4mm Center Fin Hex Flat Head Screw & Plate with Fin Key

4mm Center Fin Hex Flat Head Screw & Plate with Fin Key

Secure, corrosion-resistant hardware for center fins and longboard setups

Keep your center fin locked in and surf-ready with this 4mm stainless steel hex flat head screw and plate, supplied complete with fin key. Designed for standard longboard and center fin boxes, this fin hardware set delivers a low-profile, flush fit that holds firm in everything from small peelers to solid point surf.

Built for durability in saltwater environments, the screw resists corrosion and stripping, while the flat head design sits cleanly against the fin base—reducing drag and preventing loosening during long sessions.

Perfect as a replacement fin screw, spare hardware, or workshop essential.

Key Features

• 4mm hex flat head screw for secure center fin installation

• Marine-grade stainless steel – corrosion resistant

• Low-profile flat head design sits flush against fin base

• Includes fin plate + fin key – ready to install out of the pack

• Compatible with standard longboard / center fin boxes

• Ideal for single fins, 2+1 setups, and longboards

What’s Included

• 1 × 4mm Hex Flat Head Fin Screw

• 1 × Fin Plate

• 1 × Fin Key (Allen key)

Compatibility

✔ Fits standard longboard fin boxes
✔ Suitable for center fins and single fin setups
✖ Not compatible with tool-less fin systems (e.g. FCS II)

Why This Fin Screw Matters

A quality fin deserves secure hardware. This 4mm center fin screw ensures your fin stays exactly where you set it—no rattling, no mid-session adjustments, no surprises. Whether you’re tuning fin placement for noseriding or just replacing a lost screw, this set delivers reliability session after session.

FAQs

Will this fin screw fit my surfboard?
If your board uses a standard longboard or center fin box, this 4mm screw and plate will fit perfectly.

Is the fin key included?
Yes. This set includes a matching fin key, so you can install or adjust your fin immediately.

Is the screw rust-resistant?
Yes. The screw is made from marine-grade stainless steel, designed to withstand saltwater use when rinsed after surfing.

Prompt Australian Dispatch: All items are sent from stock held in Sydney.

Faster Express Shipping with tracking and insurance just $10 per order at checkout.