Servicing ASSA Twin Series Lock Cylinders

ASSA Twin Series lock mechanisms designed for single step master keying.


ASSA introduced the Twin 6000 High Security lock mechanism into the United States in 1984, offering a UL437 retrofit lock cylinder that provided patent protection against unauthorized key duplication. Since then, ASSA has continuously improved their patented lock mechanisms. The ASSA Twin series...


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ASSA introduced the Twin 6000 High Security lock mechanism into the United States in 1984, offering a UL437 retrofit lock cylinder that provided patent protection against unauthorized key duplication. Since then, ASSA has continuously improved their patented lock mechanisms. The ASSA Twin series lock mechanisms feature two independent locking technologies operated by one key. A standard nine depth, six space pin tumbler lock mechanism is operated by depths cut into the top of the key blade. The second consists of five side cut positions with five depths into the lower shelf portion of the left side of the key blade operates a coded sidebar.

The Twin 6000 series was made available using four programs that controlled the availability of key profiles by creating areas of exclusivity. Various sidebar codes are used to create different keyways.

The basic program provided local exclusive keyways for locksmiths. The next program level provided regional exclusive keyways for locksmiths. The third level provided national exclusive keyways for distributors. And the highest level provided regional and national exclusive keyways for end users, sold through normal distribution channels.

In 1996, ASSA introduced the patented Twin V-10 system, the next version of ASSA patented Twin Series lock mechanisms. The patent covers both the key and the lock cylinder. The Twin V-10 series was introduced as the next upgrade to the expiring patents of the ASSA Twin 6000 series. The patented features of the Twin V-10 include the under cut surface behind the side cut on the key blank, on a new key blank profile, and new side pins. Twin V-10 keys have "V-10" embossed into the bow.

The Twin 6000 and Twin V-10 components are not interchangeable.

In May 2000, ASSA introduced the Twin Exclusive. With V-10 patented features using the Twin 6000, 51 profile, it became the direct upgrade, offering Twin patented protection from unauthorized key duplication and backward compatibility to the Twin 6000 series. The Twin Exclusive improvements included milled undercut surface behind the side pin shelf and new broach opening of the lock cylinder plug. The Twin Exclusive keys can be identified by the undercut on the key along the inner surface of the blade.

The Twin 6000, Twin V-10, and Twin Exclusive were designed to be serviced by locksmiths.

In 2003, ASSA introduced the Twin Pro series, making the locks only available to ASSA end users and ASSA Certified Service Centers. The Twin Pro cylinders are not stocked through traditional distribution. The Twin Pro mechanical lock mechanism can interface with the ASSA Cliq system. The electronics-based Cliq offers key accountability with access control.

The ASSA Twin Series lock mechanisms are designed for single step master keying. The KIK/KIL, mortise and rim are equipped with six bottom pin sets that are manufactured of nickel silver. The longest bottom pin is a number #1 and the shortest pin is a #9. All of the pins are 0.114" in diameter. The design of the bottom pin is tapered to a flat that is 0.020" in diameter to provide a more reliable contact between the tumbler and the flat of the key cut. There are eight master pin lengths beginning with the shortest being #1 to the longest being #8.

ASSA Twin series lock cylinders use four graduated spooled top pins lettered A, B, C & D according to the operating pin stack.

Note: The KIK/KIL lock cylinders whose cylinder height is 1.020" require a modified pin stack by downsizing the top pins by one increment, according to the operating pin stack. The "A" top pin is downsized to a #5 master pin.

There are five side pins in every ASSA Twin Cylinder. There are five depths for each of the five side pin positions, providing in excess of 2,800 side codes. The side codes individualize the keyways. Each sidebar is reversible. Each sidebar is assigned two side codes that are obverse and reverse side codes. For example, a side code of 1-2-3-4-5 would have an obverse side code of 5-4-3-2-1.

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