gun safe steel thickness chart

When it comes to true protection, the strength of your safe’s steel makes all the difference. Thicker steel means a tougher safe, one that’s much harder to cut, pry, or break into.

Sturdy Gun Safes are built from exceptionally thick, high-strength American steel. Our Heavy Duty Safe Line starts with .22" thick steel for the entire body, which is also what we refer to a 4 gauge. That’s nearly 1/4"! Far stronger than the thin sheet metal most safes use. This gives our safes serious weight and resistance you can feel. If you want even more muscle, you can upgrade your safe’s body thickness with our package options, turning it into an absolute tank.

Our safes also come with a solid steel door starting at 3/8" thick, which can be upgraded to over 1/2" thick with our steel package options. Behind that plate is a reinforcing 3/16" steel frame, for a total door depth of 3 inches, maximizing interior space while creating a door that’s unbendable.

We use only American-made A36 to Grade 50 steel. No cheap imports, no shortcuts.

Engineered for Maximum Protection

Built with integrity, reinforced for real-world protection.

gun safe weld

Most gun safes are made to look good, not to be truly tough. Because of this, many use weak “cold welds” or short, spaced-out welds that save time but don’t hold up under pressure.

At Sturdy Gun Safe, every seam is hot welded, meaning we fuse the steel together with intense heat for maximum strength and long-term durability. These deep, penetrating welds create a single, solid structure, not just pieces stuck together.

Our gun safe bodies are continuously welded. The only exception is where we attach the thick steel door plates to their inner frames. Because our welds run so hot, using continuous welds there would actually warp the steel, so we use carefully placed skip welds in that one area to keep our safe and vault doors perfectly flat and aligned, without losing strength.

gun safe door gap

Every Sturdy Gun Safe is engineered with deep door recesses and ultra-tight door gaps that completely block pry bars. There’s simply no room for a crowbar to fit. Few products on the market achieve this level of precision. On our fire-lined safe models, you can even feel and hear the airtight whoosh as the door seals shut, a sure sign of exceptional craftsmanship and uncompromising security.

Comparison of  gun safe 10 Bend Uni-Body Construction' and 'Sturdy 12 Bend Uni-Body Construction' on a white and black background.

Sturdy Gun Safes are built with a true uni-body design, crafted from a single sheet of steel bent twelve times for maximum strength. This eliminates weak vertical seams and splicing at the door seat, creating a cleaner, stronger body that naturally forms into its own reinforced door seat (aka Quadra-Formed Door Seat). Unlike the few competitors that use uni-body construction, Sturdy goes further with two additional bends at the door seat, adding rigidity and giving the locking bolts a stronger, more secure surface to bite into. Competitor safes often have deadbolts that rest on the thin edge of the steel, making them less secure and more prone to bending under force.

Sturdy Gun Safes are built with exposed hinges for practical advantages you won’t get with hidden hinges. The door can be removed to make moving the safe easier, and when in use, it swings a full 180° without risking hinge damage from being accidentally slammed open. Unlike hidden hinges, which are purely cosmetic, exposed hinges offer function without sacrificing security. Our safes use solid deadbolts to keep the door locked tight even if the hinges were removed.

steel for gun safes

We use only American-made A36 to Grade 50 steel. The result is a safe built for true security, where the thickness of the steel makes all the difference.

pike axe attack on gun safes

How Thick is Thick Enough?

Sturdy Gun Safe would never go thinner than a 3/16-inch steel body (7 gauge). Our customers understand this is the thickness needed to stop sledgehammers, pickaxes, and crowbars cold. By comparison, many safes on the market use thin metal walls (around 10 gauge or lighter) that can be split open with a pike axe in under a minute. Choosing thicker than 3/16-inch gives you even greater resistance and more time against high-powered tool attacks.
Gray metal gun safe with open door on a white background Gray gun safe with open door on a white background
Non Fire
Fire Lined

Door Shelving

Maximize your storage with built-in door shelves—perfect for keeping smaller valuables, documents, or accessories neatly organized and within easy reach. Designed for convenience without compromising security, just be sure to keep the deadbolt’s path clear. (Note: this feature is not available on fire-lined models.

10,000lb. Forklift Safe Pull Video