LOMAX Professional Hard Tri-Fold Tonneau Cover for 2019-2026 Chevrolet Silverado 1500 / GMC Sierra 1500 (6'7" Bed)
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Features
- Extra Channels, 500 lb Rated: Additional extruded aluminum channels run under each panel, so the closed Professional Series holds up to 500 lb spread evenly, 100 lb more than the standard Hard Tri-Fold. Spread heavy loads rather than resting them on one point.
- Black Diamond Mist Panels: The aluminum panels wear a tough black diamond-plate urethane finish that LOMAX calls Black Diamond Mist. It is the only finish this line is offered in.
- One Pull Frees Both Latches: The Automatic Dual Locking System opens both latches with one tug on the release cord, which you can reach from either side. Unfold the panels and the cover locks itself at ten points; heavy-duty nylon latches meet the rails with 1/2" of engagement.
- Water-Shedding Hinges, No Drains: Reinforced vinyl-coated hinges, a continuous seal down each side rail and a water-shedding shape turn rain away, with no gutters or drain tubes. LOMAX calls the design water-shedding, and its manual says no cover keeps out all moisture and dust.
- Folds Forward, Lifts Off: Fold the panels toward the cab and retractable storage clips hold the stack on vinyl-capped standoffs. The LOMAX manual also shows how to slide the whole cover back off its hooks and lift it away for the full bed.
- No-Drill Clamps, Low Line: Eight TIGHT BITE clamps hold the rails with no drilling on most trucks, and the closed cover sits less than 1/2" above the box. A few trucks use a LOMAX special sheet, listed under Installation.
Description & Fitment
This LOMAX Professional hard tri-fold tonneau cover fits the 6'7" bed on 2019-2026 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks, with or without a Multi-Flex or MultiPro tailgate. It is not for CarbonPro beds or Bed Side Storage Boxes. Channel-reinforced Black Diamond Mist panels take 500 lb of evenly spread cargo, and one pull frees both latches. The cover folds forward or lifts off, with water-shedding hinges and no-drill clamps.
Fitment & Compatibility
| Years | Model | Bed | Notes |
|---|---|---|---|
| 2019-2026 | Silverado 1500 | 6'7" | with or without Multi-Flex/MultiPro tailgate; not for trucks with CarbonPro boxes or Bed Side Storage Boxes |
| Years | Model | Bed | Notes |
|---|---|---|---|
| 2019-2026 | Sierra 1500 | 6'7" | with or without Multi-Flex/MultiPro tailgate; not for trucks with CarbonPro boxes or Bed Side Storage Boxes |
Check your bed: Measure inside the bed floor from the bulkhead to the closed tailgate. This part is for the 6'7" box.
Not for: trucks with Bed Side Storage Boxes, the 2019-2026 Silverado / Sierra 1500 5'10" box (B0020079), or the 2019-2026 Sierra 1500 CarbonPro 5'10" box (B0020109). Same bed, other LOMAX lines: the Hard Tri-Fold (B3020089 Urethane Aluminum, B4020089 Urethane Diamond Plate) and the STANCE (G3020089 Urethane Aluminum); the Hard Tri-Fold and STANCE are rated 400 lb, and the STANCE stands upright behind the cab.
About LOMAX
LOMAX hard folding covers come from Agri-Cover, Inc. of Jamestown, North Dakota, the same company behind ACCESS roll-up covers. Agri-Cover offers three LOMAX lines: the Hard Tri-Fold (400 lb rating, four urethane finishes), the Professional Series (extra aluminum channels for a 500 lb rating, diamond plate only) and the STANCE, which stands upright behind the cab. All three clamp on with TIGHT BITE clamps on most trucks and carry Agri-Cover's 3-year limited warranty.
The Professional Series is the heavy-duty LOMAX line: the same three-panel fold, latching and clamps as the Hard Tri-Fold, with extra channels for a 500 lb rating and a Black Diamond Mist finish.
Authorized LOMAX dealer. We sell LOMAX covers as an authorized dealer, and your Professional Series cover carries Agri-Cover's 3-year limited warranty.
Frequently Asked Questions
Will this fit my 2019-2026 Silverado / Sierra 1500?
Yes, if it has the 6'7" box; not for CarbonPro boxes or Bed Side Storage Boxes. Measure inside the bed floor from the bulkhead to the closed tailgate and match it to the label. If you're unsure, send us your VIN and we'll check.
Does it fit the 5'10" short box?
No. The 5'10" box takes B0020079, or B0020109 for the GMC CarbonPro box. This part is for the 6'7" standard box only. If you're unsure, send us your VIN and we'll check.
How is it different from the Hard Tri-Fold?
The Professional Series adds extruded aluminum channels under each panel, which lifts the rating from 400 lb to 500 lb and the weight to about 60 lb. It comes in one finish, Black Diamond Mist diamond plate. Latches, ten-point locking, clamps and the low profile are the same.
Is it waterproof?
LOMAX calls the design water-shedding. Vinyl-coated hinges and a continuous seal down each side rail keep most rain and snow out, but the LOMAX manual says no cover stops all moisture and dust, so keep anything that must stay dry in a closed container.
Do I have to drill my truck?
Not on most trucks. TIGHT BITE clamps hold the side rails, and a few beds use a LOMAX special sheet with bolt-on brackets, still without drilling. The exception is the GM CarbonPro box, whose sheet adds a 1/4" hole drilled through the bed cap at each bolt location.
What does the 500 lb rating mean?
