Straps & sizing · updated November 2026

Grand Seiko lug width chart

Lug widths for every Grand Seiko reference in our database, with case size and lug-to-lug so you can buy the right strap.

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The short answer

Grand Seiko lug widths range from 13 to 23 mm across the 137 references we track. Width follows case size and collection, so look up your exact reference rather than assuming.

By collection

Family	Lug width	Refs	Examples
Heritage	13 mm / 14 mm / 15 mm / 18 mm / 19 mm / 20 mm / 21 mm	65	STGF387 · STGF389 · STGK007 · STGK009 · STGK019 · STGK021…
Evolution 9	20 mm / 21 mm / 22 mm / 23 mm	26	SLGB003 · SLGB006 · SLGB015 · SLGW003 · SLGW007 · SLGB023…
Elegance	19 mm	23	SBGW281 · SBGW283 · SBGW285 · SBGW287 · SBGW301 · SBGW305…
Sport	19 mm / 20 mm / 21 mm / 23 mm	18	SBGN027 · SBGN029 · SBGP015 · SBGV245 · SBGE253 · SBGE255…
Masterpiece	19 mm / 22 mm / 23 mm	5	SBGZ003 · SBGZ011 · SBGD201 · SBGD202 · SBGD228


STGF387	Heritage · 62GS 26mm	13 mm	26 mm	32.9 mm	8.1 mm	Bracelet	–
STGF389	Heritage · 62GS 26mm	13 mm	26 mm	32.9 mm	8.1 mm	Bracelet	–
STGK007	Heritage	13 mm	27.8 mm	33.5 mm	11.2 mm	Bracelet	–
STGK009	Heritage	13 mm	27.8 mm	33.5 mm	11.2 mm	Bracelet	–
STGK019	Heritage	13 mm	27.8 mm	33.5 mm	11.2 mm	Bracelet	–
STGK021	Heritage	13 mm	27.8 mm	33.5 mm	11.2 mm	Bracelet	–
STGK023	Heritage	13 mm	27.8 mm	33.5 mm	11.2 mm	Bracelet	–
STGK003	Heritage	14 mm	28.7 mm	35.1 mm	10.9 mm	Strap	–
STGK004	Heritage	14 mm	28.7 mm	35.1 mm	10.9 mm	Strap	–
STGK006	Heritage	14 mm	28.7 mm	35.1 mm	10.9 mm	Strap	–
STGF359	Heritage · Annual Accuracy Quartz	14 mm	28.9 mm	35.4 mm	8.7 mm	Bracelet	–
STGF385	Heritage	14 mm	28.9 mm	35.4 mm	8.8 mm	Bracelet	–
STGK031	Heritage · 62GS Mechanical 30mm	15 mm	30 mm	36.2 mm	10.5 mm	Bracelet	–
STGK033	Heritage · 62GS Mechanical 30mm	15 mm	30 mm	36.2 mm	10.5 mm	Bracelet	–
SBGX363	Heritage · Annual Accuracy Quartz	15 mm	32.3 mm	39 mm	9 mm	Bracelet	–
SBGX365	Heritage · Annual Accuracy Quartz	15 mm	32.3 mm	39 mm	9 mm	Bracelet	–
SBGX359	Heritage · Annual Accuracy Quartz	15 mm	33 mm	39.7 mm	9.1 mm	Bracelet	–
SBGX361	Heritage · Annual Accuracy Quartz	15 mm	33 mm	39.7 mm	9.1 mm	Bracelet	–
SBGW291	Heritage	18 mm	36.5 mm	42.7 mm	11.6 mm	Bracelet	–
SBGW297	Heritage · 44GS Manual-winding	18 mm	36.5 mm	42.7 mm	11.6 mm	Bracelet	–
SBGW299	Heritage · 44GS Manual-winding	18 mm	36.5 mm	42.7 mm	11.6 mm	Bracelet	–
SBGW306	Heritage	18 mm	36.5 mm	42.7 mm	11.7 mm	–	–
