--- product_id: 394917 title: "FCS Longboard Box Adapter" brand: "fcs" price: "$75.57" currency: USD in_stock: true reviews_count: 8 category: "Fcs" url: https://www.desertcart.ec/products/394917-fcs-longboard-box-adapter store_origin: EC region: Ecuador --- # Quick fin setup change in seconds Adjustable fit for deeper longboard boxes Preferred by world-class surfers & shapers FCS Longboard Box Adapter **Brand:** fcs **Price:** $75.57 **Availability:** ✅ In Stock ## Summary > 🏄‍♂️ Upgrade your ride, dominate every wave! ## Quick Answers - **What is this?** FCS Longboard Box Adapter by fcs - **How much does it cost?** $75.57 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/394917-fcs-longboard-box-adapter) ## Best For - fcs enthusiasts ## Why This Product - Trusted fcs brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable & Lightweight:** Engineered for strength without adding bulk—only 0.1 lbs - • **Pro-Grade Performance:** Trusted by elite surfers, delivering flawless stability and maneuverability - • **Precision Adjustable Fit:** Customizable adapter depth ensures a perfect fit for various longboard boxes - • **Game-Changing Versatility:** Switch from single fin to thruster setup effortlessly and ride every wave your way - • **Seamless Thruster Conversion:** Transform your longboard fin setup in seconds for ultimate wave control ## Overview The FCS Longboard Box Adapter is a precision-engineered accessory designed in collaboration with top surf athletes and shapers. It allows surfers to quickly convert a traditional longboard single fin setup into a high-performance FCS thruster configuration. Adjustable for deeper fin boxes, lightweight at just 0.1 pounds, and backed by a limited warranty, this adapter enhances board versatility and is a favorite among professional and passionate surfers alike. ## Description Allows you to change from a traditional longboard fin to a FCS thruster set up in secondsPerfect for loosening up your longboardThe adapter is adjustable for deeper longboard boxes Review: Perfect FCS adapter - Initially, I ordered a custom mid-length surfboard with a box setup to use a single fin and optional stabilizers. But then I decided to test the Thruster setup, and it ended up working so much better than I expected! The FCS adapter is perfect, it fits seamlessly, performs flawlessly, and I haven’t taken it off my board since. A total game changer! Review: Worked great - The fin into the adapter is a tight fit. Some lithium grease helped. The adapter to fin box was tight also, so i took some sand paper and smoothed the sides of the adapter a little, then a bit of grease on it also. Very happy with this. I turned my long board single fin into a thruster setup.. ## Features - Designed in collaboration with the world's leading surf athletes and surfboard shapers, the FCS range offers a diverse range of surfboard accesories suited to a variety of board models, wave conditions and surfing styles. FCS fins are the preferred choice by the world’s best surfers and shapers. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003JCL5XW | | ASIN | B003JCL5XW | | Best Sellers Rank | #177,498 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #60 in Surfing Fins | | Brand Name | FCS | | Closure Type | Backstrap | | Customer Reviews | 4.1 4.1 out of 5 stars (58) | | Date First Available | September 30, 2009 | | Department | unisex | | Handle Type | Adjustable | | Is Discontinued By Manufacturer | No | | Item Weight | 0.1 Pounds | | Item model number | model | | Manufacturer | FCS | | Manufacturer | FCS | | Manufacturer Part Number | 10067 | | Manufacturer Warranty Description | Limited Warranty | | Model Number | model | | Pattern | Solid | | Pocket Description | Stash Pocket | | Shell Type | Soft | | Size | One Size | | Sport Type | Surfing | | Strap Type | Adjustable | | Style Name | Hardware | | Unit Count | 1 Count | ## Images ![FCS Longboard Box Adapter - Image 1](https://m.media-amazon.com/images/I/61dAU5tg2bL.jpg) ## Questions & Answers **Q: Will this item fit securely in a powerbox fin box** A: No, this adapter is built to fit in a US Box (not a Power Box). The fin tab is its giveaway. A Power Box doesn't have a slot for the tab, and it's deeper. It's hard to imagine making this product work in a Power Box. **Q: How are the fins fixed into ? I don't see any screw holes (like in normal fcs1 boxes).** A: Hello, Because this adapter slides into a center fin box the grub screws aren't located on the side of the adapter. There are actually 3 grub screws included that are located on the front, back and bottom of the adapter. If you have any other questions please let me know. Thank you **Q: Can you adjust the fore and aft positioning of the FCS fin in the adapter?** A: The FCS fin cannot be moved within the adapter, ...but the adapter can be moved fore and aft within the longboard fin box just as you would a long board fin. **Q: Can someone tell me the exact length of the adapter? wondering if it will fit an inflatable sup with a shorter-than-useful box.** A: 5 inches ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perfect FCS adapter *by S***Y on February 22, 2025* Initially, I ordered a custom mid-length surfboard with a box setup to use a single fin and optional stabilizers. But then I decided to test the Thruster setup, and it ended up working so much better than I expected! The FCS adapter is perfect, it fits seamlessly, performs flawlessly, and I haven’t taken it off my board since. A total game changer! ### ⭐⭐⭐⭐⭐ Worked great *by M***R on June 5, 2024* The fin into the adapter is a tight fit. Some lithium grease helped. The adapter to fin box was tight also, so i took some sand paper and smoothed the sides of the adapter a little, then a bit of grease on it also. Very happy with this. I turned my long board single fin into a thruster setup.. ### ⭐⭐⭐⭐ delivered on time and wells pretty well *by G***S on April 12, 2013* purchased for a surf sup... installed without problem and allow versatility of dropping in my surfboard fcs fins in my surf sup.... great idea, great product, good price. only complaint.... and total disclosure... i own a surf shop and ordered this for myself when we were out of stock.... we have had a problem with these being too deep.... much like some longboard fins we get in... the adapter where it screws tight into the board is sometime thicker than the longboard/sup box.... meaning you can tighten down and still not have pulled tight in box but have tab pulled tight to bottom of adapter.... this leaves adapter or fin felling loose and able to slide... if this happens you need to sand the adapter down to where it's thickness is less than the track in box's thickness... no big deal but it is a problem we have seen and if you know how to fix... then it's not a serious issue only an inconvenience that can be fixed in minutes. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ec/products/394917-fcs-longboard-box-adapter](https://www.desertcart.ec/products/394917-fcs-longboard-box-adapter) --- *Product available on Desertcart Ecuador* *Store origin: EC* *Last updated: 2026-06-03*