| Use case | Best-fit lock type | Why it fits | Key limitation to know | Example product on this page |
|---|---|---|---|---|
| Small cabinet, drawer, or file box | Cabinet solenoid lock | This category fits cabinet, drawer, and locker projects where the lock releases a latch rather than acting as a full door deadbolt. | Raw solenoid locks are light-duty release devices, not primary locking bolts for people-dependent doors. | rust-resistant solenoid cabinet lock in 5V/12V/24V |
| Vending machine, locker, mini-fridge, or bank locker | Cabinet lock with hook-style holding strength | The 5/12/24V cabinet lock with 50kg hook strength is positioned for bank lockers, gym lockers, vending machines, and mini-refrigerators. | It still needs a relay or MOSFET for microcontroller control. | alloy-wire cabinet lock for lockers and vending |
| Compact electronics enclosure | Mini solenoid | Tight spaces need smaller body dimensions and shorter travel, not a full cabinet latch assembly. | Short stroke limits what latch travel it can release. | 12V mini solenoid with 20x29x16mm body |
| Intermittent bolt release with more travel | Push-pull solenoid | Use a push-pull style when you need bolt movement rather than a cabinet catch release. The 12V push-pull solenoid lock with 9mm latch stroke uses power-on retract and power-off pop-up operation. | It is for short energized periods only. | 9mm push-pull solenoid lock |
| Framed pedestrian door with existing latch | Electric strike | For a framed door, an electric strike is the better electric door lock choice because it works with the existing latch and keeps mechanical egress and keyed override. | Full pedestrian doors are a separate decision because egress and code matter. | — |
| Glass door, awkward retrofit, or higher holding-force need | Magnetic lock (maglock) | A magnetic lock uses electromagnetic attraction rather than a moving bolt, and offers higher holding force in the 100–500 kg range. | Maglocks require continuous power to stay locked and are fail-safe. | — |
| Battery-powered puzzle box or low-power portable build | Servo motor lock | Servo alternatives make sense when zero holding current matters and the project runs from 5–6V. | More complex linkage is the trade-off. | — |
For escape-route or life-safety doors, fail-safe hardware is the requirement because the door must unlock on power loss. For asset rooms and non-egress doors, fail-secure hardware is the usual choice.
If you are building access control around any of these locks, you may also need an RFID reader module for credential input. Once you have chosen suitable hardware, this DIY smart-lock controller example shows how a microcontroller-based system can be put together.
The most common wiring mismatch is treating lock voltage and controller voltage as the same thing. A 5V logic signal can switch a lock through a driver, but that does not mean the lock itself runs correctly on 5V. GPIO pins supply about 20–40 mA, while solenoids typically need 800 mA to 2 A. A relay, MOSFET, or transistor driver is required between the controller and the lock.
Most 12V solenoid lock models draw 0.8–2A, so the power supply should be rated at least 20% above the lock’s maximum current. For a concrete example, the 12V 9mm push-pull solenoid is specified at 1.2A and 14.4W. On longer cable runs, 24V is preferred because it halves current compared with 12V, but the lock must explicitly support 24V. Voltage support is product-specific. The rust-resistant cabinet lock is offered in 5V, 12V, and 24V variants, and the alloy-wire cabinet lock supports 5V, 12V, and 24V versions as well.
A flyback diode is required to protect microcontrollers, transistors, and relays from inductive kickback when the coil turns off. A 1N4007 is the usual choice. If your controller is reset-prone when the lock activates, a bulk capacitor of 100 µF+ across the supply helps stabilize the rail, especially in Arduino or Raspberry Pi builds. Shoppers using Wi‑Fi controllers often compare this with ESP32 boards or Arduino-compatible boards on the control side.
Check these before ordering:
Duty cycle decides whether the lock can be pulsed for release or held energized for longer periods. Intermittent-duty solenoids commonly overheat if powered longer than about 10–30 seconds, so they are a poor fit for doors that stay unlocked for hours. Continuous-duty models do exist, but continuous duty does not mean the device stays cold.
