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: 43948358

Details

Brand
Santa Barbara
Color
black
Item Weight
16 ounces
Material
Polyurethane
Size
10.5"

🌊Versatile for Longboards, SUPs & Bonzer shapes

📏10.5-inch industry standard length

🔧Universal fit for all SBS single fins & screws

$U1282

Duties & taxes included

In stock

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" Single Fin Box!

DURABLE BUILD - Crafted from premium polyurethane, fiberglass, and metal to withstand every wave and wipeout.
UPGRADE YOUR RIDE - Transform quad fin setups into a 'Versaplane' with endless fin arrangement possibilities.
PRECISION 10 5 FIT - The perfect length to accommodate any single fin with ease.
MULTI BOARD VERSATILITY - Ideal for Longboards, Single Fins, Eggs, Bonzers, and Stand Up Paddleboards—one box to rule them all.
UNIVERSAL COMPATIBILITY - Works seamlessly with all SBS single fins and no-tool fin screws for hassle-free setup.

The SBS Surfboard Single Fin Box 10.5 Inch is the industry-standard center fin box designed for ultimate versatility and durability. Compatible with all SBS single fins and no-tool screws, it fits Longboards, Single Fin surfboards, Eggs, Bonzers, and Stand Up Paddleboards. Crafted from robust polyurethane, fiberglass, and metal, it enables surfers to customize fin setups, including converting quads into 'Versaplane' configurations, ensuring you never miss a wave or style upgrade.

Specifications

ASIN	B071HGNHFC
Age Range Description	All
Best Sellers Rank	#158,692 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #93 in Surfing Fins
Brand Name	Santa Barbara Surfing
Color	black
Customer Reviews	4.6 4.6 out of 5 stars (163)
Item Weight	16 ounces
Manufacturer	Santa Barbara Surfing
Manufacturer Part Number	SBS-125
Material Type	Polyurethane, Fiberglass, Metal
Model Number	SBS-125
Size	10.5"
Skill Level	All
Sport Type	Surfing, Standup Paddleboarding
Unit Count	1 Count

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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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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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