FCS II (FCS2) Keyless Surfboard Fin Box System

Product image 1FCS II (FCS2) Keyless Surfboard Fin Box System
Product image 2FCS II (FCS2) Keyless Surfboard Fin Box System
Product image 3FCS II (FCS2) Keyless Surfboard Fin Box System
Product image 4FCS II (FCS2) Keyless Surfboard Fin Box System

Regular price $ 29.89

FCS II (FCS2) Surfboard Fin Boxes 

Side Fins are sold as sets of two (1 left, 1 right)

Available in White or Black  

The FCS II (FCS2) surfboard fin system is the strongest and highest performing fin box on the market to day. Simple pre-glass fin box installation makes a tight foam-to-foam connection for optimal torsion strength that just might be the difference between continuing your session after a collision with something or having to replace your fin box.

When paired with fins from the new FCS II Essential Series Fins, it’s now possible to install and remove your fins in seconds, without the need for any screws or tools. an aerospace grade titanium spring loaded rod locks the fin base into the fin box which improves surfing performance by transferring energy from the surfer's pressure on the board straight to the fin without any delay from a looser fin box to fin connection, like a glass-on fin. 

Requires the FCS II router jig and pattern bit for installation

Available in the following cant degrees:

0 degree (center fin)
3 Degree (typically used as quad rears for more drive)
5 Degree (typically used as quad rears, or create more drive as front fin cant)
9 Degree (typically used as front fins for looser turns and control)


Ask a Question
  • I believe for the tri fin setup I order #2 canted fins and they come automatically 1 left and 1 right and order #1 0 canted fin for the center fin? Correct?

    Yes that is correct. The FCS II fin boxes come in a set of left and right side fins, the center fin box has no cant built in (0 degree cant)

  • Which quantity and degree should I purchase for a standard thruster shortboard

    The degree of cant in the fin box depends on how you want the board to perform.

    Choose 5 degree fin cant for faster, down the line surfing. Choose 9 degree fin cant for more turning ability as the fin pivots quicker at a higher degree.

    You'll need a 0 degree centerfin box too of course for the tri fin set.

    For quad fins choose 9 degree for the front fins and 5 degree or 3 degree for the rear fins depending on your speed vs. turning preference. 

    More info on fin cants, toe in, and positions on a surfboard can be found in our Surfboard Design Guide

  • When do I install these fin boxes? Before of after lamination?

    FCS II Keyless Surfboard Fin Box System is set in pre lamination.

  • Hello, do you ship fcs2 boxes to Brazil? I am interested in 10 sets of three fins (two sides, one center). Thanks

    Greenlight Surf Supply ships worldwide.  There are shipping restrictions for resin and large foam blanks but all other items can be purchased directly through our website Greenlightsurfsupply.com

  • If I am trying to do a 5 fin set up, which fin boxes do I need to buy?

    An FCS II 5 fin setup can be done with a set of 9 degree, 5 degree, and a single 0 degree box as a standard setup.

  • I want to do a 5 fin setup. Either thruster or quad riding mostly on big hollow days. What do you suggest?

    Thruster fin set for head high plus waves, the speed is already there from the wave steepness. 
    Quad fin set for chest high and below for more speed and fun.

  • If I need three fin boxes for a thruster set, what would I put for my quantity?

    For a thruster fin setup you need to order (1) FCS II Center [0 degree] and (1) 5 degree or 9 degree set [sold in pairs of left/right]

    More info on how to choose the right fin cant degrees for your surfboard can be read here: https://greenlightsurfsupply.com/pages/surfboard-fin-design-greenlight-surfboard-design-guide

  • I am working on a wakesurfboard, what fin cant and design do i need?

    It's up to you what fin cant to use on a wakesurf board. In general 5 degree will provide speed to keep in the wake pocket easily. 9 degree cant will be looser and turn faster but a little slower from more drag.

  • Hey, I'm building a 6'2" wooden thruster and I want to use this system. How do I order three though? I'm thinking 9 degrees for the outside two and zero of course for the third. Can I order only three?

    FCSII fin boxes are sold in pairs (one left and one right) for the front fins, the center fin is sold as a single (zero degree)

  • which degree do you think i should get for a retro twin fin

    Use 3 degree cant FCSII fin boxes for a retro keel fins

  • How would FCSII system be installed on a board with a dark pigmented bottom?

    Yes install the FCS II fin boxes after laminainting the board with pigment then laminate a 4 oz fiberglass tail patch with clear resin over them.

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