Master Lock No 4: Difference between revisions

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= Master Lock No. 4 =
<span style="font-size: 188%; line-height:190%">{{PAGENAME}}</span>
----


{{Lock model
{{Lock model
| name = Master Lock No. 4
| name = Master Lock No. 4
| Img = File:MasterNo4.jpeg
| Img = File:Master Lock No 4 front - FXE48772.png
| Img_size = 150px
| Img_size = 200px
| maker = [[Master Lock]]
| maker = [[Master Lock]]
| lock_type = [[Padlock]], [[Cylinder]]
| lock_type = [[Padlock]], [[Cylinder]]
| lock_design = [[Pin-tumbler]]
| lock_design = [[Pin_tumbler|Pin-tumbler]]
| years_produced =  
| years_produced =  
| patent =  
| patent =  
| related =  
| related =  
| spec_on      = true
| spec_comptype = [[Pin_tumbler|Pin-tumbler]]
| spec_comp    = 4
}}
}}


The '''No. 4''' is a [[pin-tumbler]] [[padlock]] made by [[Master Lock]]. The No. 4 uses a laminated brass padlock body with an internal key-in-knob-style [[cylinder]]. The inner cylinder uses four pin stacks and does not use any [[security pin]]s.
The '''No. 4''' is a [[Pin_tumbler|pin-tumbler]] [[padlock]] made by [[Master Lock]]. The No. 4 uses a laminated brass padlock body with an internal key-in-knob-style [[cylinder]]. The inner cylinder uses four pin stacks and does not use any [[security pin]]s.


The No. 4 is a common low security padlock used in the United States.
The No. 4 is a common low security padlock used in the United States. It is one of a line of laminated brass padlocks that includes the [[Master Lock No 2|Master Lock #2]], [[Master Lock No 4|#4]], [[Master Lock No 6|#6]], and [[Master Lock No 8|#8]].


__TOC__
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== Principles of operation ==
== Principles of operation ==


The No. 4 cylinder is a [[pin-tumbler]] lock with four pin stacks and no [[security pin]]s. The cylinder typically uses the [[M1]] [[Key#Types_of_Keys|key profile]] but may use other profiles, as well. The standard No. 4 can be opened in both directions but the "commercial" series body restricts opening to clockwise rotation. The No. 4 is not a [[key retaining]] padlock.
The No. 4 cylinder is a [[Pin_tumbler|pin-tumbler]] lock with four pin stacks and no [[security pin]]s. The cylinder typically uses the [[M1]] [[Key#Types_of_Keys|key profile]] but may use other profiles, as well. The standard No. 4 can be opened in both directions but the "commercial" series body restricts opening to clockwise rotation. The No. 4 is not a [[key retaining]] padlock.


== Disassembly instructions ==
== Disassembly instructions ==
Line 46: Line 50:


== Gallery ==
== Gallery ==
 
<div align="center"><gallery align="center">
 
File:Master Lock No 4 front - FXE48772.png | Front
File:Master Lock No 4 keyway - FXE48774.png | Keyway
File:Master Lock No 4 key - FXE48747.png | Key
File:Master Lock No 2-8 grid - FXE48731-Edit.png | ML #2, #4, #6, and #8.
</gallery></div>


== See also ==
== See also ==


* [[Padlock]]
* [[Padlock]]
* [[Pin-tumbler]]
* [[Pin_tumbler|Pin-tumbler]]
* [[Master Lock]]
* [[Master Lock]]


[[Category:Lock_models]]
[[Category:Master_Lock]]
[[Category:Padlocks]]
[[Category:Padlocks]]
[[Category:Master Lock|No 2]]
[[Category:Pin-tumbler locks]]
[[Category:Pin-tumbler locks]]

Latest revision as of 14:08, 28 April 2023

Master Lock No 4



Master Lock No. 4
Master Lock No 4 front - FXE48772.png
Name Master Lock No. 4
Manufacturer Master Lock
Lock Type Padlock, Cylinder
Lock Design Pin-tumbler
Specifications
# of Components 4
Component Type Pin-tumbler


The No. 4 is a pin-tumbler padlock made by Master Lock. The No. 4 uses a laminated brass padlock body with an internal key-in-knob-style cylinder. The inner cylinder uses four pin stacks and does not use any security pins.

The No. 4 is a common low security padlock used in the United States. It is one of a line of laminated brass padlocks that includes the Master Lock #2, #4, #6, and #8.


Principles of operation

The No. 4 cylinder is a pin-tumbler lock with four pin stacks and no security pins. The cylinder typically uses the M1 key profile but may use other profiles, as well. The standard No. 4 can be opened in both directions but the "commercial" series body restricts opening to clockwise rotation. The No. 4 is not a key retaining padlock.

Disassembly instructions

The No. 4 cannot be disassembled non-destructively. To disassemble it the rivets that hold the laminated body together must be removed and each layer removed individually. The inner cylinder itself can be disassembled in the same manner as a traditional pin-tumbler lock:

  1. Remove the cam or C-clip.
  2. Insert the key and turn the plug 45-90 degrees.
  3. Withdraw the plug from the cylinder. (A plug follower is recommended)

OR

  1. Remove the chamber casings and take out each pin-stack individually
  2. Remove the cam or C-clip.
  3. Withdraw the plug from the cylinder.


Notes

  • The No. 4 cylinder requires a small diameter plug follower.
  • The No. 4 plug is retained by a crimp, rather than a C-clip or cam. Above are the generic pin-tumbler disassembly instructions.

Vulnerabilities

The No. 4 is vulnerable to a wide range of attacks. The reduced pin tumbler count and poor manufacturing tolerances makes it an easy lock to pick. It's commonly given to locksport beginners as a "confidence lock"; a lock that is easy to open and inspires you to continue picking. The No. 4 may be vulnerable to one or more of the following:

Gallery

See also