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

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

Item # BAK48121
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BAK48121 - Hard Tonneau BAK Industries Tonneau Covers
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In Use/Installed

Get style and versatility with this heavy-duty, all-aluminum tonneau. Quad-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. Lowest Prices for the best tonneau covers from BAK Industries. BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish part number BAK48121 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (38)
  • Q & A (14)
  • Photos
  • Why etrailer?

BAK Industries Tonneau Covers - BAK48121

  • BAK Industries
  • Fold-Up Tonneau
  • Hard Tonneau
  • Inside Bed Rails
  • Flush Profile
  • Requires Tools for Removal
  • Aluminum
  • Matte Black
  • Opens at Tailgate

Get style and versatility with this heavy-duty, all-aluminum tonneau. Quad-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.


Features:

  • Custom-fit tonneau cover protects your cargo and your vehicle's bed from the elements
    • Aerodynamic style reduces wind drag, improving gas mileage
  • Quad-fold design allows for partial or full truck bed access in seconds without having to remove cover
    • Prop rods let you secure folded cover in upright position so you can drive with truck bed completely open
    • Integrated buckle system lets you secure the cover in the folded, flipped up, or closed position
  • Low-profile cover sits inside your truck bed rails
    • Compatible with stake-pocket-mounted accessories and raised side rails
  • Automatically latching panels create a secure truck bed when tailgate is closed and locked
    • Rear seal lets you open and close tailgate with cover open or closed
  • Matte black rubber seals and built-in drainage system help to keep water out of bed
  • 1/2" Thick, rustproof aluminum panels are sturdy and durable
    • Premium density foam core adds strength
    • Cover rated to hold up to 400 lbs of evenly distributed weight
  • Matte black finish is resistant to scratches, scuffs, and UV rays
  • Aircraft-grade, rustproof aluminum rails with black powder coat finish create base for tonneau
  • Easy, no-drill installation
    • Frame rails clamp to the inside of your truck bed side rails
    • Included bolts secure front hinge rail to frame rails
  • Compatible with BakBox2 (sold separately)
  • Made in the USA
  • 5-Year warranty


448121 BAK Industries BAK Flip MX4 Hard Folding Truck Bed Cover

Replaces 486121

Installation Details BAK48121 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish - BAK48121

Average Customer Rating:  4.6 out of 5 stars   (38 Customer Reviews)

Get style and versatility with this heavy-duty, all-aluminum tonneau. Quad-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.

- BAK48121
by:

Had it a if a year and this thing takes a beating and it doesn’t have a dent or scratch to show for it. I love it! If your contemplating, don’t! It keeps almost all the water out, except by the tailgate which is normal for any cover. Outstanding product! 663441



- BAK48121
by:

Love the look and the fit of the BAKFlip MX4 but after a light hail storm it is riddled with dents. My 2018 GMC has no damage but the cover does. Bummed..... 817775



- BAK48121
by:
2018 GMC Sierra 1500

A very well built product. Form, fit and function met all expectations. 727292



- BAK48121
by:

It’s worked great. A fellow worker suggested it to me, And one of my sons got one. A second son is hoping to get one soon. I always had a topper, so this is different, But it’s been great and convenient. 482958



- BAK48203
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


The BAKFlip MX4 was easy to install, and does what I need. I like the new style where I can close my tailgate without having to lift it. 523873



- BAK448223
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


Cover is good but water gets in the bed area easily. Don't know if it is the remote tailgate release mechanism or what. 659519



- BAK48203
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


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 489473



- BAK48203RB
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


Its the only one to buy....Spend the money it's worth it 690713



- BAK448332
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


Love the MX4 ...Took a little longer to install but looks great... 642606


Comments
Its still amazing. Works just like its suppose to glad I made the purchase.
Sherry H - 05/19/2020

77052

- BAK48327
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


One year in and this cover is dented all to heck. There are ping marks on the top of it. No way would I recommend this cover or ever buy another one. 721258



