Safes & storage
Gun Safe Ratings Explained: How to Read Fire, Burglary, and Lock Claims
Gun safe spec sheets are full of impressive numbers: fire ratings in minutes and degrees, "military-grade" steel, dozens of locking bolts. Some of those numbers come from independent standards. Many don't.
This guide doesn't pick a brand. It explains what the common ratings and marketing terms actually mean, which ones are independently tested, and the questions to ask before you trust a claim.
Three categories people lump together
Lockboxes & cabinets
Thin steel, simple locks. They keep curious children and casual visitors out. They won't slow a determined thief with tools.
Residential security containers
What most retailers call "gun safes." Heavier steel, better locks, often a UL RSC label. Good for most homes when bolted down.
Rated high-security safes
Built and tested to resist skilled attack for a set time (TL ratings). Much heavier and more expensive. Common in commercial settings.
Knowing which category a product actually belongs to resets your expectations. A residential container is a significant obstacle for a hurried burglar. It is not a vault.
Burglary ratings: what's independently tested
| Label | Who sets it | What it means in plain terms |
|---|---|---|
| UL RSC (UL 1037) | UL Solutions | Residential Security Container. Passed a short attack test (about five minutes) by one person using common hand tools such as pry bars and hammers. |
| TL-15 / TL-30 (UL 687) | UL Solutions | Resisted an expert attack with power and mechanical tools for the stated net working time (15 or 30 minutes). Far beyond typical consumer gun safes. |
| California DOJ approved | California DOJ | Meets the state's firearm safety device or gun safe requirements. Useful baseline even outside California. |
| "Burglary rated," "security rated" | Often the manufacturer | Ask for the standard. Without one, these phrases don't tell you much. |
A UL RSC label is a reasonable minimum to look for in a full-size safe. Treat it as evidence the container isn't trivially pried open, not as a ranking between safes that all carry it.
Fire ratings: the most marketed, least standardized spec
Fire claims usually appear as "X minutes at Y degrees." The problem is that there's no single method behind those numbers across the industry.
Questions to ask about any fire rating
- Who did the test? An independent lab and a named standard are better than an in-house test.
- What was the internal temperature limit? A test is meaningful if it states how hot the inside was allowed to get. Paper chars well below typical fire temperatures; electronics and some media fail at lower temperatures.
- Was the temperature the furnace or the inside? "1,200 degrees" usually describes the outside heat, not the interior.
- Was there a fall or explosion test? Some standards include dropping the safe or a sudden heat test, which simulates floors collapsing in a house fire.
UL 72 is a recognized fire standard for record-protection safes, and those that carry it have clear class labels. Many gun safes are tested by other labs or methods instead, and some are not independently tested at all. That doesn't mean they're bad, only that you should compare by the details of the test, not by the biggest number on the sticker.
Look for an intumescent door seal, which expands under heat to block smoke and hot gas. Check that it's continuous around the door frame. Then remember: your safe's location matters. A basement corner or ground-floor exterior wall generally sees less fire than an upper floor.
Steel gauge and door construction
Steel thickness is expressed in gauge, where a lower number means thicker steel. Approximate thicknesses for common gauges:
| Gauge | Approx. thickness | Typical use |
|---|---|---|
| 16 | ~1.5 mm | Cabinets and lockers |
| 14 | ~1.9 mm | Entry-level safes |
| 12 | ~2.7 mm | Mid-range safes |
| 10 | ~3.4 mm | Heavier residential safes |
| 3/16" or 1/4" plate | ~4.8–6.4 mm | Premium bodies and door plates |
Thicker body steel resists prying and cutting better. Pay attention to the door too. Some manufacturers quote overall door thickness including fireboard and trim, which can make a thin steel plate sound substantial. Ask for the thickness of the steel plate itself.
Bolts, hinges, and the "bolt count" trap
Counting locking bolts is an easy marketing number. In practice, a few thick bolts in a well-built door and frame often beat many thin ones. What matters more:
- Bolt engagement depth into the frame
- Door and frame stiffness, which determines whether the door can be pried away
- Relocker mechanisms that lock the bolts if the lock is attacked
- Hardplate protecting the lock from drilling
External hinges are not a weakness on their own. Well-designed safes have bolts on the hinge side, so cutting hinges doesn't open the door.
Lock types and their ratings
| Lock type | Rating to look for | Pros | Cons |
|---|---|---|---|
| Mechanical dial | UL 768 Group 2 (or Group 1) | No batteries, long service life | Slower to open |
| Electronic keypad | UL 2058 | Fast, easy code changes | Batteries; keypad can fail |
| Biometric | Less standardized; check reviews and backup method | Fastest access when it works | Reads can fail with wet or dirty fingers |
| Key-only | Varies | Simple | Keys get found or copied |
Whatever lock you choose, ask what the backup access is. A keyed override is common. Its quality is part of the safe's security.
Marketing red flags
- "Military-grade" or "commercial-grade" with no standard named
- Fire minutes and degrees with no lab, no standard, and no interior temperature
- Gun capacity that assumes every slot is filled with a slim, unscoped long gun
- Overall door thickness quoted without steel plate thickness
- No mention of anchoring holes or hardware
Capacity numbers deserve their own warning. Many shoppers buy a safe rated for far more long guns than they own, only to find it full once optics, slings, and handguns go in. Plan for roughly half to two-thirds of the advertised capacity in real use.
Questions to ask before buying
- Which independent standards does this safe carry, and can I see the label?
- What is the steel plate thickness of the body and the door?
- What standard was the fire test done to, and what was the maximum interior temperature?
- What lock is installed, and is it rated?
- What is the backup access method if the lock fails?
- How is the safe anchored, and is hardware included?
- What does the warranty cover, including after a break-in or fire?
Anchoring is part of the rating
Burglary tests assume the safe stays put. An unanchored residential safe can be tipped over to get leverage on the door, or moved out entirely. Bolt it to the floor following the manufacturer's instructions. For concrete, use the specified anchors. For wood floors, aim for the joists.
FAQ
What does UL RSC mean on a gun safe?
It stands for Residential Security Container under UL 1037. The safe passed a short attack test by one person using common hand tools. It's a reasonable minimum for a home safe, not a high-security rating.
Is a 60-minute fire rating better than a 30-minute rating?
Only if the tests are comparable. Ask who tested it, to what standard, and the maximum internal temperature. A well-documented shorter rating can be more trustworthy than an unverified longer one.
Does more locking bolts mean a stronger safe?
Not necessarily. Bolt thickness, engagement depth, frame stiffness, and relockers matter more than how many bolts are visible.
What steel gauge should a gun safe be?
Lower gauge means thicker steel. For a full-size safe, many buyers look for 12 gauge or thicker. Also check the door's steel plate thickness, not just its overall thickness.
Do I need to bolt down my gun safe?
Yes. Burglary resistance assumes the safe can't be tipped or carried away. Anchor it according to the manufacturer's instructions.
Bottom line
Read a safe's spec sheet the way you'd read a car ad: trust standards, verify numbers, ignore adjectives. For most homes, a UL RSC-labeled container with a rated lock, thick steel, a good door seal, realistic capacity, and solid anchoring is a smart buy. Spend your extra money on steel and construction before you spend it on bigger fire numbers you can't verify.