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Secure lockable box used for securing valuable objects

A safe (also called a strongbox or coffer) is a secure lockable enclosure used for securing valuable objects against theft or fire. A safe is usually a hollow cuboid or cylinder, with one face being removable or hinged to form a door. The body and door may be cast from metal (such as steel) or formed out of plastic through blow molding. Bank teller safes typically are secured to the counter, have a slit opening for dropping valuables into the safe without opening it, and a time delay combination lock to foil thieves. One significant distinction between types of safes is whether the safe is secured to a wall or structure or if it can be moved around.

The first known safe dates back to the 13th century BC and was found in the tomb of Pharaoh Ramesses II. It was made of wood and consisted of a locking system resembling the modern pin tumbler lock. In the 16th century, blacksmiths in southern Germany, Austria, and France first forged cash boxes in sheet iron. These sheet iron money chests served as the models for mass produced cash boxes in the 19th century. In the 17th century, in northern Europe, iron safes were sometimes made in the shape of a barrel, with a padlock on top. In 1835, English inventors Charles and Jeremiah Chubb in Wolverhampton, England, received a patent for a burglar resisting safe and began a production of safes. The Chubb brothers had produced locks since 1818. Chubb Locks was an independent company until 2000 when it was sold to Assa Abloy. On November 2, 1886, inventor Henry Brown patented a "receptacle for storing and preserving papers". The container was fire retardant and accident resistant as it was made from forged metal. The box was able to be safely secured with a lock and key and also able to maintain organization by offering different slots to organize important papers.

For larger volumes of heat sensitive materials, a modular room sized vault is much more economical than purchasing and storing many fire rated safes. Typically these room sized vaults are utilized by corporations, government agencies and off site storage service firms. Fireproof vaults are rated up to Class 125 4 Hour for large data storage applications. These vaults utilize ceramic fiber, a high temperature industrial insulating material, as the core of their modular panel system. All components of the vault, not just the walls and roof panels, must be Class 125 rated to achieve that overall rating for the vault. This includes the door assembly (a double door is needed since there is no single Class 125 vault door available), cable penetrations, coolant line penetrations (for split HVAC systems), and air duct penetrations. There are also Class 150 applications (such as microfilm) and Class 350 vaults for protecting valuable paper documents. Like the data rated (Class 125) structures, these vault systems employ ceramic fiber insulation and components rated to meet or exceed the required level of protection. In recent years room sized Class 125 vaults have been installed to protect entire data centers. As data storage technologies migrate from tape based storage methods to hard drives, this trend is likely to continue.

A fire resistant safe is a type of safe that is designed to protect its contents from high temperatures or actual fire. Fire resistant safes are usually rated by the amount of time they can withstand the extreme temperatures a fire produces, while not exceeding a set internal temperature, e. g., less than Models are typically available between half hour and four hour durations. In the UK the BS EN 1047 standard is set aside for data and document safes to determine their ability to withstand prolonged intense heat and impact damage. Document safes are designed to maintain an internal temperature no greater than while in a constantly heated environment in excess of Data safes are designed to maintain an internal temperature no greater than while in a constantly heated environment in excess of These conditions are maintained for the duration of the test. This is usually at least 30 minutes but can extend to many hours depending on grade. Both kinds of safe are also tested for impact by dropping from a set height onto a solid surface and then tested for fire survivability once again. In the United States, both the writing of standards for fire resistance and the actual testing of safes is performed by Underwriters Laboratories. An in floor safe installed in a concrete floor is very resistant to fire. However, not all floor safes are watertight and will often fill with water from fire hoses, therefore everything stored inside should be placed in either double zip lock bags, dry bags, or sealed plastic containers. Reinforced, fireproof cabinets are also used for dangerous chemicals or flammable goods.

Wall safes are designed to provide hidden protection for documents and miscellaneous valuables. Adjustable depth allows the maximization of usable space when installed in different wall thicknesses. Some wall safes feature pry resistant recessed doors with concealed hinges for anti theft protection. A painting can be hung over a wall safe to obscure it from public view.

Safe cracking is opening a safe without a combination or key. There are many methods of safe cracking ranging from brute force methods to guessing the combination. The easiest method that can be used on many safes is "safe bouncing", which involves hitting the safe on top; this may cause the locking pin to budge, opening the safe.

Underwriters Laboratories (UL) testing certifications are known to be some of the most rigorous and most respected in the world. UL provides numerous ratings, the most common security and fire ratings as discussed below. UL ratings are the typical rating standards used for safes within the United States. They are only matched by B. T. U/VDMA certifications (Germany).

