BAKFlip MX4 Hard Folding Tonneau Cover for 2020-2026 Chevrolet Silverado / GMC Sierra 2500/3500 HD (8' Bed)

The 8' long bed on your 2020-2026 Silverado or Sierra 2500/3500 HD is built to haul, and the BAKFlip MX4 keeps that big load locked and dry. This is the direct, no-drill long-bed application for the heavy-duty trucks, clamping to the factory bed rails and folding flush to the cab so you never trade capacity for security. The heavy-duty aluminum panels take jobsite abuse and keep weather off your cargo year round.

What's Included:

• BAKFlip MX4 hard folding tonneau cover, pre-assembled
• Two clamp-on mounting rails
• Integrated tailgate seal
• Drain tubes
• Clamp and hardware kit
• BAKFlip hard-folding install guide

Features

The Original Hard-Folding Cover, Now Gen 3
The BAKFlip MX4 defined the hard-folding category and the Gen 3 keeps it at the top. Patented auto-latching, premium aluminum panels, and a low, flush profile give you a cover that looks factory and works like it was engineered for your truck, because it was.

Automatic Latching Security, Standard
The patented auto-latch system locks each panel down the instant you fold the cover closed, with no separate key or lever step. With the tailgate shut and locked, your gear sits under a cover that cannot be opened from outside.

Sealed Edge to Edge Against the Weather
Revised EPDM perimeter seals and tight-fit clamps close the gap between the cover and your bed rails, and a longer dual-action tailgate seal protects the back edge. Integrated drain tubes carry water off the cover and out through the bed. Like any folding cover it is water-resistant rather than submersible, but it keeps rain, dust, and spray off your cargo.

Built Stronger, Built to Last
Heavy-duty aluminum skins over a high-density polymer core make the Gen 3 panels about 22 percent stronger than the original MX4, with a textured matte finish that resists UV and scratches. This is multi-layer construction that will not bow or flex the way single-layer covers do under pressure.

100 Percent Bed Access, Brake Light Clear
Fold the panels flush against the cab, secure them, and drive with the bed fully open for tall or oversized loads, no removing the cover. The MX4 is the only hard fold that leaves your third brake light visible in every position.

One-Person Install in Under 30 Minutes
The all-new click-in design clamps to your factory bed rails with the included hardware, so most trucks install in under 30 minutes with basic hand tools, no drilling and no second person. Assembled in the USA and backed by a 5-year warranty with US-based product support.

MX4 Line-Up Comparison

How the BAKFlip MX4 (Gen 3) compares within its BAK family:

Fitment & Compatibility

Specifications

• Cover Type: Hard folding (tri-fold) tonneau cover
• Material: Heavy-duty aluminum panels over a high-density foam core; aluminum side rails
• Finish: Textured matte black
• Bed Access: 100%, folds flush against the cab
• Weight Capacity: 400 lb, evenly distributed
• Sealing: EPDM perimeter seals, integrated tailgate seal, drain-tube drainage
• Security: Automatic latching panels with reinforced latch housings
• Drilling Required: No, clamp-on install
• Install Time: About 30 minutes
• Fits: 8' bed, see fitment table
• Weight: About 79 lb
• Assembled In: USA
• Warranty: 5-year limited

Installation

Type: Clamp-on, no drilling  ·  Time: About 30 minutes (varies by truck)  ·  Tools: Basic hand tools, a socket or wrench set  ·  Difficulty: Easy, one-person DIY

The BAKFlip MX4 ships pre-assembled. Set it on the bed, clamp the mounting rails to your factory bed rails, connect the drain tubes where used, and check the tailgate seal. No cutting, trimming, or drilling into the truck. Follow the included BAKFlip hard-folding install guide for exact clamp placement and torque.

Watch the model-specific installation walkthrough:

Resources

Everything you need for your BAKFlip MX4 Hard Folding Tonneau Cover for 2020-2026 Chevrolet Silverado / GMC Sierra 2500/3500 HD, in one place.

• Official BAKFlip MX4 Hard Folding Tonneau Cover for 2020-2026 Chevrolet Silverado / GMC Sierra 2500/3500 HD installation guide (PDF), the manufacturer's step-by-step guide covering mounting, included hardware and adjustment.

Warranty, Shipping & Returns

Warranty. 5-Year Limited Warranty from BAK Industries against defects in materials and workmanship, backed by US-based product support. The warranty does not cover accident damage, neglect, or improper installation.

Free shipping. This item ships free to the lower 48 states. Because it is an oversized item, it ships by freight and typically arrives in 3 to 7 business days.

Inspect on delivery. Please inspect the packaging before signing. If you see any damage, note it on the delivery receipt and contact us right away, and we will make it right.

About BAK Industries

BAK Industries has engineered premium truck bed covers in the USA for decades and is a flagship tonneau brand of RealTruck, one of the largest truck-accessory manufacturers in North America. Its hard-folding BAKFlip and retractable Revolver lines set the benchmark for the category, pairing heavy-duty aluminum construction with a low-profile, weathertight design.

Every BAK cover is built for real-world truck use: no-drill, clamp-on installation that mounts in about 30 minutes, full bed access when folded or rolled back, and reinforced latching that keeps cargo secure and dry. The lineup runs from the value-focused BAKFlip MX4 and G2, to the flagship FRP-panel F1 and FiberMax, to the industrial Revolver X2 and X4s roll-ups, covering nearly every popular truck and bed length.

Backed by US-based product support and a multi-year manufacturer warranty, a BAK cover is a buy-it-once upgrade that protects tools, cargo, and gear while giving a truck a cleaner, more finished look.