Lomax Hard Tri-Fold Pro 320 Tonneau Cover
Our Hard Tri-Fold Pro 320 gives you the security of a hard cover with the convenience of instant bed access. This low-profile tonneau cover sits flush with your truck bed rails, improving aerodynamics while protecting your cargo from weather and theft.
We built the 320 with aircraft-grade aluminum panels that fold completely open in seconds — no tools required. The matte black finish resists UV damage and complements any truck color. Whether you're hauling work equipment or weekend gear, the 320 adapts to your needs without compromising your truck's capability.
Installation takes under 30 minutes with our proprietary clamp system. The reinforced hinge design supports up to 400 pounds when closed, so you can load cargo on top when needed. We engineered every component to withstand extreme temperatures from -40°F to 160°F, making the 320 reliable in any climate.
What makes the 320 stand out
Aircraft-Grade Construction That Lasts
We manufacture the 320 using the same aerospace aluminum found in commercial aircraft components. Each panel undergoes a multi-stage powder coating process that bonds the matte black finish at a molecular level, preventing chips and fading even under constant UV exposure.
The reinforced piano hinge runs the full width of each fold, distributing stress evenly across the cover. We seal every hinge cavity with marine-grade grease to prevent corrosion in salt-air environments. The EPDM rubber gaskets compress against your bed rails to create a weathertight seal that keeps rain, snow, and dust out of your cargo area.
Aerodynamic Design for Better Fuel Economy
Low-Profile Engineering
The 320 sits just 1.5 inches above your bed rails when closed — our lowest profile in the Hard Tri-Fold lineup. This minimal height disrupts airflow less than traditional raised covers, reducing drag coefficient by up to 12% compared to driving with an open bed.
Wind tunnel testing showed the flush-mount design creates a smooth transition from cab to tailgate. Drivers report fuel economy improvements of 8-10% on highway trips after installing the 320. The streamlined shape also reduces wind noise and buffeting at speeds above 55 mph.
Complete Fold-Open Versatility
Unlike solid one-piece covers, the 320 folds completely against your cab in three quick motions. Each panel locks in the open position with spring-loaded latches, giving you unrestricted access to your entire bed when hauling tall items or loading from a forklift.
The tri-fold design lets you open just the rear section for quick access to tools or groceries without exposing your entire cargo area. Our fold configurations support one-third, two-thirds, or full bed access depending on what you’re loading.
Complete Your Truck Bed Protection
Rated 4.8 by verified buyers
Common Questions About the Hard Tri-Fold Pro 320
Yes, the Hard Tri-Fold Pro 320 works with all major spray-in and drop-in bed liners. Our adjustable clamps accommodate bed rail thickness variations up to 0.5 inches, which covers the added height from coating systems like Line-X or Rhino Liner.
The EPDM rubber seals compress to create a weathertight fit even on textured liner surfaces. We recommend checking that your liner doesn't cover the bed rail mounting surface where the clamps attach.
The Hard Tri-Fold Pro 320 supports up to 400 pounds of evenly distributed weight when fully closed and latched. The reinforced piano hinges and aircraft-grade aluminum panels create a rigid platform suitable for hauling equipment, camping gear, or building materials on top of the cover.
We don't recommend driving with cargo stacked on the cover due to aerodynamic concerns. Always secure loads on top with tie-down straps anchored to your truck's bed rail system rather than the cover itself.
Absolutely. The 320 uses our proprietary tool-free clamp system designed for DIY installation in under 30 minutes. You don't need any drilling, cutting, or permanent modifications to your truck bed.
We include detailed instructions with truck-specific diagrams. The clamps hand-tighten onto your bed rails and the pre-assembled panels drop into place. Most customers complete installation alone, though having a second person helps position the panels initially.
Independent testing shows the 320's low-profile design reduces aerodynamic drag by up to 12% compared to driving with an open bed. Most drivers report fuel economy improvements of 8-10% on highway trips.
Actual results depend on your truck model, driving speed, and wind conditions. The flush-mount design creates a smooth airflow transition from cab to tailgate, which reduces turbulence and improves efficiency at speeds above 45 mph.
The Hard Tri-Fold Pro 320 is our most popular tri-fold with a focus on low-profile aerodynamics and tool-free installation. The 360 adds integrated LED lighting and power locks. The 380 Stance features a brushed aluminum finish and upgraded security latches.
All our tri-fold covers use the same aircraft-grade aluminum construction and fold completely open for full bed access. The 320 offers the best value for drivers who want reliable protection without premium features.
The 320 uses a single rotary lock cylinder positioned near the tailgate for convenient access. When you turn the key, stainless steel latches engage strike plates on both bed rails simultaneously, securing all three panels.
The integrated design prevents pry attacks from either side of the bed. We include two keyed cylinders and four keys with every cover. The lock mechanism operates smoothly in temperatures from -40°F to 160°F without freezing or binding.
Yes, the tri-fold design gives you three access options. Open just the rear panel for quick access to about one-third of your bed — perfect for grabbing tools or groceries. Fold the rear two panels for access to two-thirds of the bed. Or fold all three panels completely against your cab for unrestricted full-bed access.
Each panel locks securely in the open position with spring-loaded latches. You can configure the cover based on what you're hauling without removing it from your truck.