SBGW323	Heritage · Manual-winding mechanical	18 mm	36.5 mm	42.7 mm	11.6 mm	Bracelet	–
SBGH347	Heritage · Mechanical Hi-Beat 36000	19 mm	37 mm	44.6 mm	13.3 mm	Bracelet	–
SBGX261	Heritage	19 mm	37 mm	44.6 mm	10 mm	Bracelet	–
SBGX263	Heritage	19 mm	37 mm	44.6 mm	10 mm	Bracelet	–
SBGX265	Heritage	19 mm	37 mm	44.6 mm	10 mm	Bracelet	–
SBGX355	Heritage · Annual Accuracy Quartz	19 mm	37 mm	44.6 mm	10.6 mm	Bracelet	–
SBGX357	Heritage	19 mm	37 mm	44.6 mm	10.6 mm	Bracelet	–
SBGW281	Elegance	19 mm	37.3 mm	44.3 mm	11.7 mm	–	–
SBGW283	Elegance · The beauty of simplicity	19 mm	37.3 mm	44.3 mm	11.7 mm	–	–
SBGW285	Elegance · The beauty of simplicity	19 mm	37.3 mm	44.3 mm	11.7 mm	–	–
SBGW287	Elegance	19 mm	37.3 mm	44.3 mm	11.7 mm	–	–
SBGW301	Elegance · Hand-winding Mechanical	19 mm	37.3 mm	44.3 mm	11.7 mm	–	–
SBGW305	Elegance · Manual-winding	19 mm	37.3 mm	44.3 mm	11.7 mm	Bracelet	–
SBGW325	Elegance · Manual-winding mechanical	19 mm	37.3 mm	44.3 mm	11.7 mm	–	–
SBGY002	Elegance	19 mm	38.5 mm	43.7 mm	10.2 mm	Bracelet	–
SBGY007	Elegance · Hand-winding Spring Drive	19 mm	38.5 mm	43.7 mm	10.2 mm	Bracelet	–
SBGY013	Elegance · Manual-winding Spring Drive	19 mm	38.5 mm	43.7 mm	10.2 mm	Bracelet	–
SBGY023	Elegance	19 mm	38.5 mm	43.7 mm	10.2 mm	Bracelet	–
SBGY043	Elegance · Hand-winding Spring Drive	19 mm	38.5 mm	43.7 mm	10.2 mm	Bracelet	–
SBGZ003	Masterpiece	19 mm	38.5 mm	43.7 mm	9.8 mm	Bracelet	–
SBGA427	Heritage	19 mm	39 mm	46.8 mm	12.3 mm	Bracelet	–
SBGA429	Heritage	19 mm	39 mm	46.8 mm	12.3 mm	Bracelet	–
SBGN027	Sport	19 mm	39 mm	45.9 mm	12.3 mm	Bracelet	–
SBGN029	Sport	19 mm	39 mm	45.9 mm	12.3 mm	Bracelet	–
SBGH263	Elegance	19 mm	39.5 mm	n/p	13.1 mm	–	–
SBGJ249	Elegance	19 mm	39.5 mm	46.9 mm	14.1 mm	Bracelet	–
SBGJ251	Elegance	19 mm	39.5 mm	46.9 mm	14.1 mm	Bracelet	–
SBGJ271	Elegance	19 mm	39.5 mm	46.9 mm	14.1 mm	Bracelet	–
SBGJ273	Elegance · Mechanical Hi-Beat 36000 GMT	19 mm	39.5 mm	46.9 mm	14.1 mm	Bracelet	–
SBGM221	Elegance · Automatic 3-Day Power Reserve GMT	19 mm	39.5 mm	46.9 mm	13.7 mm	Bracelet	–
SBGM255	Elegance · Automatic Mechanical GMT	19 mm	39.5 mm	46.9 mm	14.1 mm	Bracelet	–
SBGM257	Elegance · Automatic Mechanical GMT	19 mm	39.5 mm	46.9 mm	14.1 mm	Bracelet	–
SBGR261	Elegance	19 mm	39.5 mm	46.9 mm	13.1 mm	Bracelet	–
SBGA375	Heritage · Automatic Spring Drive 3-Day	19 mm	40 mm	46.2 mm	12.5 mm	Bracelet	–
SBGA384	Heritage	19 mm	40 mm	46.2 mm	12.5 mm	Strap	–
SBGA385	Heritage	19 mm	40 mm	46.2 mm	12.5 mm	Strap	–
SBGA493	Heritage	19 mm	40 mm	46.2 mm	12.5 mm	Bracelet	–
