Medeco M4: Difference between revisions

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{{Lock model
{{Lock model
|name = Medeco M4
|name = Medeco M4
|Img = File:Medeco_M4_components-Septclues.png
|Img = File:Medeco_M4_cylinder-Septclues.jpg
|maker = [[Medeco]]
|maker = [[Medeco]]
|lock_type = [[Cylinder]]
|lock_type = [[Cylinder]]
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The M4 sidebar differs from previous models because it has small grooves cut out where the side pins fit into.  Once side pins are properly lifted by the correct side bitting and shuttle pin on the key, and pin tumblers are properly rotated by the correct key, the sidebar legs can interface with the gates on each pin-tumbler.                       
The M4 sidebar differs from previous models because it has small grooves cut out where the side pins fit into.  Once side pins are properly lifted by the correct side bitting and shuttle pin on the key, and pin tumblers are properly rotated by the correct key, the sidebar legs can interface with the gates on each pin-tumbler.                       


The M4 side pins are spring-biased components located to the left of the sidebar. In their default state, the side pins block the sidebar from retracting. A moveable element on the right side of the key lifts the single Lift Pin into the correct position.  Side milling on the key moves the three Finger Pins into the correct position.  There are three different Finger Pins, with true gates at different heights, and false gates.
The M4 side pins are spring-biased components located to the left of the sidebar. In their default state, the side pins block the sidebar from retracting. A moveable element on the right side of the key lifts the single Lift Pin into the correct position.  Side milling on the key moves the three standard side pins into the correct position.  There are three different standard side pins, with true gates at different heights, and false gates.


<div align="center"><gallery>
<div align="center"><gallery>
 
File:Medeco_M4_key_pin-Septclues.jpg |An M4 key pin.
File:Medeco M4 side pins-Septclues.jpg |Side pins from an M4 cylinder.
File:Medeco M4 lift pin-Septclues.jpg |A Lift Pin from an M4 cylinder.
File:Medeco_M4_sidebar_side_view-Septclues.jpg |M4 sidebar.
File:Medeco_M4_sidebar-Septclues.jpg |M4 sidebar.
</gallery></div>
</gallery></div>


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<div align="center"><gallery>
<div align="center"><gallery>
File:Medeco_M4_sidebar_side_view-Septclues.jpg
File:Medeco_M4_plug_rear_view-Septclues.jpg |M4 plug.
File:Medeco_M4_sidebar-Septclues.jpg
File:Medeco_M4_plug_front_view-Septclues.jpg
File:Medeco_M4_plug_rear_view-Septclues.jpg
File:Medeco_M4_plug_bottom_view-Septclues.jpg
File:Medeco_M4_plug_side_view-Septclues.jpg
File:Medeco_M4_components-Septclues.png |Components of an M4 cylinder.
</gallery></div>
</gallery></div>


== References ==
== References ==
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* [[Axial rotation]]
* [[Axial rotation]]


{{Stub}}
 


[[Category:Lock models]]
[[Category:Lock models]]
[[Category:Medeco]]
[[Category:Axial rotation]]
[[Category:Axial rotation]]
[[Category:Medeco]]
[[Category:Pin-tumbler locks]]
[[Category:Pin-tumbler locks]]
[[Category:Sidebar locks]]
[[Category:Sidebar locks]]
[[Category:Movable element keys]]
[[Category:UL 437 locks]]
[[Category:UL 437 locks]]

Latest revision as of 09:03, 3 January 2023

Medeco M4

Medeco M4
Medeco M4 cylinder-Septclues.jpg
Name Medeco M4
Manufacturer Medeco
Lock Type Cylinder
Lock Design Pin-tumbler, Sidebar
Year(s) Produced 2021 - Present
Patent Expires 2040
Related Locks
Medeco Original
Medeco Biaxial
Medeco Bilevel
Medeco M3


The M4 (or M4) is a UL 437-rated pin-tumbler lock made by Medeco. The pin tumblers use axial rotation to interface with a sidebar located at 3 o'clock in the plug. It also features four spring biased side pins that restrict movement of the sidebar until properly positioned. One of the side pins is lifted by the Shuttle Pin movable element in the key. The M4 is easily identified by the "M4" logo to the left of the keyway.

It is called the M4 because it is the forth generation of Medeco's axial rotation system, following the Medeco Original, Medeco Biaxial, and Medeco M3 designs.

Principles of operation

See also Medeco Biaxial (Principles of operation)

The M4 uses five or six pin-tumblers that provide axial rotation to interface with a sidebar. It uses standard, mushroom, and barrel drivers.

The M4 sidebar differs from previous models because it has small grooves cut out where the side pins fit into. Once side pins are properly lifted by the correct side bitting and shuttle pin on the key, and pin tumblers are properly rotated by the correct key, the sidebar legs can interface with the gates on each pin-tumbler.

The M4 side pins are spring-biased components located to the left of the sidebar. In their default state, the side pins block the sidebar from retracting. A moveable element on the right side of the key lifts the single Lift Pin into the correct position. Side milling on the key moves the three standard side pins into the correct position. There are three different standard side pins, with true gates at different heights, and false gates.

Notes

  • Original, Biaxial, and M3 sidebars are not compatible with the M4.


Disassembly instructions

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Vulnerabilities

The M4 is thought to be an improvement to the M3, allowing for enhanced key control and pick resistance. Research by the locksport community has shown a picking attack is possible.


Gallery

References


See also