I have a progessive sup looks like opening is 10.5 x 1.25 in abs . how is it installed and will it fit?

It installs exactly how a normal single fin would install to any single fin box, and your FCS center fin will go in it as it would into a pair of FCS fin tabs (using fcs hex screws to secure). I will admit, it is a tight fit for FCS Brand fins to get into, I sanded the two tabs a little bit on a cheap FCS Center fin to make it a little easier to get into the adapter. True Ames fins fit in a little easier. However the adapter fits perfectly into any Single fin box (U.S. or Aussie). Worth the purchase price to experiment with

Is this product durable enough to suppot a home made foil mast?

Sorry I am not sure what kind of loads a mast puts on a fin box but if other fin boxes can handle it, so can ours.

can you tell me the width of the opening of the fin box?

The slot that accepts the base of the fin is 1/4 inch wide. The center slot that accepts the metal pin is 9/16 inch. Not sure if that is what you mean by "opening". The fin box is an industry standard for almost all fins designed for a single fin surfboard.

Is it installed similiar to a future center fin box, before laminating or after hot coat?

I installed mine after the hot coat.

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SBS Surfboard Single Fin Box 10.5 Inch

Product ID: 338843836

Details

Brand
Santa Barbara
Colour
black
Item weight
454 g
Material
Plastic
Sport
Surfing

🌊Compatible with Longboards, SUPs & versatile fin setups

📏10.5-inch industry standard length

🛠️Universal fit for all SBS single fins & screws

$U1258

Duties & taxes included

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Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌊 Ride the wave of endless fin possibilities with the SBS 10.5" fin box!

VERSAPLANE READY - Transform your quad fin setup into endless fin arrangement possibilities
DURABLE PLASTIC BUILD - Lightweight yet robust design built to withstand all water conditions
PRECISION 10 5 LENGTH - Fits every single fin imaginable for ultimate customization
UNIVERSAL COMPATIBILITY - Works seamlessly with all SBS fins and no-tool fin screws for effortless upgrades
TRUSTED INDUSTRY STANDARD - Backed by Santa Barbara Surfing with 4.7-star reviews from 150+ riders

The SBS Surfboard Single Fin Box 10.5 Inch is the go-to center fin box for longboards, single fins, eggs, bonzers, and SUPs. Crafted from durable plastic, it fits all SBS single fins and fin screws, enabling versatile fin setups including the innovative Versaplane quad configuration. Lightweight at 454g and highly rated by surfers, it’s the industry standard trusted by pros and enthusiasts alike.

Specifications

ASIN	B071HGNHFC
Age Range Description	All
Brand	Santa Barbara Surfing
Brand Name	Santa Barbara Surfing
Color	Black
Colour	Black
Customer Reviews	4.6 out of 5 stars 156 Reviews
Item Weight	1 Pounds
Item weight	1 Pounds
Manufacturer	Santa Barbara Surfing
Manufacturer Part Number	SBS-125
Material	Plastic Fibreglass
Material Type	Plastic Fibreglass
Model Number	SBS-125
Number of Items	1
Size	10.5"
Skill Level	Intermediate
Sport	Bodyboarding
Sport Type	Bodyboarding
Unit Count	1 Count

Reviews

P**N

good fin box

used in my cedar strip SUP fits a variety if fins

17.07.2021

M**K

Solid box!

Fin box feels solidly made and fit my long board fin. Made the repair of my board quick and easy

3.10.2022

B**L

Great buy!!

Very satisfied. Good quality. Will purchase from this company again

20.08.2025

S**.

Great design = outstanding product

The question "easy to install?" isn't quite fair, as fin box installs are a pain in the neck. But this fin box is a lot easier to install than the originals. Two features make the SBS box a gem, the ribs on the side of the box and the very thin tabs on top. These make the job much easier and quicker with a lot less sanding. The ribs allow you to place the fiberglass cloth inside the rout rather than over the surface of the box. The tabs that suspend the box above the fin rout are about 1/32". With the extra layer of glass and a thick surface tab eliminated, finish sanding becomes a breeze. Great design = outstanding product.

12.09.2023

G**R

Great quality

New and improved box. More surface area for adhesive to bond too.

1.06.2025

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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