UL provides a variety of fire rating classifications, 125, 150, and 350 representing the maximum internal temperature in degrees Fahrenheit the safe may not exceed during the test. The classifications come in durations from 1/2 hour to 4 hours in length. The safe is exposed to gradually higher temperatures depending on the duration of the test. The most common standards being the 350 one hour (1,700 degrees) and 350 two hour (1,850 degrees) ratings as the temperature paper chars is approximately 451 degrees Fahrenheit.

UL standards are one of the principal protection standards considered by North American consumers when considering purchasing a safe. The time limit only includes "tools on the safe" time (measured with a stopwatch). The actual test might take hours to run and can be repeated as many times as the UL staff feels is necessary to ensure that all prospective avenues of attack have been thoroughly explored.

This is the entry level security rating offered by Underwriters Laboratories and it has its own standard: (UL 1037). The standard originally had one level, which is now known as RSC Level I. The standard was expanded in 2016 providing a greater range of security options. This standard also involves a drop test for products weighing 750 pounds or less. That aspect of the test simulates attempting to gain entry by forcibly dropping or knocking the safe to the ground. RSC Level I Must withstand a five minute attack by one technician using common hand tools such as drills, screwdrivers and hammers. RSC Level II Must withstand a ten minute attack by two technicians who use more aggressive tools such as picks, sledgehammers, pry bars, high speed carbide drills and pressure applying devices. In addition, the technicians will attempt to make a six square inch opening in the door or the front face of the gun safe. RSC Level III Similar to RSC Level II and gives two technicians a ten minute window to perform the test, but the range of tools become even more aggressive. Additionally, the size of the maximum attack opening shrinks significantly from six square inches to two square inches.

Safes at this level are typically, but not exclusively, used for commercial applications such as jewelers and coin dealers. These ratings are granted to combination locked safes that successfully resist when attacked by two technicians with common hand tools, picking tools, mechanical or portable electric tools, grinding points, carbide drills and pressure applying devices or mechanisms. In addition to those requirements, the safe must be at least 750 pounds or come with instructions for anchoring, have body walls of material equivalent to at least 1" open hearth steel with a minimum tensile strength of 50,000 P. S. I. The UL Standard for tool resistant safes and above are governed by UL Standard 687. TL 15 This is a combination locked safe that offers limited protection against combinations of common mechanical and electrical tools. The safe will resist abuse for 15 minutes from tools such as hand tools, picking tools, mechanical or electric tools, grinding points, carbide drills and devices that apply pressure. While the UL 687 defines this as a "limited degree" of protection that standard is used for commercial applications and the TL 15 rating still offers significant protection compared to unrated safes. TL 30 This safe offers moderate protection against combinations of mechanical and electrical tools. The safe will resist abuse for 30 minutes from the tools as in the TL 15 test but with the addition of more aggressive tools including: cutting wheels and power saws. TL 30x6 This is safe can withstand the same assaults as the TL 30 but protection is offered on all six sides of the body as opposed to only the door.

TRTL 30x6 This is a combination locked safe that offers high protection against combinations of mechanical, electrical, and cutting tools. The safe will resist abuse for 30 minutes from tools such as hand tools, picking tools, mechanical or electrical tools, grinding points, carbide drills, devices that apply pressure, cutting wheels, power saws, impact tools and, in addition, can withstand an oxy fuel welding and cutting torch (tested gas limited to combined total oxygen and fuel gas.) TRTL 60x6 This class will withstand the same assaults as Class TRTL 30x6 for 60 minutes.

TXTL 60x6 This class meets all the requirements for Class TRTL 60x6 and, in addition, can withstand high explosives such as nitroglycerin or equivalent to not more than of nitroglycerin in one charge (entire test must not use more explosive than that equivalent to of nitroglycerin).

Depending on the usage, the European Committee for Standardization has published different European standards for safes. Testing and certification according to these standards should be done by an accredited certification body, e. g. European Certification Body. EN 1143 1 is the main testing standard for safes, ATM safes, strongroom doors and strongrooms. For safes it features eleven resistance grades (0, I, II, , to X). From one grade to the next the security rises by approximately 50%. Testing is based on a free choice of attack tools and methods. Testing requires partial access (hand hole) and complete access attempts, on all sides of the product. The security is calculated by using ratings of tools and the attack time. The result is expressed in resistance units (RU). EN 14450 is a testing standard for secure cabinets and strongboxes. The standard covers products meant for purposes where the security resistance required is less than that of EN 1143–1. For fire resistant safes the EN 1047 1 (fire resistance standard similar to the fire resistance safe standard of UL) and EN 15659 (for light fire storage units) were published.