| Product type / example | Energized-use pattern | Published limit or behavior | Best for | Avoid if |
|---|---|---|---|---|
| 9mm push-pull solenoid lock | Short pulse or brief hold | Maximum 10s power-on time; cooling required between cycles | Intermittent release where 9mm travel is needed | You need a lock held open for long periods |
| 12V mini solenoid | Very short unlock pulse | Recommended 0–5s unlock time and more than a 2 minute interval between uses to prevent overheating | Compact cabinet and electronics enclosures | Frequent cycling or long energized periods |
| General cabinet solenoid lock use | Momentary release | Intermittent duty; often fine for pulse unlocks, not for scheduled all-day unlock | Cabinets, drawers, lockers | High-traffic doors or always-unlocked schedules |
| Motorized lock or proper door hardware | Long unlocked periods or high traffic | Better suited to scheduled-unlock operation than standard intermittent solenoids | Doors that remain unlocked for hours | Simple low-cost cabinet release jobs |
High-traffic or scheduled-unlock doors are better served by motorized locks or proper door hardware rather than standard intermittent solenoids. If your timing logic is on the controller side, date and time modules make more sense than trying to leave the lock energized. If your automation runs from a single-board computer, Raspberry Pi boards still need separate power planning for actuators.
One separate point causes confusion: the 12V 150A continuous duty solenoid relay is a continuous-duty relay for vehicles and motors, not a cabinet or door lock.
Electrical compatibility gets the lock moving, but mechanical fit decides whether it actually releases your latch. Stroke length matters when you are matching latch travel. In compact enclosures, body dimensions matter just as much.
| Product name | Voltage options | Body size | Stroke / travel | Strength / load detail | Mounting aid included | Best-fit application | Duty note |
|---|---|---|---|---|---|---|---|
| Solenoid cabinet lock with rust-resistant metal body | 5V / 12V / 24V | 54x37x28mm | — | — | Mounting board included | Cabinets, file drawers, luggage | — |
| Cabinet lock in 5V, 12V, or 24V versions | 5V / 12V / 24V | 73x14x60mm | — | 50kg hook strength; fits doors 0.5–2kg | — | Bank lockers, gym lockers, vending machines, mini-refrigerators | — |
| 12V push-pull lock with 9mm stroke | 12V | — | 9mm latch stroke | — | — | Intermittent push-pull release | Max 10s power-on; cooling between cycles |
| Mini 12V solenoid for compact locking | 12V | 20x29x16mm | 4.5mm tongue stroke | — | — | Small electronic devices and compact automated cabinet locking | 0–5s unlock; >2 minute interval between uses |
The movement pattern matters as much as the dimensions. The 9mm push-pull model is power-on retract and power-off pop-up, so it suits mechanisms designed around that action. It is also rated for -25℃ to 85℃, which helps in varied environments, but that temperature range is not the same as weatherproofing. The mini 12V option uses an electroplated iron body. It is the smallest choice here when space is the limiting factor. If your project also needs local status or user feedback, many cabinet and locker builds pair the lock with an LCD display. For broader controller context, see this worked smart-lock build.
Yes — a flyback diode is required, it protects against inductive kickback when the coil turns off, and a 1N4007 or similar is the common add-on. Without it, voltage spikes can damage the switching device and cause intermittent controller problems that look like bad wiring or a bad lock.
No — GPIO pins only provide about 20–40 mA, while solenoids typically need 800 mA–2 A, so a relay, MOSFET, or transistor driver is required. The controller pin should switch only the driver stage, while the lock draws power from its own correctly sized supply rail.
Most 12V solenoid locks draw 0.8–2A, and the supply should be rated at least 20% above the lock’s maximum current; for example, the 9mm push-pull model here is rated at 1.2A and 14.4W. In practice, check the lock’s current first, then choose a supply with enough headroom to handle startup pull without sagging.
Intermittent-duty solenoids are usually limited to about 10–30 seconds, and on this page the 9mm push-pull unit is capped at 10s while the mini 12V model is recommended for 0–5s with more than a 2 minute interval between uses. If the application needs hours of unlocked time, standard intermittent solenoids are the wrong product family.
A solenoid lock uses a moving plunger or bolt, while a magnetic lock uses electromagnetic attraction between plates; maglocks typically offer about 100–500 kg holding force and require continuous power to stay locked. That makes a maglock the higher-force option in many door applications, but it also changes fail behavior because maglocks are fail-safe.
For framed pedestrian doors, an electric strike is usually the better choice because it keeps mechanical egress and keyed override, while raw solenoids are generally better suited to cabinets, drawers, and light-duty release tasks. This matters most anywhere people depend on the door, because door hardware and escape behavior are part of the buying decision, not just the voltage.
Most solenoid locks are indoor-use products unless an IP rating is given, and the 9mm push-pull model listing -25℃ to 85℃ is a temperature range, not a weatherproofing claim. If the installation is exposed to rain or washdown, look for a stated IP rating rather than assuming metal construction or temperature tolerance means outdoor-ready.
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