448339 is the BAKFlip MX4 (Gen 3) Hard Folding Tonneau Cover sized for the 2021-2026 Ford F-150 and F-150 Raptor, 2022-2026 F-150 Lightning with a 5'7" bed. The hard panels protect your cargo from weather and prying eyes, and the folding design opens the bed in one move.
The BAKFlip MX4 is BAK's step-up folding cover. This Gen 3 version adds stronger panels, a tighter seal and a re-engineered auto-latch.
The F-150 bed does a lot of different jobs. A hard cover protects the cargo on the way, and opens fully for the jobs that need the space.
Heavy-duty where it counts. Multi-layer aluminum panels, a high-density polymer core and precision-engineered side rails make this Gen 3 cover 22% stronger than the original MX4, with a 400 lb evenly distributed load rating.
More for rain and road spray to get past. Updated EPDM perimeter seals, tight-fit clamps, a longer dual-action tailgate seal on most applications and an integrated drainage system all work to keep the bed dry.
Open the bed, keep the cover. Drop the tailgate, release the rear latch, and fold the cover up against the cab for 100% bed access, even for large cargo. Re-engineered prop rod clips hold it open, premium rubber bumpers protect the cab and the cover, and the third brake light stays visible in every position.
A low, tidy profile. Textured matte black on every component and a flush fit with the rails make the cover look like it belongs on the truck.
Close it and walk away. The auto-latch does the locking, and the re-engineered lock components give this generation better resistance to forced entry than the last.
Assembled in the USA and covered by a five-year limited warranty, the BAK 448339 is the Gen 3 upgrade for owners who want a stronger, tighter-sealing folding cover. Order it from Track Ready Products and check the bed length above.
Bolt-on, click-in mounting keeps the install simple: one person, basic hand tools, usually 30 minutes or less, and the hardware is in the box.
Clean the bed rail caps first so the seals sit on a clean surface, set the cover in place, and tighten the clamps evenly from side to side. Work the cover open and closed once before you load the bed.
Recheck the clamps after about a week, wash with mild automotive soap and water, and clear off snow and ice before opening. Keep the cover secured at all points whenever you drive.
