Bakflip
MX4
The best-selling hard folding tonneau cover in the world — now engineered 22% stronger, weather-tighter, and easier to install than ever.
- 22% Stronger — Gen 3 Build
- Re-engineered Auto-Latch Security
- 30-Minute Install · No Drilling
- 5-Year Hassle-Free Warranty
- Made in America · Missouri
Built to Last.
Proven Everywhere.
Every component of the Gen 3 MX4 was re-engineered from the ground up — tighter seals, stronger panels, faster install, smarter security.
Smarter Lock.
Stronger Hold.
The Gen 3 MX4 features a completely re-engineered patented auto-latch system. Every panel locks and unlocks automatically — no fumbling, no missed latches.
Enhanced components deliver improved forced-entry resistance. Your gear stays secure parked downtown or on a job site.
- Patented auto-latch system
- Improved forced-entry resistance
- All panels lock independently
- No exposed hardware when closed
Built 22% Stronger
Than the Original.
Polymer-reinforced aluminum panels raise the bar on what a hard folding cover can withstand. Tested from –40°F to 180°F and 0–95% humidity — proven in extremes from Alaska to Florida.
- Polymer-reinforced aluminum
- 400 lb evenly distributed capacity
- –40°F to 180°F tested range
- Textured matte black throughout
Fits Tighter.
Keeps Water Out.
Re-engineered perimeter seals and tight-fit clamps deliver superior weather protection — keeping cargo dry through rain, car washes, and everything in between.
An extra-long dual-action tailgate seal adds another layer of protection exactly where it matters most.
- Re-engineered perimeter seals
- Tight-fit clamp mounting system
- Extra-long dual-action tailgate seal
- Integrated water drainage channel
Fits TighterTo Keep Water Out
Improved seals and all-new tight-fit clamps provide state-of-the-art weather protection.
One Person.
30 Minutes.
The Gen 3 MX4 installs 12% faster with an all-new click-in design. No drilling, no cutting, no trimming required on most applications. At 3J's, we handle the whole thing.
- No drilling or cutting required
- All hardware included in the box
- 12% faster — new click-in design
- Professionally installed at 3J's
The MX4 Up Close
MX4 Quick Specs
| Brand | BAKFlip — A RealTruck Brand |
| Style | Hard Folding Tonneau Cover — Gen 3 |
| Material | Polymer-reinforced aircraft-grade aluminum |
| Finish | Textured matte black — all components |
| Weight Capacity | 400 lbs. evenly distributed |
| Temp. Range | –40°F to 180°F · Humidity 0–95% |
| Install Time | 30 minutes or less · Level 1 difficulty |
| Drilling Required | None on most applications |
| Warranty | 5-Year Hassle-Free Limited Warranty |
| Origin | Made in USAAssembled in Missouri |
MX4 FAQ
30 minutes or less. No drilling or cutting required. At 3J's, we handle the entire install professionally — you just drop off the truck.
Yes. Re-engineered perimeter seals and an extra-long dual-action tailgate seal keep your cargo dry through rain, car washes, and everything in between.
Up to 400 lbs of evenly distributed weight on the polymer-reinforced aluminum panels.
Right here — 3J's Auto Body & Paint at 1855 E 29th Street, Signal Hill, CA 90755. Call us at (562) 424-6744. Open Mon–Fri, 8AM–5PM.
5-year hassle-free limited warranty from the original purchase date — direct from BAKFlip.
22% stronger. Polymer-reinforced aircraft-grade aluminum tested from –40°F to 180°F and 0–95% humidity. Proven from Alaska to Florida.
Professional Installation
Since 1991
We don't just sell the MX4 — we install it right. That's been our standard for over 30 years.
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