BiLock EX
BiLock NG
| BiLock NG | |
|
File:BiLockNG.jpg | |
| Name | BiLock NG |
|---|---|
| Manufacturer | BiLock |
| Lock Type | Cylinder |
| Lock Design | Pin-tumbler, Sidebar |
| Year(s) Produced | Mid 1980s-present[1] |
| Patent | US 6,681,609 |
| Related Locks | |
| [] | |
The BiLock EG (or BiLock New Generation) is a UL 437-rated pin-tumbler lock made by BiLock. All BiLock models include two rows of pins and an associated sidebar for each row. The key is U-shaped to simultaneously register both rows of pins. BiLock keys are first cut, then folded to create their classic U-shape.
Principles of operation
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ASSA literature numbers pins and key bitting positions from tip (back) to bow (front). Lockwiki uses the traditional terms and positions to avoid confusion. |
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.
The Twin 6000 sidebar.
Finger pins used with the sidebar.
Counter milling in the plug chambers.
Notes
- The pin-tumbler bitting code is referred to as the system code, and the sidebar bitting code as the sidebar code.
- Security pin design is based on a 1942 patent by Ralph Paul Crousore.[2][3]
Disassembly instructions
The 6000 is disassembled in the same way as a traditional pin-tumbler cylinder. The sidebar does not cause too many problems when the plug is removed. When the key is removed from the exposed plug the finger pins will be forced out by spring pressure.
- Remove the cam or C-clip.
- Insert the key and turn the plug 45-90 degrees.
- Withdraw the plug from the cylinder. (A plug follower is recommended)
OR
- Remove the chamber casings and take out each pin-stack individually
- Remove the cam or C-clip.
- Withdraw the plug from the cylinder.
Vulnerabilities
The 6000 system may be vulnerable to one or more of the following:
Notes
- Bumping is possible given a bump key with the correct sidebar bitting.
Gallery
Pins and springs used in the 6000 system.
Comparison of a "blank" and cut sidebar.
References
- ↑ BiLock: About Us
- ↑ US #2,283,489. Pin and Cylinder Lock.
- ↑ PULFORD, Graham (2007). High Security Mechanical Locks: An Encyclopedic Reference. ISBN 0750684372.
