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For the surname, see Schlage (surname).
A key cut on a generic key blank compatible with a 5-pin C keyway (EZ# SC1 or Axxess+# 68), a common residential keyway.
Schlage Everest C123, patented key blanks
Schlage Primus design

Schlage (pronounced /ˈʃlɡ/ SHLAYG[1]) is a lock manufacturer founded in 1920 by Walter Schlage in San Francisco. Schlage also produces high-security key and cylinder lines, Primus, Everest and Everest Primus XP. Schlage is one of the most popular brands of consumer and commercial locks in the United States.[2]


The company was acquired by Ingersoll Rand in 1974, and remained an Ingersoll Rand subsidiary for nearly 30 years. Schlage is currently a subsidiary of Allegion, an Ingersoll Rand spin-off formed in December of 2013.[3]

In May 2009, demolition began on the San Francisco headquarters of Schlage; though the original 1926 Spanish Colonial, designed by local architect William Peyton Day will remain, the rest of the Schlage headquarters is planned to become affordable, green housing.[4][5]

Keyway types[edit]

Like many lock manufacturers, Schlage uses milled complex keyway shapes to mechanically prevent some non-OEM keys from entering or operating a lock. New keyway designs may be protected for a limited time by patent protection, which expires after a set number of years.

There is no law against duplicating the reverse, numbered or quad-key blanks, which are not patented and are not protected against third-party manufacturing.[6]

As of 2008, Primus keys are no longer protected by patents; therefore, anyone is free to duplicate them. The Everest patents expired in 2014.[7]

Primus/Primus XP[edit]

In addition to six cuts for standard locking mechanism, there are five side finger pins to operate the secondary sidebar lock. Primus keys will operate non-Primus locks within the same system. Primus blanks and keyways are slightly thinner to prevent the entry of non-Primus keys; however, even if a standard key is altered to allow entry, it will not operate Primus locks. This design was protected until 2007 under US Patent #4,756,177. The current generation Primus, called the Primus XP, is a slight modification to the original design and is protected until 2024 under US Patent #7,159,424. Schlage did not invent, nor do they hold the patents on, Primus or Primus XP. The design is licensed to Schlage by Bo Widen of Torshälla, Sweden, the inventor and patent holder.


This design features a patented under groove in the keyway design, and was legally protected against cloning by utility patents until 2014. Relevant patents are: US Patent #5,715,717 (December 2, 2016) and US Patent #5,809,816. Just like the classic series, Everest Primus keys can operate Everest non-Primus locks, but not the other way around. Everest Primus XP is an extension to Primus Everest and the XP design is protected until 2024 under US Patent #7,159,424. Schlage did not invent, nor do they hold the patents on, the Everest keys, which were designed and patented by Bo Widen and licensed to Schlage.


There are seven different keyways: C, CE, E, EF, F, FG, and G. There is also a special P keyway designed to accept any of the seven sectional keys and a special L key blank (35-101 L) designed to be accepted into all seven keyways. OEM L section blanks are made of stainless steel.[8]

The older type, the common residential keyway, is known as 35-100C, which is a five-pin, C section.

Reverse (restricted)[edit]

This variation was a horizontal mirror image of obverse keyways, no longer offered in new key system, and not available with a Primus option.

Numbered or Paracentric (restricted)[edit]

This is a large family of keyways expressed as four numbers. Except for zeros, digits in the keyway designation cannot repeat; i.e. 3578, 1358 and 1200 are valid, but 1244 and 3300 are not. Primus cannot be implemented on this series. The digit 9 is not used. Each digit represents the presence of a notch in the keyway and a corresponding protrusion along the blade of the key. The odd digits 1, 3, 5, and 7 extend along the left side of the keyway as observed from the lock face from bottom to top. The even digits are likewise, on the right side. Generally, keyways are identified by four non-zero digits in ascending order. In a large masterkey system, keys with fewer than four protrusions can be used to enter more than one keyway. For example, key blank 1460 will fit lock cylinder 1246, 1346, 1467, etc.

Quad (restricted)[edit]

Expressed in four characters, such as WSTP, VTQP, etc. This is a very large family, available in Primus.

Key copying[edit]

At the 2013 DEF CON conference, MIT students David Lawrence and Eric Van Albert released a piece of code that allows anyone to create a 3D-printable software model of any Primus key. With just a flatbed scanner and their software tool, they were able to produce precise models that they uploaded to the 3D-printing services Shapeways and i.Materialise, who mailed them working copies of the keys in materials ranging from nylon to titanium.[9]

Nexia Home Intelligence[edit]

Nexia Home Intelligence is a home automation system offered by Schlage that allows users to remotely control and monitor home automation devices. A wireless network is created within the home and connects the wireless door lock to the internet. Using a smart-phone or a web-enabled computer, users can monitor and send commands to the Schlage Bridge, which communicates with Z-Wave enabled wireless locks, thermostats, lights, cameras, and other components within the home.

There is a monthly fee associated with the Nexia Home Intelligence service.

Nexia Home Intelligence is no longer maintained by Schlage. It remained with Ingersoll Rand during the IR-Allegion spin off process. Ingersoll Rand solely maintains the Nexia platform. All Schlage products that were designed for the Nexia platform work with major smart home platforms.


External links[edit]