strap lists its taper options as 26/22mm, 24/22mm or 22/22mm. [19]. The Combat B steel bracelet is a 316L Stainless Steel 22/22 bracelet with printed exclusions, These DO NOT fit B20-B28 models These DO NOT fit B48 or B50 models [20]. One boundary case is flagged rather than tabled: the Brown Leather Military strap pair print the words lug width in a phrase, Designed to fit any watch with same lug width., followed by Width: 22mm or 24mm Length: 280mm/11inch; that is a fit instruction, not a watch spec, so it counts as strap-side surface only [21]. Counting those two phrase-bearing strap SKUs, 22 of the feed's 60 products touch the words lug width; the chart tables only the 20 watch rows.

How this catalog was counted

The basis is a single fresh en-US pull of the lum-tec.com product feed at build time, products.json with a 250-product window, returning exactly 60 products, identical product for product to the pass-X research pull [1]. The default feed page serves 30; the window is the quoted basis. By the store's own product_type field: 24 Watches, 30 Straps, 4 Buckles and 2 Extras. All 24 watches are enumerated above, 20 width-bearing and 4 Eclipse integrated-bracelet. No legacy or sold-out M-series SKUs appear in this window; older references not in the feed are deliberately absent rather than backfilled. watchbands.ai, the largest strap-size database, listed 193 brands at build time with no lum-tec entry in slug or text, controls firing [2], and search results return only the store's own pages, dealer listings and per-model reviews, nothing consolidated. Prices are deliberately absent: the feed serves bare numbers with no currency, and the rendered product page served euros to the build client, so no price is printed here without a verified currency.

Sources

  1. lum-tec.com product feed, fresh en-US pull at build 2026-09-30 (products.json?limit=250; the feed serves 30 products on its default page and 60 through the 250-window, all 60 enumerated on this page): lum-tec.com
  2. watchbands.ai brand index, fresh pull at build: 193 unique brand slugs, all single-segment root-relative hrefs, zero legacy /brands/ hrefs; no lum-tec match in slug or page text; controls seiko, citizen and rolex all present: watchbands.ai
  3. lum-tec.com PDP, Combat B73, the Combat B 43mm class representative: lum-tec.com
  4. lum-tec.com PDP, Combat B60 24HR Automatic: lum-tec.com
  5. lum-tec.com PDP, B64 Chronograph: lum-tec.com
  6. lum-tec.com PDP, Combat Field X4 Titanium (X6 GMT prints the identical rail): lum-tec.com
  7. lum-tec.com PDP, Combat Field X6 Titanium GMT: lum-tec.com
  8. lum-tec.com PDP, 39mm Combat B74 GMT: lum-tec.com
  9. lum-tec.com PDP, Solar Marine 5 (Solar Marine 6, 7 and 8 print the identical rail): lum-tec.com
  10. lum-tec.com PDP, Solar Marine 8: lum-tec.com
  11. lum-tec.com PDP, RPM 3: lum-tec.com
  12. lum-tec.com PDP, Super Combat B5 Pre-Order: lum-tec.com
  13. lum-tec.com PDP, M94 Bronze Date (M94 Bronze No date prints the identical rail): lum-tec.com
  14. lum-tec.com PDP, M94 Bronze No date: lum-tec.com
  15. lum-tec.com PDP, Eclipse E1 (E3, E5 and E6 print the identical rail): lum-tec.com
  16. lum-tec.com PDP, Eclipse E6: lum-tec.com
  17. lum-tec.com PDP, New Upgrade Combat B FKM Rubber Strap 22mm: lum-tec.com
  18. lum-tec.com PDP, NEW Upgrade FKM Rubber Strap 24mm: lum-tec.com
  19. lum-tec.com PDP, The Original Lum-Tec OEM Rubber Strap 22mm, 24mm and 26mm: lum-tec.com
  20. lum-tec.com PDP, Combat B Stainless Steel Bracelet: lum-tec.com
  21. lum-tec.com PDP, Brown Leather Military SS Strap 22mm and 24mm: lum-tec.com