SBGA507	Heritage	19 mm	40 mm	46.2 mm	12.5 mm	Bracelet	–
SBGA509	Heritage	19 mm	40 mm	46.2 mm	12.5 mm	Bracelet	–
SBGH281	Heritage	19 mm	40 mm	46.2 mm	13.3 mm	Bracelet	–
SBGH299	Heritage	19 mm	40 mm	46.2 mm	13.3 mm	Bracelet	–
SBGH301	Heritage	19 mm	40 mm	46.2 mm	13.3 mm	Bracelet	–
SBGH345	Heritage · Mechanical Hi-Beat 36000	19 mm	40 mm	46.2 mm	13.3 mm	Bracelet	–
SBGJ263	Heritage	19 mm	40 mm	46.2 mm	14 mm	Bracelet	–
SBGJ265	Heritage	19 mm	40 mm	46.2 mm	14 mm	Bracelet	–
SBGJ267	Heritage	19 mm	40 mm	46.2 mm	14 mm	Bracelet	–
SBGV239	Heritage	19 mm	40 mm	46.2 mm	10.4 mm	Bracelet	–
SBGZ011	Masterpiece · Manual-winding Spring Drive	19 mm	40 mm	45.2 mm	9.6 mm	Bracelet	–
SLGH013	Heritage	19 mm	40 mm	47.2 mm	11.7 mm	Bracelet	–
SBGA293	Elegance	19 mm	40.2 mm	48.5 mm	12.8 mm	Bracelet	–
SBGA407	Elegance · Automatic Spring Drive 3-Day	19 mm	40.2 mm	48.5 mm	12.8 mm	Bracelet	–
SLGB003	Evolution 9 · Spring Drive U.F.A.	20 mm	37 mm	44.3 mm	11.4 mm	Bracelet	–
SLGB006	Evolution 9	20 mm	37 mm	44.3 mm	11.4 mm	Bracelet	–
SLGB015	Evolution 9	20 mm	37 mm	44.3 mm	11.4 mm	Bracelet	–
SBGH343	Heritage · 62GS Mechanical Hi-Beat 36000	20 mm	38 mm	44.7 mm	12.9 mm	Bracelet	–
SBGH368	Heritage · Mechanical Hi-Beat 36000	20 mm	38 mm	44.7 mm	12.9 mm	–	–
SBGH376	Heritage · Mechanical Hi-Beat 36000	20 mm	38 mm	44.7 mm	12.9 mm	–	–
SBGW289	Heritage	20 mm	38 mm	44.7 mm	12.9 mm	Bracelet	–
SLGW003	Evolution 9	20 mm	38.6 mm	45 mm	9.95 mm	Bracelet	–
SLGW007	Evolution 9 · Manual-winding Mechanical Hi-Beat 36000 80 Hours	20 mm	38.6 mm	45 mm	9.95 mm	Bracelet	–
SBGA437	Heritage	20 mm	40 mm	46.6 mm	12.3 mm	Bracelet	–
SBGA439	Heritage	20 mm	40 mm	46.6 mm	12.3 mm	Bracelet	–
SBGA465	Heritage	20 mm	40 mm	46.6 mm	12.3 mm	Bracelet	–
SBGH349	Heritage · Mechanical Hi-Beat 36000	20 mm	40 mm	46.6 mm	13 mm	Bracelet	–
SBGP007	Heritage	20 mm	40 mm	47 mm	10.8 mm	Bracelet	–
SBGP009	Heritage	20 mm	40 mm	47 mm	10.6 mm	Bracelet	–
SBGP013	Heritage	20 mm	40 mm	47 mm	10.6 mm	Bracelet	–
SBGP015	Sport	20 mm	40 mm	47.1 mm	12.4 mm	Bracelet	–
SBGR321	Heritage	20 mm	40 mm	46.6 mm	13 mm	Bracelet	–
SBGV245	Sport	20 mm	40 mm	47.1 mm	11.8 mm	Bracelet	–
SBGE253	Sport	20 mm	40.5 mm	48.7 mm	14.7 mm	Bracelet	–
SBGE255	Sport	20 mm	40.5 mm	48.7 mm	14.7 mm	Bracelet	–
SBGE257	Sport	20 mm	40.5 mm	48.7 mm	14.7 mm	Bracelet	–
SBGM245	Sport	20 mm	40.5 mm	48.6 mm	14.4 mm	Bracelet	–
SBGM247	Sport	20 mm	40.5 mm	48.6 mm	14.4 mm	Bracelet	–
SBGA211	Heritage	20 mm	41 mm	49 mm	12.5 mm	Bracelet	–
SBGA469	Heritage	20 mm	41 mm	49 mm	12.5 mm	Bracelet	–
