BAK Revolver X4S Hard Roll-Up Tonneau Cover
Our Revolver X4S combines the strength of powder-coated aluminum slats with the convenience of a roll-up design. Unlike soft covers, this hard tonneau rolls forward smoothly while delivering full bed access in seconds.
We engineered the X4S for drivers who need quick cargo access without sacrificing security. The aluminum slat panels lock at the tailgate and resist denting, while the rolling mechanism stows the cover behind the cab when you need the entire bed open. Whether you’re hauling tools Monday through Friday or gear for weekend adventures, the X4S adapts to every load.
Aluminum slat & roll-up access
Aluminum slat construction
We build the X4S from extruded aluminum slats rather than vinyl or fabric because metal resists punctures, UV damage, and temperature extremes. Each slat receives a powder-coat finish that holds up under direct sun and road salt.
The slats interlock along their edges to form a continuous surface when the cover is closed. This design distributes weight evenly, so tools or equipment placed on top won’t create pressure points that warp softer materials. The matte black finish also hides fingerprints and minor scratches better than gloss coatings.
Roll-up access and storage
When you need the full bed, the X4S rolls forward on aluminum rails and secures behind the cab with an integrated storage canister. The rolling mechanism uses sealed bearings that keep dirt and moisture out, so the cover operates smoothly even after months of highway miles.
You can stop the cover at any point along the bed to create partial openings for tall cargo. The automatic latching system holds the cover in place wherever you stop rolling, which means you don’t need to fumble with straps or bungees to keep it open. When closed, the cover sits flat against the bed rails with less than an inch of clearance above the side panels.
Installation and fit
We designed the X4S with a clamp-on rail system that requires no drilling into your truck bed. The installation uses the existing stake pocket holes on most models, and you’ll tighten the clamps with basic hand tools in under an hour.
The side rails adjust fore and aft to account for minor variations in bed length, so the cover sits square even if your bed has a spray-in liner or drop-in mat. Once installed, the rails create a weatherproof seal using compression gaskets that flex to match the bed contour. We include detailed instructions with photos for every major truck model, and our team tests each fitment before we list it for sale.
More covers in the X4S family
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Common questions about the Revolver X4S
Yes, the X4S accommodates both spray-in and drop-in bed liners. The side rails include adjustable clamps that compensate for the added thickness, and the installation instructions include spacer options for liners that sit above the bed rail. We test fitment on trucks with popular liner brands before listing compatibility.
The low-profile design and aerodynamic slat shape reduce wind noise and drag compared to taller covers. The automatic latch keeps the cover secure at highway speeds, and the sealed bearings in the rolling mechanism prevent rattling. Many customers report improved fuel economy after installation, though results vary by truck model and driving habits.
No, you need to lower the tailgate before rolling the cover forward. The latch mechanism engages the tailgate lock, so the cover and tailgate operate as a single unit. This design ensures the cover stays locked when the tailgate is locked, which adds security but requires an extra step when accessing cargo.
We rate the X4S slats to support evenly distributed loads up to 300 pounds when the cover is fully closed and latched. That’s enough for a roof-top tent, a toolbox, or stacked lumber. Avoid point loads or impacts, since concentrated force can dent individual slats even if the total weight is under the limit.
We recommend rinsing the drain channels every few months to clear leaves and debris, and lubricating the roller bearings once a year with silicone spray. The powder-coat finish doesn’t need waxing, but you can clean it with car wash soap and a soft cloth. Check the clamp bolts for tightness after the first month of use, since they can settle slightly during break-in.
The X4S is compatible with most stake-pocket cargo racks and bed extenders as long as they don’t interfere with the side rails. Racks that mount behind the cab may prevent the cover from rolling fully forward, so check clearances before ordering. If you use a bed extender regularly, consider a folding cover instead of a roll-up design for easier compatibility.
We back the X4S with a three-year warranty against defects in materials and workmanship. The warranty covers the aluminum slats, rolling mechanism, rails, and hardware. It does not cover damage from accidents, improper installation, or modifications. If a component fails under normal use, we’ll replace it at no charge during the warranty period.