The BAK Industries BAKFlip MX4 (part number 448337) defines the hard-folding tonneau cover category and continues to set the benchmark for strength, security, and weather protection on the 2021-present Ford F-150 with a 6.5-foot cargo bed. The BAKFlip MX4 448337 features GEN 3 polymer-reinforced multi-layer aluminum panels that are 22 percent stronger than the original MX4 design, a patented auto-latch system that locks the moment the cover closes, and a full matte-black textured finish across all panels and hardware. Whether for work, daily driving, or off-road adventure, the 448337 protects your cargo with the industry's only hard-fold cover design that never blocks the third brake light.
| Year | Make | Model | Trim | Bed Size |
|---|---|---|---|---|
| 2021 | Ford | F-150 | XL, XLT, Lariat, King Ranch, Platinum, SSV | 6.5' |
| 2022 | Ford | F-150 | XL, XLT, Lariat, King Ranch, Platinum, SSV | 6.5' |
| 2023 | Ford | F-150 | XL, XLT, Lariat, King Ranch, Platinum, SSV | 6.5' |
| Specification | Detail |
|---|---|
| Part Number | 448337 |
| UPC | 819275017367 |
| Cover Series | BAKFlip MX4 GEN 3 |
| Panel Material | Polymer-reinforced multi-layer aluminum over high-density core |
| Finish | Textured matte black across panels and all hardware |
| Bed Length | 6.5' (78") |
| Panel Count | 4 |
| Weight Capacity | 400 lbs evenly distributed |
| Seal Type | Re-engineered EPDM perimeter seals with dual-action tailgate seal |
| Assembly | Assembled in the USA - Missouri |
| Warranty | 5-Year Limited |
| Hardware Included | Yes - click-in mounting system, no drilling required |
Does the BAKFlip MX4 448337 fit the 2021 F-150 Regular Cab, SuperCab, and SuperCrew?
Yes. The 448337 fits all cab configurations of the 2021-present F-150 that have the 6.5-foot bed, including Regular Cab, SuperCab, and SuperCrew models.
How does the BAKFlip MX4 448337 lock?
The 448337 uses a patented auto-latch system that engages the moment the panel closes - no manual locking action is needed. When the tailgate is shut, the entire bed is secured automatically.
Is the BAKFlip MX4 448337 waterproof?
Yes. Re-engineered EPDM perimeter seals with precision-fit clamps create a tight edge-to-edge barrier. An integrated drain system routes any accumulated moisture away from the cargo area.
What is the weight capacity of the BAKFlip MX4 448337?
The 448337 supports up to 400 lbs of evenly distributed weight on the closed cover surface.
How long does it take to install the BAKFlip MX4 448337?
The GEN 3 click-in design installs 12 percent faster than previous generations and can be completed by one person in under 30 minutes with no drilling required.
Does the BAKFlip MX4 448337 block the 3rd brake light?
No. The BAKFlip MX4 448337 is the industry's only hard-fold design engineered to maintain full 3rd brake light visibility in every position, including the fully open upright position.
Is the BAKFlip MX4 448337 compatible with a bed liner?
Yes. The 448337 uses a clamp-on rail system that attaches to the bed rail top and is compatible with both spray-in and drop-in bed liners.
Where is the BAKFlip MX4 448337 assembled?
The 448337 is assembled in Missouri, USA, and is backed by BAK Industries' 5-year limited warranty.
Prop 65 Warning: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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