Master Lock No 1: Difference between revisions

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| name = Master Lock No. 1
| name = Master Lock No. 1
| Img = File:Mastercommercial.JPG
| Img = File:Mastercommercial.JPG
| Img_size = 150px
| maker = [[Master Lock]]
| maker = [[Master Lock]]
| lock_type = [[Padlock]], [[Cylinder]]
| lock_type = [[Padlock]], [[Cylinder]]
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| patent =  
| patent =  
| related =  
| related =  
| spec_on      = true
| spec_comptype = [[Pin_tumbler |Pin-tumbler]]
| spec_comp    = 4
}}
}}


The '''No. 1''' is a [[pin-tumbler]] [[padlock]] made by [[Master Lock]]. The No. 1 uses a laminated padlock body with an internal key-in-knob [[cylinder]]. The inner cylinder uses four pin stacks and does not use any [[security pin]]s. The No. 1 is one of the most common low security padlocks used in the United States.
The '''No. 1''' is a [[pin-tumbler]] [[padlock]] made by [[Master Lock]]. The No. 1 uses a laminated 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. 1 is one of the most common low security padlocks used in the United States.


__TOC__
__TOC__
<br clear=all>


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


The M1 cylinder is a [[pin-tumbler]] lock with 4 pin stacks. It does '''NOT''' contain any [[security pin]]s unless otherwise modified.
The No. 1 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. 1 can be opened in both directions but the "commercial" series body restricts opening to clockwise rotation. The No. 1 is not a [[key retaining]] padlock.
 
The No. 1 padlock uses the [[M1]] [[Key#Types_of_Keys|key blank]], but also can be made with a slightly different key profile. This change in profile helps to stop people from making copies of keys they shouldn't have.
 
A standard Master No. 1 padlock can be opened with a key both clockwise and counter clockwise, but due to a shrouding on the commercial series of this lock it can only be opened clockwise and makes picking it counterclockwise require TOK tension.


== Disassembly instructions ==
== Disassembly instructions ==


The No. 1 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:
The No. 1 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:


{{Pin-tumbler standard disassembly}}
{{Pin-tumbler standard disassembly}}
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'''Notes'''
'''Notes'''
* The No. 1 cylinder requires a small diameter plug follower.
* The No. 1 cylinder requires a small diameter plug follower.
* The No. 1 plug is retained by a crimp, rather than a C-clip or [[cam]]. Above are the generic pin-tumbler disassembly instructions.


== Vulnerabilities ==
== Vulnerabilities ==
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<div align="center"><gallery>
<div align="center"><gallery>
File:Master_Lock_commercial_no1_padlock.jpg
File:cutawaym1.JPG|A cutaway No. 1 padlock and cylinder.
File:cutawaym1.JPG|A cutaway No. 1 padlock and cylinder.
File:Master Lock No. 1 insides.jpg|thumb|alt=Master Lock No. 1 insides|Master Lock No. 1 insides
File:Master Lock No. 1 Pins.jpg|thumb|alt=Master Lock No. 1 Pins|Master Lock No. 1 Pins
File:Master Lock No. 1 Actuator (1).jpg|thumb|alt=Master Lock No. 1 Actuator (1)|Master Lock No. 1 Actuator (1)
File:Master Lock No. 1 Actuator (2).jpg|thumb|alt=Master Lock No. 1 Actuator (2)|Master Lock No. 1 Actuator (2)
File:Master Lock No. 1 Actuator (3).jpg|thumb|alt=Master Lock No. 1 Actuator (3)|Master Lock No. 1 Actuator (3)
File:Master Lock No. 1 Actuator (4).jpg|thumb|alt=Master Lock No. 1 Actuator (4)|Master Lock No. 1 Actuator (4)
</gallery></div>
</gallery></div>


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


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


[[Category:Lock models]]
[[Category:Master Lock]]
[[Category:Padlocks]]
[[Category:Padlocks]]
[[Category:Master Lock|No 1]]
[[Category:Pin-tumbler locks]]
[[Category:Pin-tumbler locks]]

Latest revision as of 03:22, 28 August 2024

Master Lock No. 1

Master Lock No. 1
Mastercommercial.JPG
Name Master Lock No. 1
Manufacturer Master Lock
Lock Type Padlock, Cylinder
Lock Design Pin-tumbler
Specifications
# of Components 4
Component Type Pin-tumbler


The No. 1 is a pin-tumbler padlock made by Master Lock. The No. 1 uses a laminated 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. 1 is one of the most common low security padlocks used in the United States.


Principles of operation

The No. 1 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. 1 can be opened in both directions but the "commercial" series body restricts opening to clockwise rotation. The No. 1 is not a key retaining padlock.

Disassembly instructions

The No. 1 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. 1 cylinder requires a small diameter plug follower.
  • The No. 1 plug is retained by a crimp, rather than a C-clip or cam. Above are the generic pin-tumbler disassembly instructions.

Vulnerabilities

The No. 1 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. 1 may be vulnerable to one or more of the following:

Gallery

  • Master Lock commercial no1 padlock.jpg

  • A cutaway No. 1 padlock and cylinder.

  • Master Lock No. 1 insides

    Master Lock No. 1 insides

  • Master Lock No. 1 Pins

    Master Lock No. 1 Pins

  • Master Lock No. 1 Actuator (1)

    Master Lock No. 1 Actuator (1)

  • Master Lock No. 1 Actuator (2)

    Master Lock No. 1 Actuator (2)

  • Master Lock No. 1 Actuator (3)

    Master Lock No. 1 Actuator (3)

  • Master Lock No. 1 Actuator (4)

    Master Lock No. 1 Actuator (4)

See also

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