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

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NT$1330

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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
Age range (description)	All
Brand	Santa Barbara Surfing
Brand Name	Santa Barbara Surfing
Color	black
Colour	black
Customer Reviews	4.7 out of 5 stars 152 Reviews
Item Weight	454 g
Item weight	454 g
Manufacturer	Santa Barbara Surfing
Manufacturer Part Number	SBS-125
Material	Plastic
Material Type	Plastic
Model Number	SBS-125
Skill Level	All
Sport	Surfing, Standup Paddleboarding
Sport Type	Surfing, Standup Paddleboarding

Reviews

P**N

good fin box

17.07.2021

B**L

Great buy!!

20.08.2025

R**N

Great product

24.08.2021

M**L

Worked perfectly

21.10.2024

G**R

Great quality

1.06.2025

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NT$1330

Duties & taxes included

In stock

Sold byAmazon TaiwanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Taiwan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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5 days ago

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