BAK BAKFlip MX4 Hard Folding Tonneau Cover for Ford F-150 (2021-2026)
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Warranty Information
Vendor warranty summary
BAK Warranty
At a glance: Five years on BAKFlip MX4, F1 and Revolver X4s; three years on BAKFlip G2, FiberMax and Revolver X2; one year on the BAKBox. Original purchaser only.
This is BAK's warranty, not an NVMOS policy. We've summarized it in plain English to save you a search. The manufacturer's official terms always govern and can change without notice. Last reviewed on nvmos.com: November 4, 2026.
Coverage by product line
| BAK product | Coverage |
|---|---|
| BAKFlip MX4 | 5 years |
| BAKFlip F1 | 5 years |
| Revolver X4s | 5 years |
| BAKFlip G2 | 3 years |
| BAKFlip FiberMax | 3 years |
| Revolver X2 | 3 years |
| BAKBox | 1 year |
What's covered
- Structural defects in material and workmanship, from the retail purchase date
- The original purchaser, with registration on file or a detailed, dated receipt
What's not covered
- Owners after the original purchaser; the warranty is nontransferable
- Returns of non-defective covers once installation has taken place
- Products shipped back to BAK without prior authorization, which may be refused or returned at your expense
How to make a BAK warranty claim
- Return the defective cover to the place of purchase during the warranty period, or submit a claim through BAK's warranty claim form on RealTruck.
- Provide the order number, your name, address, phone and email, vehicle year, make and model, and the product name or part number.
- Describe the problem and include a copy of the original receipt and photos of the product.
- Get authorization from BAK before shipping anything back.
BAK contact: BAK (RealTruck): 877-216-5446; warranty policy, claim form and registration at https://realtruck.com/bak-warranty · Warranty page
Bought it from NVMOS? Start with us.
BAK's first route for a claim is the place of purchase, and it wants the order number, a dated receipt and photos, which we already have or can gather with you. Contact NVMOS first and we will build the claim, get BAK's authorization and work with RealTruck on the repair or replacement. Have your order number and a few photos of the issue ready, then call or text us at (920) 249-7744 or send us a message.
Shop BAK at NVMOS
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See all BAK products, lead times and FAQs →
Disclaimer: The information on this page describes BAK's own warranty policy. It is not a warranty offered by NVMOS (No Visible Means of Support LLC). Manufacturers update their terms at any time; we review these pages periodically, but the manufacturer's current official policy is the one that applies to your claim. Sources: BAK warranty policy and registration (RealTruck, official) and BAKFlip MX4 vs. BAK Revolver X4s comparison: construction, access, made in USA (RealTruck, official) and BAK Industries digital catalog, Aug 2021: construction and load ratings (official document, hosted on a Shopify CDN) and TORA member spotlight: UnderCover and BAK Industries (SEMA). Last updated on nvmos.com: November 4, 2026. See our return policy for NVMOS's own terms.
About the brand
BAK makes hard tonneau covers, from the BAKFlip folding covers to the Revolver rolling covers, and is one of the RealTruck brands, which runs its warranty and support. At NVMOS we carry BAKFlip MX4, G2, F1 and FiberMax covers and Revolver X4s, X4ts and X2 covers for the pickups we support.
Made in: USA, with globally sourced materials (per RealTruck for the BAKFlip MX4) · Lead time: In-stock parts ship in 1-3 business days; parts stocked at the manufacturer take about 1-2 weeks.
Shop all 271 BAKWarrantyAll brands
Warranty terms are set by BAK, not NVMOS, and can change. Bought from us? Call (920) 249-7744 and we'll handle the claim with the brand.
BAK BAKFlip MX4 Hard Folding Tonneau Cover for Ford F-150 (2021-2026)
The BAK BAKFlip MX4 is a hard folding tonneau cover that fits the Ford F-150 (2021-2026) in the bed lengths listed above, including the Lightning. This is the third-generation MX4, with aluminum top panels and side rails over polymer cores, revised EPDM seals and a textured matte black finish. It suits owners who want a flush, lockable hard cover that still opens to the full bed.
| Spec | Detail |
|---|---|
| Fitment | Ford F-150 (2021-2026) |
| Bed length | 5'7", 6'7", 8'2" |
| Style | Hard folding tonneau cover |
| Construction | Aluminum panels with high-density polymer cores |
| Finish | Textured matte black |
| Generation | GEN 3 |
| Part number | 448339, 448337, 448338 |
Measure your bed and confirm it matches the bed length you choose before ordering. Installation instructions are available. BAK install instructions: download the PDF. Not sure it fits your build? Call or text us at (920) 249-7744 with your year, trim and setup and we will confirm it.
Will it fit my truck?
It fits the Ford F-150 (2021-2026) in the bed lengths listed above, including the Lightning.
Does it sit above the bed rails?
No. It sits flush with the bed rails.
Can I still use my tailgate?
Yes. The tailgate keeps its factory function whether the cover is open or closed.
What is the warranty?
See our BAK warranty page for the current terms.
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Specifications
BAK BAKFlip MX4 Hard Folding Tonneau Cover for Ford F-150 (2021-2026) FAQs
Will it fit my truck?
It fits the Ford F-150 (2021-2026) with the 5 ft. 7 in. bed, including the Lightning.
Does it sit above the bed rails?
No. It sits flush with the bed rails.
Can I still use my tailgate?
Yes. The tailgate keeps its factory function whether the cover is open or closed.
What is the warranty?
See our BAK warranty page for the current terms.
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