• BAK BAKFlip MX4
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BAK

BAK BAKFlip MX4 Hard Folding Tonneau Cover 2021-2026 Ford F-150 5.5ft

BAK BAKFlip MX4 Hard Folding Tonneau Cover 2021-2026 Ford F-150 5.5ft

$1,199.99 USD
$1,199.99 USD
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448339

In stock
  • Calculated shipping — oversized item
  • Ships in 1–2 business days
  • 30-day hassle-free returns
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Key Features

  • Aluminum panels over a high-density polymer core for durability
  • Auto-latching panels secure the cover automatically when closed
  • Folds flat against the cab for 100% bed access
  • EPDM perimeter seals and tight-fit clamps for a strong weather seal
  • Dual-action tailgate seal weatherproofs the tailgate without sacrificing function
  • Rated for up to 400 lbs evenly distributed when closed
  • No-drill clamp-on installation
  • Fits the 5.5ft bed including Raptor and Lightning; backed by a 5-year limited warranty

The BAK BAKFlip MX4 (448339) is a hard folding aluminum tonneau cover for the 2021-2026 Ford F-150 with the 5'7" (5.5ft) bed, including Raptor and Lightning trims. It pairs rugged aluminum panels with an auto-latching design for security plus full bed access.

Key Benefits

  • Aluminum panels over a high-density polymer core for durability and strength
  • Auto-latching panels secure the cover every time you close it
  • Folds flat against the cab for 100% bed access
  • EPDM perimeter seals and tight-fit clamps deliver a strong weather seal
  • Dual-action tailgate seal weatherproofs the tailgate while preserving full function
  • No-drill clamp-on installation

Specifications

  • Brand and line: BAK BAKFlip MX4 (Gen 3)
  • Part number: 448339
  • Material: aluminum panels with high-density polymer core
  • Finish: matte black textured
  • Weight capacity: 400 lbs evenly distributed
  • Bed length: 5'7" (5.5ft)
  • Warranty: 5-year limited

What's Included

  • BAKFlip MX4 folding tonneau cover
  • Clamp-on mounting rails and hardware
  • Installation instructions

Fitment

Engineered for the 2021-2026 Ford F-150 with the 5'7" (5.5ft) bed, including the F-150 Raptor and the 2022-2026 F-150 Lightning. It is bed-length specific and does not fit the 6.5ft or 8ft beds. For the 6.5ft F-150 bed, use BAK 448337.

FAQ
Does the 448339 fit the F-150 Raptor and Lightning?

Yes. It fits the 2021-2026 F-150 Raptor and the 2022-2026 F-150 Lightning, which use the 5'7" bed.

Which bed length does it fit?

Only the 5'7" (5.5ft) bed. It does not fit the 6.5ft or 8ft F-150 beds.

Is drilling required to install it?

No. The MX4 clamps to the bed rails with the included hardware and needs no drilling.

Vehicle Fitment
Years Make Model Submodel
2021–2026 Ford F-150 —

Specifications
weight
56.0 lbs
dimensions
70.3 L × 23.6 W × 7.5 H in

Shipping & Returns

Free shipping on orders $250+ (standard items). Oversized items ship at calculated rates.

30-day returns with RMA required. 15% restocking fee, buyer pays return shipping. Defective items returned free with full refund.

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