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  1. Tonneau Cover
  2. BAK Industries
  3. Fold-Up - Hard
  4. Flush Profile - Inside Bed Rails
  5. Rack Compatible
  6. Aluminum
BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish
BAK Industries

BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish

Part Number: BAK448227RB
In Stock
$1,249.99
Tonneau Cover

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Get style and versatility with this heavy-duty, all-aluminum tonneau. Tri-fold cover sits inside your vehicle's bed rails and secures upright for unrestricted bed access. Tailgate opens and closes with cover up or down. Matte black finish. Great Prices for the best tonneau cover from BAK Industries. BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish part number BAK448227RB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (148)
  • Q & A (0)
  • Videos (2)
  • Photos

BAK Industries Tonneau Cover - BAK448227RB

Highlights

  • Custom Fit for Your Vehicle: Secures to your truck bed with model-specific clamps and hardware
  • Keeps Gear Secure: Lock the tailgate and the hard panels can’t be opened.
  • Full Bed Access: Tri-fold design flips up and props open for hauling big items.
  • Stays Dry in Weather: Matte rubber seals and built-in drain system channel water away.
  • Strong and Durable: 1/2" thick rustproof aluminum panels support up to 400 lbs evenly.
  • Low-Profile Look: Matte black finish sits flush inside bed rails for a clean style.
Made in USA

Features to know about

Full Bed Use: Tri-Fold Aluminum Design

With some covers you have to pull the whole thing off just to haul taller items. The BAKFlip MX4 makes that unnecessary. Its tri-fold aluminum panels flip open in sections, letting you access part or all of your bed in seconds. When you need full space, the prop rods hold it securely upright so you can drive with the bed completely open. The integrated buckle system locks the panels in the folded, flipped up, or closed position, so it stays put on the road.

Secure Cargo: Automatic Latching and Tailgate Integration

Keeping gear safe is simple with the MX4. The panels latch automatically as they close, creating a secure enclosure when your tailgate is shut and locked. The rear seal design even lets you open or close the tailgate whether the cover is open or down, so you don’t have to choose between convenience and security.

Built for the Elements: Matte Finish and Drainage System

Rain, sun, or snow — this cover is ready for it. The matte black rubber seals and built-in drainage system help keep water out of the bed, while the 1/2" thick rustproof aluminum panels are resistant to scratches, scuffs, and UV rays. The premium density foam core adds strength without adding weight, and the rustproof aluminum rails with a black powder coat finish keep everything solid and corrosion-free.

Sleek Look and Easy Fit: Low-Profile Mounting

The MX4 sits flush inside the bed rails for a clean, low-profile appearance. Because it mounts inside the rails, you can still use stake-pocket-mounted accessories or raised side rails without interference. It installs easily with no drilling — just clamp it on and bolt the front hinge rail to the frame rails using the included hardware.

Strong and Practical: 400-lb Capacity

This cover isn’t just for looks. It’s rated to hold up to 400 lbs of evenly distributed weight, so it can handle extra gear or light loads on top when needed. The durable aluminum panels and aircraft-grade rails give it the strength to last through years of hauling and weather.

Specs

Construction and Material

  • Material: Aluminum
  • Panel Thickness: 1/2"
  • Panel Type: Rustproof aluminum with premium density foam core
  • Finish: Matte black, scratch-, scuff-, and UV-resistant
  • Rails: Aircraft-grade, rustproof aluminum with black powder coat finish

Design and Function

  • Style: Tri-fold, low-profile design sits inside truck bed rails
  • Operation: Prop rods secure folded cover upright for full bed access
  • Latch System: Automatically latching panels
  • Tailgate Compatibility: Tailgate opens and closes with cover up or down
  • Accessory Compatibility: Works with stake-pocket-mounted accessories and raised side rails

Performance

  • Load Rating: Up to 400 lbs of evenly distributed weight
  • Weather Protection: Matte black rubber seals and built-in drainage system help keep water out
  • Aerodynamics: Aerodynamic style reduces wind drag, improving gas mileage

Installation

  • Installation Type: No-drill
  • Mounting: Latches to brackets in top channels of OEM track system
  • Hardware: Included bolts secure front hinge rail to frame rails

General Information

  • Manufacturer: BAK Industries
  • Made in: USA
  • Warranty: 5-Year warranty

448227RB BAK Industries BAK Flip MX4 Hard Folding Truck Bed Cover

Installation Details BAK448227RB Installation instructions

This Product Fits The Following Vehicles

  • 2019 - 2028 Ram 1500 5-1/2 Foot Bed - with RamBox



Video of BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish
Video Thumbnail Video Player Dialog

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for BAKFlip MX4 Hard Tonneau Cover 30 Second Overview

Katie Osborne: Katie Osborne with trucks hero here to tell you what makes this Backflip MX for the number one selling hard truck bed cover on the market. The aluminum encased panels provide security and weather protection when closed. And when folded open, it provides full bed access, plus you can then drive it around town by securing it with a prop rod. And of course, this low profile matte black finish looks great on any truck.

