What is a surfboard fin key? This small but essential tool is a must-have for surfers. It ensures your fins are securely attached and easily adjustable, allowing you to customize your ride and improve your performance. In this guide, we’ll dive into everything you need to know about the surfboard fin key and its importance in your surfing gear.
What is a Surfboard Fin Key?
A surfboard fin key is a small tool, that’s used to tighten or loosen the screws on removable surfboard fins. These fins attach to the board with small screws, called “grub screws.” The fin key is specially designed to fit into these screws. Without it, you’d have a hard time adjusting or removing your fins!
Why Do You Need a Fin Key?
Having a fin key is helpful for a few reasons unless your fins are permanent:
- Changing Fins: You might want to change your fins based on the waves or your style. A fin key lets you easily swap out fins.
- Traveling with Your Board: When you pack your board for travel, removing the fins can help prevent damage.
- Adjusting Loose Fins: Sometimes, fins can loosen over time. A fin key allows you to tighten them to keep your fins secure.
Shop fin keys at Amazon
FCS Fins vs. Futures Fin Grub Screws
The two most common removable fin systems are FCS Twin Tab (Fin Control System) and Futures. While they both let you change fins, they have slightly different screws.
The differences between FCS and Futures grub screws are how many you need and their thread sizes:
- FCS: The original FCS system uses 2 grub screws, each with a 10-24 thread and a length of 5/16″. FCS II fins can be used without screws.
- Futures: Futures fins use 1 grub screw with a 10-32 thread and a length of 1/2″.
- Both FCS and Futures surfboard fins need a 3/32 stainless Allen key.
Additional differences between FCS and Futures surfboard fins include:
- Tab System: FCS fins feature dual tabs at the base, whereas Futures fins have a single tab.
- Installation: Both systems go into the foam of the surfboard before it gets fiberglass coating. Once the surfboard is “glassed in” the fin boxes for either the FCS or Futures are locked in solid.
- Price: FCS fins are typically more expensive than Futures fins.
While FCS and Futures keys are the same size, the grub screws may look alike, it’s important to use the correct one for each fin system to avoid damaging the fin boxes.
How to Use a Fin Key
Using a fin key is easy:
- Insert the Key: Place the fin key into the grub screw in the fin box.
- Turn the Key: Turn the key left to loosen the screw if you’re removing the fin. Turn it right to tighten it when putting a fin back in.
- Check the Fit: Make sure the fin is secure and doesn’t wiggle.
Be careful not to overtighten the screws, as this can damage the fin box or the grub screw.
Common Issues with Fin Keys and Solutions
- Stripped Grub Screws: If you overtighten or use the wrong key, the grub screw can strip, making it hard to tighten or remove. Replacement screws are available at most surf shops, so you don’t need to worry about replacing the entire fin system.
- Key Gets Stuck in Screw: Sometimes, fin keys can get stuck. Adding a tiny bit of surf wax to the key can help it slide in and out more easily.
- Lost Fin Keys: Fin keys are easy to lose because of their small size. Keeping extras in your surf bag or car is a smart move to avoid getting stuck without one.
Fin Key Alternatives
If you don’t have a fin key on hand, here are a few alternatives that might work in a pinch:
- Hex or Allen Wrench: Many standard hex or Allen wrenches will fit FCS and Futures grub screws. If you have a set of hex keys in your toolbox, try to find the right size. Just be careful not to force it if the fit isn’t exact, as this could strip the screw.
- Multi-Tool: Some multi-tools include small hex or Allen keys that might fit fin screws. However, only use these if they fit snugly. Using the wrong size can damage the screw.
- Borrow from a Fellow Surfer: If you’re at the beach and find yourself without a fin key, asking around can be a great solution. Surfers are usually happy to help, and many carry a fin key with them.
While these alternatives can work in an emergency, it’s best to use an actual fin key whenever possible to avoid damaging the grub screws or fin box.
Shop fin keys at Amazon
Importance of Regular Fin Maintenance
Checking your fins and grub screws regularly is a good habit to develop. If you surf in rough conditions or travel often, it’s especially important. Loose fins can affect your performance, so taking a few minutes to make sure they’re secure will make a big difference.
Tips on Storing Fin Keys and Fins Together
To avoid losing your fin key, it’s helpful to keep it in a specific spot. Consider storing it in a small compartment in your surf bag, your car glove box, or a dedicated fin wallet. Some surfers even attach a small key ring to it to keep it with their car keys or other gear.
Where to Get a Fin Key
Most surf shops sell both FCS and Futures fin keys, and they’re cheap. Many new boards with removable fins come with a fin key included, so check with your board. It’s smart to keep a fin key in your surf bag or car, just in case.
Shop fin keys at Amazon
FAQ: Surfboard Fin Key
Can I use an FCS key for Futures fins or vice versa?
Technically, FCS and Futures keys are both hex keys, and they may look similar. However, they can vary slightly in length and fit, so it’s best to use the correct key for each fin system to avoid damaging the grub screws.
What happens if I lose my fin key?
No worries! You can find replacement fin keys at most surf shops, online stores, or sometimes even hardware stores. They’re inexpensive, so it’s a good idea to have a spare.
Do all surfboards need a fin key?
No, not all surfboards need a fin key. Boards with permanently attached fins don’t require one. Only boards with removable fins, like those with FCS or Futures systems, need a fin key.
How tight should I make the grub screws?
Tighten the grub screws until the fin feels secure, but avoid overtightening. Over-tightening can strip the screw or damage the fin box, which can be costly to fix.
Can I use any Allen key as a fin key?
While some hex keys from tool kits might work, fin keys are usually designed to fit grub screws specifically. Using a standard hex key might not give you the right fit and could damage the screws, so it’s best to stick with an actual fin key.
How do I know if my fin system is FCS or Futures?
FCS fins typically have two small tabs that fit into two slots in the fin box, and they use two screws per fin. Futures fins have a single long base that slides into the fin box and usually has just one screw. You can also check your board or fin brand for specific details.
Can I travel with my fins on, or should I remove them?
It’s generally a good idea to remove fins when traveling to prevent damage. Use your fin key to remove them, then store the fins separately in a fin wallet or other safe container.
Final Thoughts
A surfboard fin key may be small, but it’s an important tool for any surfer with removable fins. Knowing the difference between FCS and Futures keys helps you avoid mistakes and keep your fins in top shape. Just remember to keep track of your fin key—they’re easy to lose!
