AnchorFlex™ End-Link
Integrated look. Everyday simplicity.
Fits the Seiko 5 Sports Field series with our own machined 316L end links, for a case-hugging profile and the simplicity of a traditional buckle.
Everything you need is in the box — end links and premium 1.8mm spring bars included.
Fits: SRPG27, SRPG29, SRPG31, SRPG33, SRPG35, SRPG37, SRPG39 — Seiko 5 Sports Field, 39.4mm case. Also sold in Japan under SBSA references. Does not fit: SRPJ81 / SRPJ83 / SRPJ85 (36mm, 18mm lugs), or SRPD SKX-style models.
Machined end links, made for this watch
Same geometry as the AnchorFlex Flagship, our original rubber strap — re-engineered for end-link compatibility so it sits flush against the case.
We machine the end links in 316L stainless, shaped to the Field case so the transition from case to strap looks like it came that way from the factory. No extra hardware needed.
Every strap ships with our Premium 1.8mm spring bars, machined to seat cleanly so installation goes smoothly the first time.
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
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
This is a 2-piece strap, sized 80mm and 120mm. It's the strap you leave on.
Specifications
- Material — AnchorFlex™ FKM rubber
- Buckle — 316L stainless steel
- End links — Custom machined 316L, included
- Spring bars — Premium 1.8mm, included
- Fits — Seiko 5 Sports Field series, 20mm lug width
- Length — 2-piece: 80mm and 120mm sides, Fits 6.25-8in wrists.
- 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.
This product has no reviews of its own. The merchant grouped it with related products, so the reviews shown are from across that group.
J
Phenomenal strap. End links are super clean. Love how it looks on my SPB511
R
Perfect strap! High quality fits nicely and feels very premium! Very good customer service!
Can’t wait to get the next one
O
Excellent quality rubber strap! It’s soft, comfortable, and feels great on the wrist all day. I would definitely buy another one.
T
Made my Seiko Hdb008 look like a better watch.
M
Everyday strap now!
D
Awesome strap, comfortable, lines up perfectly to the case, would recommend as a great alternative to the oem seamaster fitted rubber strap
A
Perfect strap. Wonderfully supple and looks OEM.
S
The fitment is great and it gives the timepiece a whole new look. Extremely comfortable.
N
I really like this.. wish this has extra hole for my 6.5 inch wrist fit tightly.. or shorter one choice.
B
Great fit to the original end links and looks incredible! Definitely going to be my summer combination!
K
I was surprised how much I ended up loving this strap. The end links fit perfectly, the texture of the rubber looks great and it’s an extremely comfortable strap. I rarely wear any other strap on my SMP 300 anymore. Another benefit of this strap system is that if you buy Anchor’s oyster bracelet for the 41mm Omega Seamaster, you can use it on the 42mm SMP 300 using the 42mm end links. I find it is also better quality than Forstner’s oyster bracelet.
R
Perfect rubber strap for the Seamaster. End links fit perfectly, rubber strap is soft and super comfortable. Watch wears wonderfully. I really like the design of the buckle. It feel very low profile and smooth to the touch on the wrist. If you’re looking for a rubber strap, this is the one.
A
This is truly a great strap. Fo me this was the strap Tudor should have provided. Quality and comfort it’s on par with other high end straps like Everest. Fit was perfect and works with the factory buckle as well. I would highly recommend recommended this strap to anyone that love the look but was disappointed in the Tudor strap, define upgrade.
A
I bought a strap for my Tudor Pelagos 39, then decided to get the deployment version right after. I ended up keeping both! The quality and style of these is outstanding! I wish you made straps for Rolex!
S
Great Quality and style !!
V
An excellent strap. The endlinks fit perfectly and give it a luxious look to it. The only critique I have is that the second catcher needs a tab so that it doesn't slide off the extra strap length. If you're thinking about it do it!
W
Really looks good on the blue Tudor Black Bay 54. Fits great and looks OEM
R
That is better than on the photo. Perfect match.
Z
Great feeling strap that fits my omega seamaster very well. However, getting the spring bars through the endlink and rubber strap was extremely difficult. I had to use pliers to force the spring bar through the holes scratching the spring bars.
J
Made my watch new again, made me stop looking at other watches. Now that a huge win!
D
Awesome. Simply Awesome Product. As my collection grows I will continue to come back to Anchor Strap. Cheers.
C
The strap feels great!! Good quality materials. The fit into the end link could be better but still very good. Post is slow to Australia.
J
fit great, very comfortable
J
works perfect with OEM end links and looks and feels fantastic
