A paddle board center fin is held in place by a single small screw and washer that seat into a slot in the fin box, and the right fix for a lost one is a replacement set matched to your fin, not a random screw from the garage.
That little screw does a big job. It keeps the fin from sliding out of its box while you paddle, and a fin that works loose in open water can drop to the bottom of the lake without you noticing until you are already fighting to track straight. So the size matters more than it looks.
Here is the part that trips people up. The screw is not a standard hardware-store bolt you can eyeball by length. It pairs with a matching washer (or a plate inside the box) that spreads the load so the head does not pull through or crack the fin box. Grab a screw that is too long, too short, or the wrong thread and you either strip the box, fail to lock the fin, or leave a sharp end poking out. None of those are worth saving a few minutes.
NIXY fins are tool-less, which means the screw hand-tightens: no coin, no screwdriver, just snug it down until the fin sits firm. Depending on your board and fin, the screw seats toward the nose or toward the tail of the box, so note which way yours faced before you pulled the old fin. Snug is the goal, not cranked. Overtightening a plastic fin box is its own way to crack it.
If you have lost the screw, skip the guesswork. NIXY sells a matched replacement set made for its fins, so you get the correct screw and washer as a pair instead of hunting through a drawer.
The NIXY Fin Screw - Set of Two includes two screws and two washers sized for NIXY fins, so a lost screw or a spare in the dry bag costs a few dollars and keeps you on the water.
Frequently asked questions
Can I use any screw from the hardware store?
You can try, but it is a gamble. The screw has to match the thread and length that the fin box expects and pair with a washer that spreads the load. The wrong one strips the box, refuses to lock the fin, or leaves an edge exposed. A matched replacement set removes the guesswork and protects the box.
Do NIXY G5 fins need a screw, or are they tool-less?
Both are true. NIXY center fins are tool-less, meaning you hand-tighten them with no tools, but the fin is still secured by a screw and washer that seat into the box. Tool-less refers to how you tighten it, not to the fin skipping hardware.
What if the fin itself is cracked, not just the screw?
Then a new screw will not save it. A fin with a cracked base or a chipped tab can slip or fail even when snug. See how to replace a paddle board fin, and browse the full NIXY fins collection to match a center fin to your board and water.
Keep a spare screw with your repair kit. It weighs nothing, and it is the difference between paddling and packing up early.
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