Ratings & Reviews

4.6

148 reviews
Review sort icon
Get style and versatility with this heavy-duty, all-aluminum tonneau. Tri-fold cover sits inside your vehicle's bed rails and secures upright for unrestricted bed access. Tailgate opens and closes with cover up or down. Matte black finish.

by:

The cover has been great. I would buy it again. The only gripe from me is that for some unknown reason, one screw rusted ( as shown in the attached photo ). Why one, and not the other 3 ?? who knows...



by:

Good quality product in easy to install.



by:

I have owned this cover for over a year and it has been excellent. It keeps the bed fairly dry as expected and I have had no mechanical issues with it as it still performs like new. I would say the only improvement I would suggest is better foam weather striping for the front of the bed as the original never stuck to the spray in liner very well and eventually came lose and then I just swapped with some similar weather striping I bought locally.



by:

Love the MX4 ...Took a little longer to install but looks great...



by:

Solid performance. Only issue is with the glue holding the pads is failing



by:

I really love the bakFlip cover. It locks up all my stuff when we are on the road. I really like the looks too.



by:

I own three of these on three different trucks. The two I purchased this year and last year are not as good quality as the one I purchased in 2023.For the price they are feeling pretty cheap now and parts are falling off. Latch covers and rubber par to rest the top on when folded up have fallen off on both of the covers. I will not be buying these brand covers again.



by:

the bedcover finally came in.
Few pictures
of it installed.



by:

I replace a camper shell with the tonneau cover because it is easier to remove when I want to put my pickup camper on the pickup. I am very happy with the cover and am glad I made the switch.



by:

Excellent product! Wait time was crazy but manufacturer is to blame on that one!



by:

I am a huge fan of the BAKFlip. The installation was pretty straight forward and easy. Anybody with moderate mechanical ability can install. I think it took less than 2 hours. I live in a heavy snow area and had more than 24” of snow on it at one point and the product performed flawlessly.



by:

The cover functions ok. The tailgate leaks quite a bit. The manufactured edges that where cut were sharp and not painted or treated. The weather strip along the edges has already discolored/faded. Disappointed in the fading and less than ideal sharp edges. Somewhat expected leaks, but not this much. Average at best rating, especially for the price.



by:

Install was smooth and got a timely note when it was completed



by:

I installed the BAKFlip MX4 in my RAM 2500 Crewcab has the 6' 1/2 short bed, drived 300 miles now. good product, open and close the tailgate without lifting up the cover



by:

Great fit on a Ram 2500 long bed. Everything stays dry on the inside.



by:

Great tonneau cover. Fits as it should.



by:

Purchased this BAKFlip for my new 22 RAM Classic 1500. Installation went well, instructions were good to follow, and it fit perfectly. One of the plastic hold down clips had a manufacturer defect with excess plastic mold residue inside the clip that prevented it from properly working. I sent an online warranty claim explaining the problem, and a new clip was sent to me in a reasonable amount of time, and it worked fine. After one year of using the cover, I am very happy with it. Everything functions as it should, and it is very versatile. While it is not 100% watertight, I mostly notice a small amount of leakage around the tailgate seal after washing the truck. Under normal rainy weather, there is no leakage, and we get plenty of rain in the PNW. My four-star rating rather than a 5 star is only because of the manufacturer defect and the curling of one of the rubber cushions on the underside of one of the panels where the adhesive holding it on the edges has not held up under the hot weather (with the black color, when the sun beats down on the cover it gets pretty toasty inside the truck bed with the cover closed). I am thinking that should be an easy fix by applying some good adhesive and taping in place until the adhesive cures. Just haven't gotten around to doing it. Again, really like this cover. Would recommend it to others, and if I ever have a need for one in the future, would definitely not hesitate getting another BAKflip.



by:

I have been using this cover for almost a year now, and am very pleased with it. It looks and fits great, and it is secure and keeps most of the bed dry in the rain. A couple of rubber trip bits have needed some improved securing, and I used a little RTV so it was easy. I drove it across the country round trip last summer and it was perfect. I would recommend this cover for a great-looking and pretty secure cover. Finally, it is easy to fold forward when it is time to haul loads taller than the bed rails.



by:

So after a year I am still loving this bed cover. Had the fiberglass version for my 2013 F-150 and loved it as well, that's why I purchased this one for my 2019 Super Duty, it was also the first accessory I purchased for it because I was so used to my other one and knew I couldn't live without it. I never installed the drain tubes on either covers and still haven't had water get it my bed. Also the folks at etrailer are always awesome! Thanks again!



by:

BAKFlip MX4 is a great addition to any pickup. It allows for secure transport of material, keeping it dry in bad weather and yet readily accessible with the flip of a panel. It also keeps the weather away from your 5th wheel hitch. Can be left on when towing.