- BAK48120
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


Great product. Holding up well after 1 year. Easy to install and still fits great. Had a buckle crack under warranty and it was replaced free of charge and quickly. Great customer service. 719976



- BAK48203
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


I am very happy with my BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish - BAK48203. Really. And the service I received in its regard was top-notch. It did arrive with a non-functioning blemish but I was compensated by the company, immediately. Also, a part broke shortly after I installed it and again, the company stepped up. As for the tonneau cover itself: •it folds open and closed easily as advertised, •I can stand on it if needed, •it keeps out the rain (I've run it through car washes too, and the contents of the bed remain dry, •it was easy to install •I love that concern for locking the bed by closing before/after tailgate is not an issue. 591725



- BAK48427
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


After a year of using the cover I found that there are a few things that could be improved and you can do some of these yourself. The knobs for the cover that actually hold it into the bed-vibrate loose. I added my own lock washers. The poles that you use to hold the cover up when the cover is raised up against the back window-they also vibrate loose-so often that I just removed them and keep them under my seat. The little u-clip pole holders for the poles when not in use-they are too weak-often letting the poles jump out or fall out during normal road driving. The cover itself is not waterproof --it sheds water away mostly however enough gets into the bed that you can not trust your items to be dry. Bag important stuff to keep it dry. The rear weather seal slides back and forth too easily--sometimes working itself out about 2 inches until you see it and slide it back into place--i addenda small amount of silicone to stop this from moving. The cover is strong, looks good and is mostly what I was looking for. Unfortunately I would not buy this again-even more because you have to relocate the bed accessory rails-which then limits the items you can buy for your truck because they are designed for the rails to be in the factory positions. My next cover will be a roll up so that it allows visibility out of the back window. When this cover is flipped up to its final position it completely blocks the rear window. When I was looking at covers-my thought was well its the coolest looking cover and I can deal with not seeing out the back window--well that has changed. It is not practical. The price is high and there are many other options out there that are. My soft roll up tonneau cover was great-waterproof and I could have bought 6 of them for this price. If one was damaged it would have been better to just throw it away and order a replacement. Sorry guys-look elsewhere for a better cover. 739740


Comments
Im sorry to hear about the issues youve had with your BAKFlip MX4. If youre looking to go back to a more traditional style, soft roll-up cover, I recommend checking out the Access TonnoSport # A22050279
Access TonnoSport Soft, Roll-Up Tonneau Cover
$303.58
because it checks a lot of the boxes of things you liked about your previous cover. The TonnoSport is a soft roll up cover that is on the affordable end of the spectrum. It also includes brackets to mount into the OEM rails while they are in their original location.
-- Victoria B - 01/22/2020

64673

- BAK48409
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


937345



- BAK448130
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


Love the BAKFlip. Well-built and easy to work. I did notice, however, that I need to be careful with the foam padding that is attached with sticky tape. It does not always hold. As a result, I have to stick it back on. Will have to figure out a way to make them stick better. Otherwise, I love it! 916553



- BAK48330
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


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. 914709



- BAK48327
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


I had a some trouble putting it on since I had a bed liner on my 2017 Ford F-150. It did have a long scratch on the black paint which is not seen unless I flip it up against the back of the truck cab. Overall the construction quality is very good and it looks like it should last five to eight years under my type of moderate use. 902718



- BAK48330
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


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! 893408



- BAK448131
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


I really like my cover. I do have some water leakage, but I would buy again. 884087



- BAK48307
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


One of the best things I have done and the BAK flip is great 863287



- BAK48203
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


I really love the bakFlip cover. It locks up all my stuff when we are on the road. I really like the looks too. 849040



- BAK48203
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


it looks nice, functions well, but leaks like a sprinkler. 816547



- BAK48126
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


Fits perfect, looks great and virtually waterproof. Be careful, it can dent rather easily. 793812



- BAK48329
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


This is a great cover. I have been very pleased. It was recommended by a friend who loves his cover and I see why. Great product. 793303



