ASSA TWIN 6000

ASSA TWIN 6000

The 6000 uses six pin-tumbler pins and five sidebar finger pins. To open the lock, all pin-tumblers must be aligned at the shear line and all finger pins must be properly aligned with the sidebar legs. Balanced pin stacks are used to resist attack from comb picks as well as reduces wear on the springs. Driver pins come in four sizes and use a modified spool design which is combined with counter-milling in the plug chambers to provide high pick resistance. There are nine depths for pin-tumblers, allowing for 531,441 (96) theoretical key differs for the pin-tumbler portion of the lock. The MACS for this lock is five depths, giving the 6000 around 160,000 real key differs. Master keying is available using traditional pin-tumbler master pins available in six sizes.
Unlike many other sidebar locks, the Twin 6000 finger pins are identical. Cuts are made on the sidebar directly and finger pins must be raised to match these positions. All finger pins use serrations above and below the true gate to provide manipulation resistance. Rekeying of the sidebar portion of the lock is only possibly when the sidebar is physically replaced or flipped upside-down. This interaction between finger pins and sidebar gates frustrates traditional decoding attacks that attempt to measure the range of movement of the finger pins. There are five depths available for finger pins, givin the Twin 3,125 theoretical sidebar differs (55). There are 2,800 real sidebar differs, using 1400 sidebars that can be flipped in either orientation. Keys are stamped with a five digit indirect sidebar bitting code.
To provide resistance against destructive entry, the 6000 uses hardened steel pins in the front of the plug and near the sidebar and third and fourth pin-stacks. In addition, driver pins are made of stainless steel to frustrate drilling of the pin stacks.

SCHLAGE PRIMUS CLASSIC

Schlage primus (classic)

The Primus (or Classic Primus) is a UL 437 rated pin-tumbler lock made by Schlage. It uses six pin-tumblers and a sidebar that requires finger pins to be raised and rotated properly. The Primus is functionally identical to the ASSA twin combi lock, but it does not include as many anti-lockpicking and key control mechanisms.
The Primus is an updated version of the Schlage Everest. The Schlage Everest Primus is an alternate version of the Primus that enhances key control capabilities
KEY SECURITY LEVELS
The Primus offers a variety of key security levels:
Level 1 - Commercially Exclusive
Distributors sell to end users via commercial locksmiths. All Level 1 keys have the same sidebar bitting code.[2]
Level 1+ - Wholesaler/Locksmith Exclusive
Locksmiths resell exclusive wholesaler sidebar bittings. Keys are stamped with unique locksmith ID numbers.
Level 2 - Contract Hardware Dealer Exclusive
Exclusivity limited to contract hardware dealers who sell directly to end users.
Level 3 - End User Exclusive
Exclusivity based on random assignment or the first 2 digits of a zip code.
Level 4 - End User Exclusive
Exclusivity based on time zone or nation.

CORBIN EMHART

Corbin Emhart

The Emhart is a pin-tumbler lock that uses six pin stacks. The driver pins of the Emhart have a T shaped protrusion, with a matching gap on the top of the key pins. These two points interlock, requiring that pins move together until they are disconnected. When pin stacks are properly raised and rotated, movement of the plug causes the pin stacks to disconnect, trapping each driver pin above the shear line. Driver pins maintain their position by being trapped in grooves around the plug. These grooves double as protection against various forms of destructive entry, as well. The key contains cuts that mirror the grooves in the plug, allowing the plug to rotate completely while keeping the driver pins in the proper position.
The tips of key pins are chiseled at various angles and mate with angled bitting cuts on the key. These cuts provide axial rotation which is necessary to properly rotate the pin stacks.
The Emhart uses a variable MACS based on the angle of rotation between pins. Adjacent pins with the same angles use a MACS of 4, adjacent pins with different angles use a MACS of 3.[2]

MEDECO BIAXIAL

Medeco Classic

The Medeco Biaxial uses five or six pin-tumblers that provide axial rotation to interface with a sidebar located at 3 o'clock. Pin-tumblers must be properly raised to the shear line as well as rotated so that the sidebar arms can fall into notches on the side of each pin-tumbler. Axial rotation is provided by the design of the bottom (key) pins and angled bitting cuts on the key. There are 6 depths available for pin-tumblers, allowing 7,776 (65) theoretical key differs in a five pin Biaxial (excluding the sidebar).
The main difference between the Biaxial and the Original is that Biaxial bottom pins sit before or after the center of the bitting cut. This allows for six total positions of the bottom pins, but pins use only three true gate positions. Biaxial pins have their own rotation codes:
Type Left Center Right
Fore (Biaxial) K B Q
Original L C R
Aft (Biaxial) M D S
There are 6 total positions for bottom pins, allowing 7,776 (65) and 46,656 (66) total sidebar differs in five and six pin Biaxials, respectively. True gates on the pins can only be rotated to three positions, so there are only 243 (35) and 729 (36) actual rotational differs in five and six pin Biaxials.
The Biaxial uses 2-3 mushroom top pins in each cylinder to provide manipulation resistance to traditional lockpicking. The sidebar notches on the sides of the bottom pins may also have false gates to resist manipulation by rotation.
In addition, "ARX" pins are used to protect against manipulation by rotation. ARX pins close the sidebar notches before they reach the end of the pin, making it so they cannot be grabbed by a grove grabber or another tool.
Resistance to forced entry is provided in the form of hardened steel rods and discs. In the plug rods are in the 3, 9, and 12 o'clock positions. In the cylinder, two crescent shaped discs are placed at the 12 and 3 o'clock positions to protect the pin-chambers and the sidebar. As a secondary locking mechanism, the sidebar itself also helps to protect against a variety of forced entry techniques. Bottom pins may also have a hardened steel core to resist drilling.