It is the weight the closed cover supports when the load is spread evenly across the panels. LOMAX's manual also says never to stand, sit or ride on the cover, and to keep objects off it.
Installation
- 1/2" wrench
- Torque wrench (ft-lb) with a 1/2" socket
- Scissors
- Eye protection
- Long-box rails also need a 7/16" wrench
Here's the short version. The Professional Series uses the same LOMAX manuals as the Hard Tri-Fold; follow the one for your box length (below), plus any special sheet your truck needs.
- Set the side rails. On long boxes, first join each pair of rail sections at the pre-installed assembly bracket with the supplied carriage bolt and nut, leaving little to no gap. Set each rail with its weather strip against the inside lip of the box, the front catch toward the cab and the rail guide resting on top of the box, then push it forward until it touches the front of the box.
- Clamp each rail level. Have a helper or a spring clamp hold the rail. Fit the first clamp as close to the front as you can, snug it with a 1/2" wrench and make sure the teeth sit in the rail grooves, then raise or lower the clamp until the rail is level. Add the remaining clamps toward the tailgate, repeat on the other side and torque every clamp to 20 ft-lb, or the figure on your truck's special sheet.
- Seal the front of the box. Wipe the top of the bulkhead clean. Lift the bed cap at each front corner and press a generous bead of the black sealant into the gap between bulkhead and bed cap.
- Fit the front seal. With air and surface above 60Β°F, peel the backing as you go and stick the front seal along the front of the rails and the inside edge of the box, tall side facing the cab. Cut it to length and press it down firmly.
- Hook the cover on. Lift the folded cover onto the front of the rails, hold its rear edge 1" above them and slide the cover hooks under the front catches on both sides. Lower it so the latches drop into the retainment brackets, then clip both safety straps to their brackets.
- Unfold and leave it closed. Unhook the storage clips, unfold the middle panel and then the rear panel toward the tailgate, and check that every hook and latch is fully engaged. LOMAX asks you to leave the cover closed for at least 48 hours so it can settle to the box.
Stuck on a step?
- Pre-folded cover assembly
- Driver and passenger side rails (two-piece rails on standard boxes, typically 6' or longer)
- (8) TIGHT BITE clamps
- Front seal
- Black sealant
Specifications
| Brand | LOMAX (Agri-Cover, Inc.) |
|---|---|
| Part Number | LOMB0020089 |
| Cover Type | Hard tri-fold, three panels, heavy duty |
| Finish | Urethane Diamond Plate (Black Diamond Mist) |
| Panels | Aluminum with extra extruded aluminum channels under each panel |
| Load Rating | Up to 500 lb, evenly distributed |
| Cover Weight | About 60 lb |
| Profile | Less than 1/2" above the box |
| Latch | Automatic Dual Locking System, pull cord from either side, nylon latches with 1/2" engagement |
| Locking | Automatic ten-point locking as the panels unfold |
| Weather Management | Water-shedding design, reinforced vinyl-coated hinges, continuous side-rail seal, no drains |
| Folded Storage | Retractable storage clips, vinyl-capped standoffs |
| Mounting | 8 TIGHT BITE clamps, no drilling on most trucks |
| Manufacturer | Agri-Cover, Inc., Jamestown, North Dakota |
| Bed Length | 6'6" box (GM's name), measured 6'7" (79.4") |
| UPC | 813072025334 |
More media
2 videosWarranty, shipping & returns
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Warranty
Agri-Cover, Inc., the maker of LOMAX covers, gives the LOMAX Professional Series a 3-year limited warranty: it is warranted free from defects in workmanship under normal use on the truck model it was made for.- The 3 years run from the date you received the cover or its date of manufacture.
- Agri-Cover repairs or replaces defective parts, at its option. No labor or service allowance is included, and incidental or consequential damages are not covered.
- Not covered: ordinary wear and tear, or damage from an accident, abuse, misuse, alteration, neglect or improper installation.
- For claims and registration help, contact us at support@prestigetruck.com with your order number and the cover's serial number (on a decal under the rear panel, driver side). We handle the claim with Agri-Cover.
- If Agri-Cover needs the cover back for inspection, it issues a return authorization (RA) number first; the cover ships to Agri-Cover freight prepaid, and Agri-Cover pays the freight to send it back.
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Free shipping
Ships free to the lower 48 states, with no minimum order.- Order by 5 PM ET on a business day and it starts processing the same day.
- The pre-folded cover ships in one large carton, by freight or oversized parcel carrier depending on its size.
- Most orders arrive within 1-5 business days.
- We email your tracking number as soon as it ships.
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Inspect on delivery
This hard folding cover ships pre-folded in one large carton; check the parts against the list on page 2 of the LOMAX manual before you start. Check it as soon as it arrives.- Look for crushed ends, punctures or tears in the carton.
- If something looks wrong, take photos of the box and the parts (and if a driver asks you to sign, note the damage on the receipt).
- Open the box and check the parts against the parts list before you install.
- Email support@prestigetruck.com right away with your order number, a short note and photos. We send a replacement or a full refund at no cost to you.
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30-day returns
Return it within 30 days of delivery, unused, in the original packaging, with proof of purchase.- Email support@prestigetruck.com with your order number. We reply within 1-2 business days with instructions.
- Damaged, defective or wrong item: we send a prepaid label or arrange a pickup.
- Changed your mind: you pay return shipping. No restocking fee.
- Refunds go back to your original payment method within 7 business days of approval. See our returns policy.