- BAK48126
by:

Review from a similar BAKFlip MX4 in Tonneau Covers


this was easy to put on, no problem. you can see in the picture it looks great on my gmc canyon! 791789


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Show More Reviews

Ask the Experts about this BAK Industries Tonneau Covers

  • Best Tonneau Cover Style For Towing A Fifth Wheel
    The best tonneau cover option to use when towing is a retractable cover because it retracts into a canister so it doesn't block any of the view while towing. If you get a fold up cover it will block the cab window. If you get a roll up cover it will interfere with the trailer's overhang especially while turning. If you give me the year make and model of your truck I can make a recommendation.
    view full answer...
  • What Material are the Buckles of the BAKFlip MX4 Hard Tonneau Cover Made Of
    The buckles that you see in the attached picture that are used to secure the tonneau it's folded, flipped up, or closed position are made of plastic.
    view full answer...
  • Dimensions of BAKFlip MX4/F1 When Folded Up on 2017 Chevy Silverado 2500 Short Bed
    Both the BAKFlip MX4 # BAK48121 and F1 # BAK72121 will take up about 26" - 28" from the cab-end of your 2017 Chevy Silverado 2500 short bed. So if your truck bed does measure 6-1/2' (which can slightly vary so you need to confirm on your end) then that leave you with about 52" - 54" of open space. The differences between these covers is that the MX4 has a matte finish on top of the aluminum cover while the F1 has a gloss finish and a fiberglass top on top of the aluminum cover. This...
    view full answer...
  • Height of BAK MX4 Folding Aluminum Hard Tonneau Cover BAK48121 When Folded Up Fully at Cab
    When the BAK MX4 Folding Aluminum Hard Tonneau Cover # BAK48121 that fits your 2017 GMC Sierra 3500 with 6-1/2-foot bed is folded up fully the total height of all panels at the rear of the cab will be approximately 5-inches above the bed rails. My contact at BAK confirmed this height dimension.
    view full answer...
  • Will BAKFlip MX4 Hard Tonneau Cover Clear 5th Wheel Hitch when Closed on 2018 GMC Sierra 2500
    In all likelihood, yes, the BAKFlip MX4 Hard Tonneau Cover # BAK48121 will clear your 5th wheel trailer hitch when the cover is closed. The parts of the cover inside the bed that hang down only do so by about 1.5 inches from the tops of the bed sides. Worse case scenario is you may have to either lower the head on the hitch or just remove the head by unpinning it from the center section.
    view full answer...
  • When Fully Open Do Panels of BAKFlip MX4 Lean Up Against Rear of Truck Cab
    Yes, the panels do lean up against the rear glass of the truck that the BAK Tonneau part # BAK48112 that you referenced installs on. I attached a picture that shows what that looks like. I also attached a review video for this cover for you to check out as well.
    view full answer...
  • Truck Bed Toolbox to Fit with BAKFlip MX4 Tonneau Cover on 2018 Sierra 1500 with 6-1/2 Foot Bed
    Actually we do carry a toolbox specifically designed to fit the BAKFlip MX4 tonneau cover, part # BAK48121, on your 2018 GMC Sierra 1500 with the 6-1/2 foot bed. It's the BAKBox, part # BAK92120. It can be folded down out of the way when you're not using it or turned into just a shelf instead of a box. I've linked a video for you to take a look at. It's with a different tonneau cover but it fits the same wth your MX4.
    view full answer...
  • Recommended BAKFlip MX4 Hard Tonneau Cover for 2017 Chevy 2500 with 6-1/2 Foot Bed
    We just had BAK in last week and the BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish # BAK48121 is the newest model they have available. The part number from the manufacturer matches what you are asking about, our part number is just slightly different. I've attached the installation details for you. They recently started making this model with a tail gate flange that allows the proper seal when you close your tailgate without needing to lift the tonneau. That is...
