SB1703 & SB1704 Hexad Bracelets — the steel bracelet cut for the Shogurai (SRPL11, SRPL13, SRPL15)

The SB1703 in brushed silver.

Seiko’s redesigned Samurai — the one the community named the “Shogurai” — arrived on a 20mm lug width, down from the 22mm the outgoing Samurai used, and a case profile almost nothing in the aftermarket was cut for. The SB1703 and SB1704 Hexad bracelets are the answer to that: the same bracelet in brushed silver and brushed black, both built to meet this case rather than merely measuring the right width.

If you own the SRPL15, this is a steel bracelet for a watch that didn’t come with one. If you own the SRPL11 or SRPL13, it’s the one that takes over from the factory bracelet.

Does It Fit? The Short Version

Yes, if you own one of these:

• SRPL11 — the burgundy
• SRPL13 — the black dial on steel
• SRPL15 — the black-coated

The Hexad meets all three on a 20mm female end link and tapers to 16mm at the clasp end.

If you’re still working out what your watch takes, or you’re shopping straps rather than steel, the Shogurai strap fitment guide covers the 20mm-versus-22mm story in detail.

Why “20mm” on Its Own Doesn’t Mean It Fits

This is the one that catches people, and it’s worth thirty seconds before you order anything.

A bracelet doesn’t meet your watch across its full width. It meets it through an end link — the piece that closes the gap between the lugs — and on most good bracelets that end link is fitted, shaped to match one particular case profile. The bracelet on an SRPL11 or SRPL13 is the clearest example of it: 20mm, but 20mm cut for this case, with the end link angled to follow these lugs down. Put a 20mm bracelet shaped for a different case on the same watch and the width will be exactly right while the fit is wrong — a gap where the two curves disagree, or a bracelet that rocks instead of sitting still.

The end link is the piece that decides whether a 20mm bracelet actually fits.

There are two ways to be safe about it. A flat or straight end link sidesteps the question entirely — it sits between the lugs and doesn’t care what shape your case is. Or you use an end link cut for the case you actually own, which is what the Hexad’s female end link is.

What You’re Getting

The same bracelet in both finishes.

The hexad link design follows the natural lines of the case instead of fighting them, which is what lets the bracelet read substantial on the wrist without looking bulky or overbuilt. The end link is shaped to sit flush against the case profile, so the bracelet transitions cleanly from lug to link instead of stepping down abruptly where the two meet. The taper from 20mm down to 16mm keeps the proportions balanced rather than top-heavy.

SB1703 or SB1704?

The SB1704 in brushed black.

SB1703, Brushed Silver. The one that leans classic. It keeps a steel SRPL11 or SRPL13 in its original register — a tool diver wearing a different bracelet — and it’s the straightforward choice if you’re upgrading rather than restyling.

SB1704, Brushed Black. Where the silver leans classic, the black shifts the build toward something more purpose-built. It works especially well on dark-dial and black-cased setups where you want everything to disappear into a single monochrome silhouette — which makes it the obvious answer for an SRPL15. The brushed black coating is applied to hold up against the everyday scuffs that come with actually wearing a watch rather than displaying it.

Beyond the finish, they’re the same bracelet: the same 316L construction, the same 20mm female end link, the same taper to 16mm.

The 16mm Clasp End

The bracelet finishes at 16mm, so that’s the clasp size to shop.

The Hexad finishes at 16mm, so that’s the measurement that matters at the clasp end. We list two 16mm clasps as recommended parts for it.

Our pick: B1420 Sub Divers Clasp – Brushed Finish in 16mm — a diver’s clasp in 316L, 40mm long and 8mm thick, with six micro-adjustment holes. Those holes are the part worth caring about: a steel bracelet sized in whole links is either slightly loose or slightly tight, and six positions of fine adjustment let you land in between. It’s a brushed silver clasp, so weigh that against the look you’re building. Alternative:

• B0797 V-Clasp in 16mm — also 316L, also with six micro-adjustment holes, and adding a V-shape safety lock

Fitting and Sizing It

The lugs on these cases are drilled, which makes the bracelet swap a far gentler job than it is on most divers. The spring bars come out through the side of the case with a pin — no forked tool worked blind into a 20mm gap, and no slipped tip dragged across the flank of the case.

The links are held by screws, not friction pins. Sizing is a screwdriver, a steady surface and something to catch anything that rolls — no hammer and no pin pusher. If you’ve only ever sized a pin-and-collar bracelet, this is the forgiving version, and it’s reversible, so getting the length wrong the first time isn’t a trip to a watchmaker.

Which One Are You Buying?

If your Shogurai is the SRPL15, the decision is really just silver or black — it didn’t arrive on a bracelet, so you’re choosing a finish rather than deciding whether to change. If it’s the SRPL11 or SRPL13, you already have a serviceable bracelet, and this is about whether you want the case sitting on something cut for it.

Shop it: SB1703 Hexad Bracelet — Brushed Silver · SB1704 Hexad Bracelet — Brushed Black

FAQ

Which watches does the Hexad bracelet fit?
Seiko SRPL11, SRPL13 and SRPL15.

Will any 20mm bracelet fit my Shogurai?
Not necessarily. A bracelet with a fitted end link is shaped for one specific case, so a 20mm bracelet cut for a different case can be exactly the right width and still sit badly. A flat or straight end link fits any 20mm case, and an end link cut for this case — like the Hexad’s — fits this one.

What’s the difference between the SB1703 and the SB1704?
The finish. SB1703 is brushed silver, SB1704 is brushed black. Both are 316L, both use solid screw links, and both meet the watch on a 20mm female end link tapering to 16mm.

What size is the clasp end?
16mm. The bracelet tapers from 20mm at the lugs down to 16mm at the clasp end.

Can I size it myself?
Yes. It uses screw links, so it’s a screwdriver rather than a pin pusher, and the drilled lugs mean the bracelet comes on and off from outside the case.

Is it solid steel?
Yes — solid links throughout, in 316L stainless steel.