by:

The bed cover has been great so far. Followed the instructions and took my time adjusting it and it has been working well. Keeps the bed dry and looks good. I did have to order an extra kit to get enough rail clamps. Once I put the extra clamps on it feels much more secure. For 8ft beds they need atleast 8 to 10 clamps, not 6. The cover has been working in that I don’t have to uncover the whole bed to use it. I just need to open up as much as I need at the time.



by:

Ordered the BAKFlip MX4 for my son on 12/15 after calling to verify the tonneau would arrive by Christmas. Then received an email that said "Your order has been forwarded to one of our partners for direct shipment to you" and never received another shipping update or any tracking info. Finally on 12/22 I emailed Etrailer.com who told me they didn't know when I would get it. The Tonneau finally arrived on 12/29, 3 days after my son returned to California (he drove his truck, 2100 miles). He won't be back till next Christmas so I have to figure out how to return this product. I had several other buying options to get this here by Christmas, but went with Etrailer because of their reputation. This will be my last purchase from Etrailer.com.



by:

Bought it used.. I asked if it was complete undamaged.. It arrived complete including a scratch on the inside cover.. I'm glad it wasn't on the outside cover. Shipping was quick. Installation was fairly straight forward



by:

I love how this tonneau cover works. because it allows use of almost the entire bed of the truck when it's fully open. I was a little disappointed with the clamps for installing the side rails, as they didn't seem as robust as the clamps in the cover I bought for my last truck. However, I am happy with its operation, and the fact that the truck bed is a locked compartment when I lock the tailgate.



by:

Overall, I am very pleased with my BAKFlip MX4. It has held up well after 1 year. It works well and looks good. It matches my matte black accessories and trim. It was fairly easy to assemble but I did have some tight fitment issues near the cab where the cover connects to the rail. I really like the security of the hardtop and access through the tailgate. Water is generally kept out, but sometimes there are water drips near the tailgate depending on the angle parked. So this cover keeps the bed *mostly* dry.
etrailer was very fast to deliver my cover, and it came in good condition.


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See what our Experts say about this BAK Industries Tonneau Cover

  • Will Tonneau Cover for 2015 Ram 1500 Fit With RamBox
    Hey William! I'm assuming you mean the RamBox since that is the Ram cargo management system. You looked at a few different covers, and I can't see what was in your cart, but I can tell you the following will fit the 5-1/2' bed with the RamBox: -PowertraxPRO MX Hard Tonneau Cover - Powered - Aluminum - Matte Black # RT90244 -BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish # BAK448227RB If you were asking about a different tonneau cover let me know in the comments below.
    view full answer...
  • Tonneau Cover Recommendation for 2022 Ram 1500 with 5-1/2 Foot RamBox with Utility Track System
    We do have some other options that will fit your application, but the Lomax Hard Tonneau Cover # LOM54FR that you referenced will not fit with the utility rails on your 2022 Ram 1500. For something that does fit the utility rails on your 5-1/2' RamBox bed I recommend checking out the BAKFlip G2 # BAK226227RB or MX4 # BAK448227RB. The G2 has the glossy aluminum finish while the MX4 has the durability of the aluminum but the matte finish so it's a little more subtle and sleek looking. These...
    view full answer...
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  • Does BAKFlip MX4 Tonneau Cover Work w/ Spray-In Bedliner on 2020 Ram 1500 w/ 5-1/2 Foot Bed & RamBox
    The BAKFlip MX4 Hard Tonneau Cover # BAK448227RB for your 2020 Ram 1500 will work with the LineX spray-in bedliner you have. That said, you are going to want to be sure you clean it very well before applying the seal, but the manufacturer, BAK Industries, specifically states that the BAKFlip is designed to work with "any" spray-on bedliner like the LineX.
    view full answer...
  • Do I Need Silver Bed Rails to Install a BAKFlip on a 2026 Ram 1500 With RamBox?
    Hey David. You do not NEED to burn the $400.00 for the silver rails. I did some digging and found that you're able to keep your OEM black rails if you choose to go with the BAKFlip G2 Hard Tonneau Cover # BAK226227RB. This cover is a confirmed fit for your Ram Boxes and black rails. Now, If you choose to go with the BAKFlip MX4 Hard Tonneau Cover # BAK448227RB then you will need to spend the money on the upgraded silver rails. Since your concern is security, there is no significant...
    view full answer...

Do you have a question about this Tonneau Cover?


Info for this part was:

Employee Tyler C
Edited by:
Tyler C
Employee Joshua S
Video Edited:
Joshua S
Employee Zach D
Video Edited:
Zach D
Employee Wilson B
Updated by:
Wilson B
Employee Noah M
Updated by:
Noah M
Employee Ronnie R
Written by:
Ronnie R

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