The BAK BAKFlip MX4 is a hard-folding aluminum tonneau cover for the 2014-2020 Chevrolet Silverado 1500/1500 LD/2500 HD/3500 HD & GMC Sierra 1500/2500 HD/3500 HD with the 6ft 6in bed. Its heavy-duty aluminum top panels are reinforced with high-density polymer cores for a 22 percent strength increase over the original MX4, and a patented automatic latching system secures the cover when it is closed. EPDM perimeter seals, tight-fit clamps and a dual-action tailgate seal keep water out, and the panels fold flush against the cab for full bed access. It installs on the factory bed with no drilling.
- Type: hard-folding tonneau cover
- Construction: heavy-duty aluminum top panels with high-density polymer cores, 22 percent stronger than the original MX4
- Finish: textured matte black
- Security: patented automatic latching system
- Weather protection: EPDM perimeter seals, tight-fit clamps and a dual-action tailgate seal
- Weight capacity: 400 lbs evenly distributed
- Bed access: folds flush against the cab for 100 percent bed access
- Install: one-person, no-drill
- Warranty: 5-year
- Bed length: 6ft 6in
- Part number: BAK448121
Vehicle Applications
Fits the 6ft 6in bed on the following:
- 2014 Chevrolet Silverado 1500
- 2015 Chevrolet Silverado 1500
- 2016 Chevrolet Silverado 1500
- 2017 Chevrolet Silverado 1500
- 2018 Chevrolet Silverado 1500
- 2019 Chevrolet Silverado 1500 LD
- 2015 Chevrolet Silverado 2500 HD
- 2016 Chevrolet Silverado 2500 HD
- 2017 Chevrolet Silverado 2500 HD
- 2018 Chevrolet Silverado 2500 HD
- 2019 Chevrolet Silverado 2500 HD
- 2020 Chevrolet Silverado 2500 HD
- 2015 Chevrolet Silverado 3500 HD
- 2016 Chevrolet Silverado 3500 HD
- 2017 Chevrolet Silverado 3500 HD
- 2018 Chevrolet Silverado 3500 HD
- 2019 Chevrolet Silverado 3500 HD
- 2020 Chevrolet Silverado 3500 HD
- 2014 GMC Sierra 1500
- 2015 GMC Sierra 1500
- 2016 GMC Sierra 1500
- 2017 GMC Sierra 1500
- 2018 GMC Sierra 1500
- 2019 GMC Sierra 1500 Limited
- 2015 GMC Sierra 2500 HD
- 2016 GMC Sierra 2500 HD
- 2017 GMC Sierra 2500 HD
- 2018 GMC Sierra 2500 HD
- 2019 GMC Sierra 2500 HD
- 2020 GMC Sierra 2500 HD
- 2015 GMC Sierra 3500 HD
- 2016 GMC Sierra 3500 HD
- 2017 GMC Sierra 3500 HD
- 2018 GMC Sierra 3500 HD
- 2019 GMC Sierra 3500 HD
- 2020 GMC Sierra 3500 HD
FAQ
What is the BAK BAKFlip MX4?
It is a hard-folding aluminum tonneau cover with a textured matte black finish for the 2014-2020 Chevy Silverado 1500/1500 LD/2500 HD/3500 HD & GMC Sierra 1500/2500 HD/3500 HD with the 6ft 6in bed.
Can I still use the full bed?
Yes. The panels fold flush against the cab for 100 percent bed access, and the closed cover holds up to 400 lbs evenly distributed.
Is it weatherproof?
It uses EPDM perimeter seals, tight-fit clamps and a dual-action tailgate seal to keep water out.
Does it require drilling to install?
No. It is a one-person, no-drill installation that clamps to the factory bed rails.