SBGA413	Heritage	21 mm	40 mm	47 mm	12.8 mm	Bracelet	–
SBGA415	Heritage · Automatic Spring Drive 3-Day	21 mm	40 mm	47 mm	12.8 mm	Bracelet	–
SBGH351	Heritage	21 mm	40 mm	47 mm	12.9 mm	Bracelet	–
SBGH353	Heritage	21 mm	40 mm	47 mm	12.9 mm	Bracelet	–
SLGB023	Evolution 9	21 mm	40.8 mm	48.5 mm	12.9 mm	Bracelet	–
SLGB025	Evolution 9	21 mm	40.8 mm	48.5 mm	12.9 mm	Bracelet	–
SBGR299	Heritage	21 mm	42 mm	47.9 mm	13.1 mm	Bracelet	–
SBGE277	Sport · Automatic Spring Drive 3-Day GMT	21 mm	44 mm	50.8 mm	14.7 mm	Bracelet	–
SBGE295	Sport · Automatic Spring Drive 3-Day GMT	21 mm	44 mm	50.8 mm	14.7 mm	Bracelet	–
SBGJ237	Sport	21 mm	44.2 mm	50.6 mm	14.4 mm	Bracelet	–
SBGJ277	Sport · Mechanical Hi-Beat 36000 GMT	21 mm	44.2 mm	50.6 mm	14.4 mm	Bracelet	–
SLGA009	Evolution 9 · Spring Drive 5 Days	22 mm	40 mm	47.9 mm	11.8 mm	Bracelet	–
SLGA019	Evolution 9	22 mm	40 mm	47.9 mm	11.8 mm	Bracelet	–
SLGA021	Evolution 9 · Spring Drive 5 Days	22 mm	40 mm	47.9 mm	11.8 mm	Bracelet	–
SLGA025	Evolution 9 · Spring Drive 5Days	22 mm	40 mm	47.9 mm	11.8 mm	Bracelet	–
SLGB007	Evolution 9	22 mm	40 mm	47.2 mm	11.7 mm	Bracelet	–
SLGB009	Evolution 9	22 mm	40 mm	47.2 mm	11.7 mm	Bracelet	–
SLGB011	Evolution 9	22 mm	40 mm	47.2 mm	11.7 mm	Bracelet	–
SLGB013	Evolution 9	22 mm	40 mm	47.2 mm	11.7 mm	Bracelet	–
SLGH005	Evolution 9 · Hi-Beat 36000 80 Hours	22 mm	40 mm	47 mm	11.7 mm	Bracelet	–
SLGH011	Evolution 9	22 mm	40 mm	47 mm	11.7 mm	Bracelet	–
SLGH017	Evolution 9	22 mm	40 mm	47 mm	11.7 mm	Bracelet	–
SLGH019	Evolution 9	22 mm	40 mm	47 mm	11.7 mm	Bracelet	–
SLGH029	Evolution 9	22 mm	40 mm	47 mm	11.7 mm	Bracelet	–
SLGH031	Evolution 9	22 mm	40 mm	47 mm	11.7 mm	Bracelet	–
SLGH033	Evolution 9	22 mm	40 mm	47 mm	11.7 mm	Bracelet	–
SLGH035	Evolution 9	22 mm	40 mm	47 mm	11.7 mm	Bracelet	–
SBGE285	Evolution 9	22 mm	41 mm	48.3 mm	13.9 mm	Bracelet	–
SBGD201	Masterpiece	22 mm	43 mm	51.8 mm	13.2 mm	Bracelet	–
SBGD202	Masterpiece	22 mm	43 mm	51.8 mm	13.2 mm	Bracelet	–
SLGC009	Sport · The Tentagraph	23 mm	43 mm	50 mm	15.6 mm	Bracelet	–
SLGC001	Evolution 9 · The Tentagraph	23 mm	43.2 mm	51.5 mm	15.3 mm	Bracelet	–
SLGC007	Evolution 9 · The Tentagraph	23 mm	43.2 mm	51.5 mm	15.3 mm	Bracelet	–
SBGA481	Sport	23 mm	44.5 mm	50 mm	14.3 mm	Strap	–
SBGC253	Sport	23 mm	44.5 mm	50 mm	16.8 mm	Strap	–
SBGD228	Masterpiece · Spring Drive 8-Day Jewelry Watch	23 mm	44.5 mm	52 mm	14.4 mm	Bracelet	–
SBGE307	Sport · Automatic Spring Drive 3-Day GMT	23 mm	44.5 mm	50 mm	14.9 mm	Strap	–
SLGA001	Sport	23 mm	46.9 mm	50.8 mm	16 mm	Strap	–

