Electromechanical lock with pusher

Electromechanical lock, which:

  • pushes (“outshoots”) the deadbolt when opening, which leads to “opening” of the door;
  • works even when an external opening force is applied to it (e.g. pulling the door handle)


Promix-SM104 - photo - 42


“Promix-SM104” is the new name of the “Sheriff-4” series of locks.


The lock is designed for installation in luggage lockers, built-in cabinets, lockers in locker rooms, drawers for storage of documents, fire hose cabinet, etc.

It is possible to use the lock to keep the doors open/closed.

The lock allows not to install the handle on the door, because when you open the lock, the door “opens” itself (see video).

  • Unique balance between the dimensions, holding force and input current.
  • Automatic adjustment of the deadbolt in case of inaccurate installation or sagging of the door

Designation of the lock model:


Promix-SM104.XY.Z,   where:


X - lock version:  

1 - normally closed;

Y - nominal supply voltage:

0 - 12 V, 
1 - 24 V;

Z - availability of built-in sensors:  

0 (n/a) - no sensors, 
1 - door position sensors.


The modifications of locks available for order are shown in the table:

Модель замка  Описание

Normally closed (opens when supply voltage is applied),

supply voltage 12V


Normally closed (opens when supply voltage is applied),

supply voltage 24V


Normally closed (opens when supply voltage is applied),

supply voltage 12V, built-in door position sensor 


Technical characteristics

  • Normally closed 
  • Overall dimensions (diameter x length), mm: 20 х 67
  • Deadbolt holding force, kg, at least: 300
  • Weight, g: 115
  • Supply voltage (DC), V: 12/24
  • Input current: 0,35/0,22A 
  • Pulse duration to open the lock, sec: 0.5-3 (not standardized)
  • Interval between pulses of supply voltage, sec, at least: 15 (not standardized)
  • Initial static force of door opening, kg: 0.7 
  • Lock and deadbolt coating: H9, C6Hr


Lock connection options 

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


Normally closed locks are unlocked by applying the supply voltage. For operation, the lock requires a power supply unit and an ACS controller.

To open the lock, the ACS controller must supply the supply voltage to the lock for a time not exceeding that specified in the technical specifications.


Promix-SM104 Operating Manual EN (download)

3D-model of the Promix-SM104.STEP (download)

3D-model of the Promix-SM104 with door position sensor.STEP (download)

Photos and videos

Principle of operation of the lock

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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New patent has been obtained!


We got another patent for electromechanical lock with flexible steel deadbolt Promix-SM325.


This lock is used to secure electric scooters operating in Kicksharing (rental)

New Official Distributor in UK!!!


We are thrilled to introduce our new Official Distributor in United Kingdom - Electric Locking Systems LTD!!!
Happy to be presented on the UK market and bring Promix products to british customers.


New patent has been obtained!


Happy to announce that our company got approval of the new patent for electromechanical locking of the battery compartment of electric scooter.
All news
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