Electromechanical rim lock for plastic doors and windows
  • Extremely simple installation
  • Should be installed near the handle to eliminate the distortion of the plastic door during operation
  • Suitable for most plastic doors manufactured in Russia
  • Two operation modes: normally open or normally closed
Promix-SM305 - photo - 36
Promix-SM305 - photo - 36 Promix-SM305 - photo - 35 Promix-SM305 - photo - 34 Promix-SM305 - photo - 33 Promix-SM305 - photo - 32 Promix-SM305 - photo - 31 Promix-SM305 - photo - 30 Promix-SM305 - photo - 29 Promix-SM305 - photo - 28
Power supply voltage: 12V
Holding force: not less than 300 kg
Electric current consumption: less than 100mA
Normally open (NO - open without supply voltage), or normally closed (NC - closed without supply voltage) version
  • Extremely simple installation
  • Should be installed near the handle to eliminate the distortion of the plastic door during operation
  • Suitable for most plastic doors manufactured in Russia
  • Two operation modes: normally open or normally closed


“Promix-SM305” is the new name of the “Sheriff-5” series of locks.

Promix-SM305 electromechanical lock is designed for locking swing plastic doors and windows, with the possibility of their remote opening with the help of controllers of access control system, audio and video intercoms, keypads. The design provides for emergency manual opening of the lock (see the Operating Manual).

Normal operation of the lock is designed for a gap between the frame and the door in the range of 10 to 15 mm.

The lock outer body and the strike plate of the deadbolt have special standard shape and are suitable for most plastic profiles produced in Russia. This allows to minimize carpentry.

The design provides adjustment of the deadbolt in the horizontal and vertical planes. Adjusting shims are used to correct the deadbolt position depending on the gap between the door frame and the door.

The lock can be installed on street doors provided that most of the winter time the supply voltage is applied to the lock.

kreplenie_zamka_-1 kreplenie_rigelya_na_dver

When the door is closed, the deadbolt enters the lock and is locked with a hook-grip. There is a possibility of emergency opening of the lock - for this purpose, it is necessary to move the lever in the opposite direction:


Lock connection options 

(power voltage can be applied to the lock by a switch, intercom, controller, etc.)



Manufacturers of doors or windows can fail to comply with the requirements of manufacturers of plastic profile and hardware as to gaps!

Before installation of the lock, make sure that the gap between the doorframe and the door is 10-15 mm.

In Russia, plastic profiles and doors of various configurations are used. Before buying the lock, please make sure that the lock will fit the intended installation location (see drawings and documentation).

Examples of installation of Promix-SM305 lock on plastic profiles:

If you noticed a mistake in the description or you have a proposal as to the lock installation option, please, write to:


 Designation of the lock model:

Promix-SM305.XY,   where:


X - lock version:  

0 - normally open, 
1 - normally closed;

Y - nominal supply voltage:

0 - 12 V 


The modifications of locks available for order are shown in the table (see colors above):

Lock model  Description

Normally open (opens when supply voltage is removed),
supply voltage 12V



Normally closed (opens when supply voltage is applied),
supply voltage 12V



Technical characteristics

  • Power supply voltage: DC 11-14V
  • Input current (at DC 12V): 100 мА
  • Holding force: at least 300 kg
  • Acceptable gap between the doorframe and the door: 10÷15mm
  • Operating temperature range: -40...+50 0C
  • Body material: steel painted with polyester powder enamel
  • Color: white
  • Operation mode: normally open, normally closed



Promix-SM305 Operating Manual EN  (download)

3D-model of the Promix-SM305.STEP (download)

We will be glad to see you as a client of Promix Engineering and Production Center
You can see the full range of Promix equipment and locks in our catalog
If you have any questions, you can contact a Promix manager by + 7 (4812) 619-330
You can also leave a request using the feedback form
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