BAK BAKFlip MX4 Hard Folding Cover — F-150 5'7" (2015-2020)
Best for: The best hard folding cover for a work truck
Aluminum panels, a matte finish that does not chalk, and it folds flat against the bulkhead so you can still carry tall cargo. For a truck that needs security most days and open-bed capacity some days, a hard tri-fold is the correct compromise and the MX4 is the one to buy.
Who should skip it. It is not a locking vault. The cover latches, but a determined thief gets through any folding panel cover. Valuable tools belong in a steel box under the cover, not loose beneath it.
- Protection
- 9.2
- Weather seal
- 8.8
- Install
- 9.0
- Durability
- 9.2
- Value
- 7.4
What works
- Folds flat to the bulkhead — full bed height still available
- Aluminum panels shed snow load that a soft cover sags under
- Matte finish does not fade to gray the way gloss vinyl does
- Clamp-on install with no drilling
What does not
- Expensive relative to a soft tri-fold
- Latches deter, they do not secure
- Folded panels sit at the bulkhead and block the front third of the bed
Published specifications
- Fitment
- Ford F-150 2015-2020, 5'7" bed (67.1 in)
- Type
- Hard folding, tri-fold
- Panels
- Aluminum
- Part number
- 448329
- Published load rating
- Not published
Figures from the Manufacturer listing.
Fits
- Ford F-150, 2015-2020, 5'7" bed
Does not fit
- 2021+ F-150 — separate part number
- 6'5" and 8 ft F-150 beds
- Beds with a crossover tool box already fitted (needs a notched cover)



