AnchorFlex™ End-Link Deployant
Integrated look. Deployant security.
Fits the Seiko 5 Sports Field GMT series (SSK023, SSK025, SSK059, HDB001, HDB002). Machined 316L end links and premium 1.8mm spring bars are included. Not compatible with the non-GMT Seiko 5 Sports Field (SRPG) models. Those use a separate fitment.
Made for Seiko's compact field GMT. Precision-machined end links close the gap to the case for a clean integrated profile, and the 18mm Precision Deployant Clasp makes it secure and effortless to put on and take off.
Everything you need, in the box
No need to hunt down your original bracelet parts. Each strap comes with machined 316L end links cut for the Field GMT case and premium 1.8mm spring bars, so it's ready to install straight out of the box.
The right fit out of the box
Every deployant version ships as a 3-piece set: two clasp ends and one hole end. That means no guessing a size at checkout. Pick the combination that fits your wrist, and you're done.
Precision Deployant Clasp
- 18mm, machined from 316L stainless steel
- Brushed and polished finishing
- Available as an add-on on this page
Why FKM
FKM fluoroelastomer is what we build every AnchorFlex strap from, and it's why they last:
- Holds up to UV, heat, and chemicals
- Won't crack, fade, or go brittle with age
- Soft and pliable against the wrist, but structured enough to keep its shape
- No sagging or collapse the way cheap rubber does
Built on the Flagship profile
- Clean modern lines with a subtle taper
- Substantial enough for daily wear, refined enough to dress up
- Sized to suit a 39mm field watch without overpowering it
It's the strap you leave on.
Specifications
| Material | AnchorFlex FKM rubber |
| Fits | Seiko 5 Sports Field GMT: SSK023, SSK025 (39.4mm case, 20mm lugs) |
| End links | Machined 316L stainless steel, included |
| Spring bars | Premium 1.8mm, included |
| Clasp | 18mm Precision Deployant, 316L stainless steel (brushed/polished), available as an add-on |
| Length | 3-piece: two clasp ends (75mm / 100mm), 105mm hole end |
| Wrist fit | 5.25″–8″ |
FAQs
Some end-link installs can feel tight at first because the thickness rubber strap at the end-link is maximized to ensure durability. There are a few ways to get it installed:
First, try gently wiggling and pushing the spring bar through until the spring bar pops into the opposite side of the end link. This can require some effort.
You can also squeeze the rubber portion of the strap into the end link between your thumb and index finger while pushing the spring bar into place. This helps compress the rubber slightly and gives the spring bar more room to seat properly.
If those techniques do not work, our premium 1.7mm spring bars can be used as an alternative. There is no downside to using them, but we recommend trying the first two installation methods first since the standard spring bars usually work once everything is seated correctly.
If you still have trouble, contact us and we can help troubleshoot the install.
AnchorFLEX™ straps are made from premium FKM rubber and have been third-party tested to be free of harmful fluorinated “forever chemicals” within the scope of the testing performed. We do not intentionally add PFAS-based coatings, surface treatments, or chemical finishes to our straps. Because FKM is a fluorinated rubber, we avoid vague blanket claims and clearly disclose the material. Customers who prefer to avoid fluorinated rubber entirely may prefer our nylon, sailcloth, leather, or other non-FKM strap options.
