Master Lock No 140
Master Lock No. 140
| Master Lock No. 1 | |
 | |
| Name | Master Lock No. 1 |
|---|---|
| Manufacturer | Master Lock |
| Lock Type | Padlock, Cylinder |
| Lock Design | Pin-tumbler |
The No. 140 is a pin-tumbler padlock made by Master Lock. The No. 140 is a solid body padlock. The inner cylinder uses four pin stacks and does contain security pins.
Principles of operation
The No. 140 cylinder is a pin-tumbler lock with four pin stacks and either 1 or more security pins. The older versions of this lock had only one spool pin in the 3rd position, but Master Lock changed this so that now the lock has varying amounts in varying locations. The No. 140 can only be opened clockwise.
Disassembly instructions
The No. 140 cannot be disassembled non-destructively. To disassemble it the lock must be sawed in half. Because the lock body is the outer cylinder for this lock, the lock will be nonfunctional if this is done.
Vulnerabilities
The No. 140 is vulnerable to a wide range of attacks. Other then the security pins the reduced pin tumbler count and poor manufacturing tolerances makes it an easy lock to pick and it is often given to lock picking beginners to learn about security pins. The No. 140 may be vulnerable to one or more of the following:
