AnchorFlex™ End-Link for Seiko Prospex SPB143 Series - Bathyscaphe Black

AnchorFlex™ End-Link for Seiko Prospex SPB143 Series - Bathyscaphe Black

AnchorFLEX™ End-Link

For Seiko Prospex SPB143 Series

Upgrade your Seiko Prospex SPB143 series dive watch with premium FKM rubber and end-links.

  • End links & spring bars included
  • Integrated curved-end look at the case
  • Fits 5.25″–8″ wrists
  • Soft FKM rubber, comfortable from day one
Precio habitual$109
/
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Material: AnchorFLEX™ FKM rubber

Hardware: 316L Stainless Steel Tang-Buckle

Fitment: Made for Seiko Prospex SPB143 series watches (SPB143, SPB145, SPB147, SPB149, and JDM SBDC101, SBDC103, SBDC105, SBDC107)

A deliberately tight fit. We spec the end thicker than most straps for strength, so seating the spring bars takes more force than you might expect. That's by design. Take your time on the first fitting.

Attachment: End-links & spring bars included. 

Length: 3-piece strap with 2 hole ends (100mm/120mm) and one buckle end (80mm) for maximum flexibility. Comfortably fits wrists from 5..25" to 8"

AnchorFlex™ End-Link

Integrated look. Everyday simplicity.

Fits the Seiko Prospex SPB143 series (SPB143, SPB145, SPB147, SPB149, and JDM SBDC101, SBDC103, SBDC105, SBDC107). Machined 316L end links and spring bars are included.

Made for Seiko's modern 62MAS. Precision-machined end links close the gap to the case for a clean integrated profile, finished with a classic 316L tang buckle.

The same Flagship rubber, shaped for an integrated fit

This is the AnchorFlex Flagship rubber you already know, cut to sit flush against the case. There's no clasp mechanism and no extra hardware. It's just the strap, the end links, and a 316L buckle.

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 SPB143 case, plus spring bars, so it's ready to install straight out of the box.

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
  • Built to complement a tool watch, not overpower it

It's the strap you leave on.

Specifications

Material AnchorFlex FKM rubber
Fits Seiko Prospex SPB143 series: SPB143, SPB145, SPB147, SPB149 / SBDC101, SBDC103, SBDC105, SBDC107 (40.5mm case, 20mm lugs)
End links Machined 316L stainless steel, included
Spring bars Included
Buckle 316L stainless steel
Length 3-piece: two tail ends (100mm / 120mm), 80mm buckle end
Wrist fit 5.25″–8″
Profile Slim and flexible for all-day wear

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.


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