12V Drop Bolt Lock – Electric Door Lock for Access Control Systems

The 12V Drop Bolt Lock is a reliable electric locking solution designed for modern access control and door security systems.

It works by extending a solid metal bolt into the door frame when powered, providing strong and secure locking. When power is cut, the lock automatically releases, ensuring safety during emergencies.

Operating on 12V DC, this drop bolt lock is compatible with RFID readers, biometric systems, keypads, push buttons, and door controllers.

Made from high-quality stainless steel, it offers long-lasting performance, corrosion resistance, and smooth operation. It is widely used in offices, shops, apartments, and commercial buildings.

This lock is especially suitable for frameless glass doors when used with a U bracket.

Package Includes

1 × 12V Drop Bolt Lock

Mounting Screws

Wiring Cable

Installation Guide

The standard electric drop bolt for access control doors. This 12V bolt lock secures a door by driving a solid steel bolt down into a receiving plate in the frame or floor. Power controls whether the bolt is thrown or withdrawn, and your access control system decides when. It is the straightforward, economical choice for wooden, metal, and framed doors where you want genuine mechanical strength rather than magnetic holding.

Bolt or magnet, and how to decide. A magnetic lock holds the door with an electromagnet and releases the moment power is lost. A drop bolt physically pins the door and, in standard form, stays locked without power. The bolt resists forcing better because an intruder is working against steel rather than magnetic attraction. The magnet is safer on escape routes because nobody can be trapped. Decide by what the door is for: a store room, server room, or back office suits a bolt; a main exit route suits a magnet, or a bolt with an emergency release fitted alongside.

Fail secure, and what load shedding means for you. Because this stays locked when power is absent, your door remains secure right through an outage. That is exactly what you want overnight on a store room or godown. The consequence is equally important: without power, and without a manual override, nobody opens that door until the electricity returns. If the room needs to be accessible at all times, either fit the key cylinder version, add a backup supply, or install a break glass release. Make this decision before installation rather than discovering it during an outage.

Where it fits well. Wooden and metal framed doors, narrow doors where a large magnetic lock plate will not sit properly, office doors, store rooms, godowns, server rooms, and internal secure areas. Drop bolts need far less mounting surface than maglocks, which is often the deciding factor on slim door sections.

Set the timer delay generously. Most drop bolts offer an adjustable delay before the bolt drops, commonly a few seconds. This exists so the door can close and settle before the bolt tries to engage. Set too short, the bolt fires while the door is still moving and either jams against the plate or misses the hole. A very large share of complaints that a bolt lock is faulty are simply a delay set too tight. Give it time and the lock behaves properly.

Alignment matters far more than with a magnet. A magnetic lock tolerates small variation because it holds by surface contact. A bolt must physically drop into a hole. Fit the receiving plate so the bolt lands centred rather than at the edge, and remember that doors settle on their hinges and frames move with heat and humidity through the Pakistani year. A lock fitted with no tolerance in spring may bind by peak summer. When a bolt starts grinding or failing to throw, check alignment before assuming the lock has failed.

What the complete installation needs. The bolt is one component. A working door also requires a controller such as an access keypad or card reader, an exit button on the inside so people can leave, a power supply rated for the lock, and mounting hardware suited to your door. Buying these as a matched set avoids the common situation of an electrician on site discovering a part is missing. We can quote the full kit.

Current draw compared with a maglock. A drop bolt draws current only while operating, not continuously, unlike a magnetic lock which consumes power the entire time the door is locked. Across several doors this makes a meaningful difference to power supply sizing and running cost, and it is a practical argument for bolts on multi door installations.

Cabling and security. Run cable in conduit and keep it inside the secure side of the door. An accessible lock cable is an obvious weak point, since cutting it on a fail secure bolt will not open the door but does disable your control over it.

Do I need the version with a key cylinder? If being locked out during a power cut would cause a real problem, yes. Our key cylinder version lets you withdraw the bolt mechanically regardless of power.

Is it suitable for a fire exit? Not on its own. A fail secure bolt on an escape route needs an emergency break glass release fitted alongside. Tell us if the door is on an escape route.

Will it fit a glass door? For frameless glass, use our glass door drop bolt with the appropriate U bracket or patch fitting instead.

Why does the bolt sometimes not enter cleanly? Alignment or too short a timer delay. Both are adjustable and neither indicates a faulty lock.

Buying from ZZ Marts. In stock at our Karachi (Saddar) and Lahore stores with nationwide delivery, supplied by Zam Zam Traders, trading in access control since 2005. We also stock key cylinder versions, glass door bolts, five wire bolts with status output, magnetic locks and brackets, exit buttons, break glass releases, power supplies, and access keypads. Send us a photograph of your door and we will confirm the right lock and specify the whole installation.