Click a column heading to sort. n/p = not published by the brand. Quick-release "Yes" only where the brand page says so; "–" means not stated, not "no".

Which strap type?

Rubber or silicone: the practical choice for swimming and hot weather. It doesn't absorb water and rinses clean.
Fabric single-pass or two-piece nylon: light and cheap. A single-pass strap runs under the case, which adds a little height on the wrist.
Leather: dressier, but water and sweat shorten its life. Keep it off dive watches you actually swim with.
Steel bracelet: the most durable, but aftermarket bracelets need end links shaped for the specific case, which brands rarely publish. Buy one listed for your exact reference.

Spring bars: what Seiko doesn't publish

Seiko lists lug width, but not spring-bar diameter or a strap code. Aftermarket straps vary in how large their spring-bar holes are, so before you buy, check the strap's stated hole size against the bars you'll use, or reuse the original bars if they fit. See our spring bars and tools guide.

Questions

What lug width are Grand Seiko watches?

It varies by reference. Use the table: sort by lug width or search your reference.

Does Grand Seiko publish spring-bar sizes?

Not on the product pages we checked.

Can I fit a third-party strap to a Grand Seiko?

If the width matches, yes. Bracelet models use fitted end links, so a strap may leave a gap at the case; that is normal.

Not sure? Try Watch Finder →

Watch.co is independent and not affiliated with any brand. We haven't handled these watches for this page: everything here comes from brand-published specs and our own analysis. Brand names are used only to identify products.