Master Lock No 175
Master Lock No 175
| Master Lock No 175 | |
 | |
| Name | Master Lock No 175 |
|---|---|
| Manufacturer | Master Lock |
| Lock Type | Padlock |
| Lock Design | Combination, resettable |
Master Lock No 175 is a resettable combination padlock made by Master Lock. It has four dials with the digits 0-9. This results in total of 10,000 theoretical permutations.
The Master Lock No 175 series includes solid brass bodied locks. Master now makes the same lock in steel as the M176 and a model M175 that has a different style of internals. The locks described below take a change key, the M175 combination is designed to be changed by specific manipulation of the shackle(like the Master Lock No 975)
Operating Instructions
- Move each of the four dials to the correct digit
- Push down slightly on the shackle and release
- If the combination is correct the shackle will be free
Internals
An actuator that sits between the pawls and has fingers which rest on wheels. The wheels lock in to the dials the user interacts with. Each wheel needs to have the flat of the wheel facing the front of the lock, 5 steps off of the center of the flat is a will that allows the wheel to pass over part of the body during the combination change. When all the flats are facing the front of the lock the fingers can go down and allow the top of the actuator to move out from between the pawls.
The are variations with pin tumbler core on the side to allow supervisor access. The core has a long half cylinder as the tail which lifts the actuator when the tumbler is turned.
Vulnerabilities
The Master Lock No 175 series may be vulnerable to one or more of the following:
Gallery
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