"Is 'CONEX' the same as a shipping container?"

"Historically no. CONEX (CONtainer EXpress) was a US Army system that pre-dated the ISO standard and ran on its own footprint. Today the term is used loosely for any heavy-duty steel container - but the spirit of the word still applies to the toughest grades on the yard: Cargo Worthy and One-Trip units built to hammer through field abuse, not just sit on a chassis."

"Will it survive a Colorado winter at 9,000 feet?"

"Yes. Corten steel walls are unfazed by freeze-thaw cycles, and the unit weighs enough to ignore Front Range wind events up through 90 mph when properly chocked. We deliver to job sites in Leadville, Silverthorne, and the I-70 mountain corridor regularly."

"Can I cut a man-door or roll-up into a CONEX without ruining it?"

"Yes - done correctly. Cuts have to be reinforced with a welded steel tube frame to maintain the load path; otherwise you compromise the racking strength. Our delivery partners include welders who do this work in the field for an additional $400–$1,200 per opening."

"What's the difference between a CONEX and a job-box trailer?"

"A CONEX is a structural steel monocoque that you can stack, drag, and weld onto. A job-box trailer is a thin-skinned cargo body bolted to a frame, lighter but less secure and far less durable. For multi-year industrial sites, the CONEX wins on every count except mobility."

"Do you stock 10ft or 45ft CONEX units?"

"Not in standard inventory - they don't move enough volume in the Front Range. We can broker 10ft cut-down units and 45ft high cubes on a 2–3 week lead time. For most industrial applications a 20ft does the job."

"What does a One-Trip CONEX look like vs. a 10-year-old one?"

"One-Trip arrives factory-fresh: clean paint, square doors, dry floor, a single voyage of cosmetic dust. A 10-year-old cargo-worthy unit has paint dings, surface rust, and a working patina - but the steel underneath is identical and rated for another decade-plus of field service."

CONEX Containers in Aurora, Colorado - Aurora Used Shipping Containers

Construction superintendents, mine operators, and fabrication shops across Colorado need one thing from a storage box on site: it has to be there when they unlock it in the morning, no matter what the weather, the wildlife, or the night-shift opportunist did to it overnight. That’s the job CONEX was invented for, and that’s what we sell from the Aurora yard.

What CONEX really means

CONEX is shorthand for CONtainer EXpress - the original US Army logistics system from the Korean War that became the ancestor of the modern ISO shipping container. The Army needed boxes that could be dropped from a cargo plane, dragged behind a tractor, parked in a swamp, and still hold the contents intact. That design philosophy - overbuilt, modular, indifferent to abuse - is what people mean today when they call a container a “CONEX.”

The boxes we stock are not Korea-era surplus. They’re modern Corten-steel cargo containers in the toughest available grades: One-Trip for builders who want factory-new appearance, and Cargo Worthy for working sites where a few honest scars don’t matter. Both are stacking-rated, weld-ready, and built to a service life north of 25 years.

How a CONEX is built

Strip the paint off a CONEX-grade container and what you find:

14-gauge Corten weathering steel corrugated side walls, 1.6 mm thick, that form a self-passivating oxide layer instead of rusting through.
A welded steel underframe with cross-members on roughly 12-inch centers, sitting on four ISO twist-lock corner castings rated for 192,000 lb of stacked load.
A 1-1/8" marine-grade plywood or bamboo floor screwed to the cross-members and treated against pests per ISPM-15.
Forklift pockets under the 20ft footprint for tine handling on rough ground.
Cargo doors with four lock rods, neoprene gaskets, and stainless hinges.

The result is a box you can drop a Bobcat into, weld a man-door onto, stack three high in a row, and walk away from for a decade.

CONEX specs and grades

For industrial Front Range work we recommend two combinations:

Configuration	Best for	Price (Aurora yard)
20ft Standard, Cargo Worthy	General job-site lockup, fabrication shops, mine sites	$1,450
20ft Standard, One-Trip	Customer-facing sites, military, government, branded units	$2,800
40ft Standard, Cargo Worthy	Big-iron storage, lay-down yards, equipment storage	$2,100
40ft Standard, One-Trip	Modular office conversions, premium industrial	$3,800

Wind & Water Tight grades are available below those prices but we don’t usually recommend them for true CONEX-style use - once you start cutting, welding, and stacking, the older steel doesn’t return the same service life.

Front Range industrial use

The Aurora yard supplies CONEX boxes to projects up and down I-25 and out into the energy basins:

General contractors - secure tool storage on multi-month builds in Denver, Boulder, Castle Rock. Stacked two-high to save laydown footprint.
Mining and aggregates - replacement parts and blasting-supply storage at Front Range quarries and the Climax/Henderson moly operations.
Oil & gas - Weld County pads and Wattenberg field sites that need secure chemical and tooling lockup. We deliver to leased pads weekly.
DoD and federal - Buckley Space Force Base, Peterson, and adjacent government contractors who need One-Trip units for documented chain of custody.
Fabrication and machine shops - bolt-on overflow storage that doesn’t require a building permit in most Adams and Arapahoe County jurisdictions.

Siting on rough ground

A CONEX doesn’t need a foundation, but it does need four corners that share a plane. On a typical Front Range site we recommend:

Four pressure-treated 6×6 timber pads at the corner castings, leveled to within 1/2" across the diagonal.
Or four 18×18×4" concrete blocks for permanent installations.
A 6-inch crushed gravel base to keep the bottom dry through monsoon season and snowmelt.
Doors facing leeward - Front Range gusts will rip an unlocked door off its hinges if it catches a winter storm.

We can advise on site prep at delivery and our drivers will refuse to drop a unit that won’t sit square.

CONEX FAQ

The questions below come up on almost every industrial sale. If your project is in a sensitive jurisdiction (HOA, historic district, mountain town zoning), let us know up front - we’ve seen most of it before.

CONEX Containers in Aurora, Colorado