Profile details

Unfortunately these keyways are very difficult to catalog and I've probably missed several. Do contact me if you have any that are missing and know what they are named.

These illustrations are basically doodles, and are probably not to-scale. Do not take them as technical drawings.

Twin 6000

Profile	Image	Details
50		A keyway common on euro profile cylinders and other Twins sold in Europe. Identifiable by the upward-pointing spike at the bottom right.
51		The most common keyway. Identifiable by the center-pointing spike at the bottom right.
52		Identical to the 51 except the top section has been shifted towards the left. Most common on American formats such as kiks.
61		A, for some reason, extremely rare keyway. It is identical to the 50 except the top section has been shifted towards the left, similar to the 52. Thanks to Geo for finding me an image of one.
62		One of the most common keyways. Identifiable by the downward-pointing spike at the bottom right.

Twin Exclusive

AKA ASSA 6800 or ASSA E6000 (extension of Twin 6000)

(Not to be confused with the Baltic Twin Exclusive 5700)

Profile	Image	Details
851		Part of the 6800 series. A high-security variant of the Twin 6000 profile 51 as part of the Twin Exclusive range. 851 keys will enter the 51. Commonly found as an extra security step on systems using the 51. Easily identifiable by the steep undercut protecting the side pins. ASSA actually intended to produce 852 and 862 keyways to go alongside this one, but only the 851 was ever produced. The profile 851 is not stamped on keys, rather it is stamped as 'E'.
51		Identical to the Twin 6000 profile 51. Some ASSA catalogs group 51 as part of the Twin Exclusive profile family. Keys with this profile that were ordered as a Twin Exclusive key are also stamped 'E'.

Others

Starting with the Twin V-10, ASSA stopped producing these locks with varying keyway shapes and instead solely relied upon the varying sidebar bitting to provide exclusivity. All ASSA Twin locks series V-10 and newer use a standard keyway.

Series	Profile	Image	Details
Twin V-10 AKA ASSA 7000 or ASSA V6000	95		An extremely distinct keyway. It also typically has "ASSA V-10" stamped onto the face.
Twin Pro AKA ASSA 6100	0P4		Note the gray area on the right side of the keyway; this section is milled ~14.5 mm deep into the plug face (nowhere near all the way through). Its purpose is to accommodate the contact strip for ASSA Cliq keys so they may also operate non-Cliq cylinders.
Twin Maximum AKA ASSA 8800	0M7		Similar to the 0P4 in design, with a few extra pieces of warding; most noticeably along the left edge of the top of the keyway. May feature the cutout for Cliq keys.
Maximum+ AKA ASSA 9800	0A7		Very similar to the 0M7. In fact the only difference is the undercut tab protecting the side pins is slightly larger. 0A7 keys will enter the 0M7. May feature the cutout for Cliq keys.

Non-twins

A few other locks made by ASSA and ASSA Abloy-owned companies have been branded a "twin", but these locks do not use the same coded sidebar system as the main Twin series of locks. They are included here for identification.

Series	Profile	Image	Details
Twin Combi AKA ASSA 5800			The ASSA Twin Combi uses a system of rotating finger pins identical in function to the Schlage Primus. The bitting is encoded on the pins themselves in a typical slider-sidebar construction design. The Combi uses many profiles, but this one is by far the most common.
Twin Exclusive AKA ASSA 5700	0L6		Not to be confused with the ASSA Twin Exclusive 6800. This is a Baltic region exclusive lock. It uses a similar but different coded sidebar system to the main twin series, with 4 possible heights instead of 5.
Lockwood Twin	FT12		A lock sold under the Lockwood name in Australia after it was acquired by ASSA Abloy. The Lockwood Twin uses a keyway similar to the 6000 or Exclusive 6800. However, it only includes 3 side pins and the bitting is encoded onto the pins while the sidebar is standard. This lock is produced in many keyways typically stamped onto both the key and plug face. Shown is the FT12 keyway.