    view full answer...
  • Recommended BAKFlip Hard Tonneau Cover For 2015 GMC Sierra Denali 2500 HD With 6 1/2' Bed
    For your 2015 GMC Sierra Denali 2500 HD with a 6 1/2' bed I recommend the BAKFlip MX4 Hard Tonneau Cover # BAK48121 due to it being all aluminum which will be extremely durable to the elements and keep the cargo in your bed secured unlike traditional vinyl covers that can be cut with a knife. The BAKflip MX4 # BAK48121 will offer 21" of clearance inside of your bed and has a very sleek folding design that will allow you to fold the cover when you are using your fifth wheel hitch and...
    view full answer...
  • Will B&W Companion 5th Wheel Hitch Fit Under Tonneau Cover on 2018 Chevy Silverado 3500
    While we have not tested the B&W Companion 5th Wheel Trailer Hitch # BWRVK3400-5W and BAKFlip MX4 Hard Tonneau Cover # BAK48121 together on a short bed 2018 Chevy Silverado 3500, there are things we can look at to give you a good idea of compatibility. The first thing to note is that the Companion - which will be mounted on Custom Underbed Installation Kit # BWGNRK1016-5W - has three hitch height settings, with the lowest being 17 inches. We also know the BAKFlip MX4 will sit approximately...
    view full answer...
  • Ladder Rack Needed for 2015 Chevy Silverado 1500 6-1/2 Bed with BAKFlip MX4 Cover
    Since your BAKFlip MX4 Hard Tonneau Cover # BAK48121 sits inside the bed rails of your pickup we do have some solutions for you. The best option would be to use the Thule TracRac SR which is a sliding rack that mounts on top of your bed rails and has a weight capacity of 1,250 lbs. To fold your MX4 up you will simply need to move the legs out of the way along their tracks. For your Silverado you will need either part # TH43002XT-781 or part # TH43002XT-781EX if you want the over-the-cab...
    view full answer...
  • Recommended Ladder Rack That Does Not Interfere With Hard Tonneau Cover
    If your Undercover Hard Tonneau Cover sits inside of the bed rails you would be able to add the Thule TracRac SR Sliding Truck Bed Ladder Rack # TH43002XT-781 which sits on top of your bed rails and allows the ladder racks to slide around on the base rails for more a customizable fit for a 2015 Silverado with a standard 6 1/2' bed. You will need # TH43002XT-782 if you have a 2015 Silverado 1500 with a 5 1/2' bed. To be able to fold the cover you will need to slide the legs of the ladder...
    view full answer...
  • Would BakFlip Tonneau Cover from Ford F-150 Fit 2015 Chevy Silverado 1500 6.5 ft Bed
    Tonneau cover fits are very specific. It's rare that a cover fits the same truck for more than a few years as the designs tend to change pretty frequently which means that there basically wouldn't be any cover from a Ford F-150 that would fit a 2015 Chevy Silverado 6-1/2 foot bed. For a BakFlip tonneau that fits your truck you'd instead want the part # BAK48121 which is a confirmed fit.
    view full answer...
  • Will Tonneau Cover From 2011 GMC Sierra Fit a 2018 GMC Sierra
    After the 2013 model year, GM changed the bed dimensions enough so that the tonneau cover used on your 2011 GMC Sierra truck unfortunately wouldn't work for your 2018 Sierra. If you were interested in the BAK Revolver MX4 Hard Tonneau Cover that you'd looked at, you'd use # BAK79120 for the 5-1/2 foot bed, # BAK48121 for a 6-1/2 foot bed or # BAK79122 for an 8 foot bed. To see our entire selection of tonneau covers, use the provided link. On the page you're taken to, choose your...
    view full answer...




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Info for this part was:

Edited by:
Tyler C
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Video by:
Dustin K
Video by:
Shane H
Video by:
Jonathan Y
Video Edited:
Chris R
Video Edited:
Zach D
Test Fit:
Hayden R
Test Fit:
Jacob H
Updated by:
Sarah W
Updated by:
Noah M
Written by:
Ronnie R

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