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FCS Longboard Fin Box Adapter
FCS Longboard Fin Box Adapter
FCS Longboard Fin Box Adapter
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The longboard fin box adapter by FCS converts a single SUP center fin box to fit an FCS fin.
Our Price: $18.00

Availability: Usually Ships in 1 to 2 Business Days
Product Code: FN-FCS-BX-ADAPT


The longboard fin box adapter by FCS allows you to change from a traditional longboard center fin to an FCS thruster set up in seconds. The reason you need an adapter is that the center fin box on stand up paddle boards is a different type of box than the side FCS compatible fin boxes. An SUP thruster fin set-up doesnt use a traditional longboard fin in the center box, but rather three similar size FCS compatible fins in a three fin configuration. The thruster set-up is preferred by many of the top surfing pros. Its a great fin set-up for loosening up your high-performance stand up paddle surfing board. The adapter is adjustable for deeper longboard center fin boxes.

Included in the Adapter Package:

  • One box adaptor insert
  • One stainless steel plate
  • One short screw

About FCS

FCS, which is an acronym for Fin Control System, is the pioneering company in removable fin systems. Before the 1990s, most surfboard fins were an inseparable component of a surfboard. The fins were glassed right to the board. There were removable fins as far back as the 1960s, but it wasnt that common and there was no standardization so things werent really interchangeable. So to a larger degree, whoever was manufacturing the board was also making the decision about fin configuration and fin selection. FCS came along in the early 1990s and separated these three pieces by creating and popularizing a standardized FCS fin box. Suddenly board manufacturing and fin choice and fin configuration selection were largely separated.

FCSs standardization of fin boxes made removable fins commonplace. This changed a number of things. First off, it allowed for massive advances in fin design and performance as companies were tinkering with new materials and various designs. Secondly, it allowed surfers to use one surfboard (the control factor in this experimentation) and change their fin configuration to find out what they liked best. They could even use different configurations for different conditions. Lastly, it made surfboards far easier to transport with the fins removed, which was no trivial event. Manufacturers and retailers were able to store and transport boards much easier, and with much less risk of breakage.

In large part due to FCS, the variety of fins available is almost overwhelming and surfing performance has made great strides. The market for SUP fins is really just in its infancy (as R&D production cycles can be years in the fin industry), but be sure that FCS fins will be at or near the forefront of what is to come in the advance of SUP fin design.

Average Customer Review: 5 of 5 Total Reviews: 1 Add your review

  0 of 0 people found the following review helpful:
FCS LOngboard Fin Box Adapter March 18, 2017
Review by: Batron Black from San Pedro, CA United States  
Great product, very versatile.

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