---
product_id: 74924001
title: "Fail Safe DC12V Electric Bolt Mortise Door Lock Electronic Drop Bolt Lock with time delay Normally Close for Access Control Security System"
brand: "hfeng"
price: "Bs.960"
currency: BOB
in_stock: false
reviews_count: 6
url: https://www.desertcart.bo/products/74924001-fail-safe-dc12v-electric-bolt-mortise-door-lock-electronic-drop
store_origin: BO
region: Bolivia
---

# Adjustable 0/3/6 sec delay Fail-safe locking mode Durable aluminium alloy Fail Safe DC12V Electric Bolt Mortise Door Lock Electronic Drop Bolt Lock with time delay Normally Close for Access Control Security System

**Brand:** hfeng
**Price:** Bs.960
**Availability:** ❌ Out of Stock

## Summary

> 🔐 Lock in security, unlock peace of mind — the future of fail-safe access control!

## Quick Answers

- **What is this?** Fail Safe DC12V Electric Bolt Mortise Door Lock Electronic Drop Bolt Lock with time delay Normally Close for Access Control Security System by hfeng
- **How much does it cost?** Bs.960 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/products/74924001-fail-safe-dc12v-electric-bolt-mortise-door-lock-electronic-drop)

## Best For

- hfeng enthusiasts

## Why This Product

- Trusted hfeng brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Customizable Time Delay:** Set your preferred 0, 3, or 6 seconds delay for smooth, controlled locking tailored to your access needs.
- • **Interference-Free Stability:** Advanced circuit design eliminates external interference, delivering reliable and secure operation every time.
- • **Robust Aluminium Alloy Build:** Crafted from high-quality aluminium alloy for long-lasting durability and premium resistance against wear.
- • **Versatile Door Compatibility:** Perfectly engineered for both wooden and metal doors, making it the smart choice for modern access control.
- • **Power-On Lock, Power-Off Unlock:** Fail-safe design ensures security during power supply and automatic unlock on power loss for emergency safety.

## Overview

This DC12V electric bolt mortise door lock features a fail-safe mode that locks when powered and unlocks during power loss, ensuring emergency access. Made from durable aluminium alloy, it offers adjustable time delay settings (0, 3, or 6 seconds) for tailored security. Designed for wooden and metal doors, it boasts a stable, interference-free circuit for reliable performance in professional access control systems.

## Description

This door lock is special in design with durable material. It can protect your home or business shops.Low operational and standby current. It's especially suitable for wooden and metal doors. Product Features 1. 100% brand new and high quality 2. Secure mode: The door will lock while supplied with power, and unlock without power 3. Especially suitable for wooden and metal doors. 4. It is made from durable and high aluminium alloy material, durable for use 5. Special circuit design, the door will unlock until the power is cut off 6. With no external interference, making it more stable and safer 7. With 0, 3, 6 seconds time delay adjustable Product Specifications Material: Aluminium Alloy Working Voltage: DC12V Lock Mode: Magnetic inductionDimension: 150*34*28 mm Lock Mode: Magnetic induction Secure Mode: NC model/ fail safe model ( Locked when power on, unlocked when power off ) Working Current: star-up: 1.2A, operating: 0.25A Wiring Diagram Red Wire: +12VDC Black Wire: -GND Yellow wire: NC White Wire: COM If you want to test the lock, please connect the red cable to "+12v”, and black cable to “GND" of the 12VDC power supply. When you install completed access control system kit set, please connect red cable to "NC", black cable to "COM" of the power supply. Don’t need to connect the yellow and white cable. Package Including 1 x electric drop bolt lock 1 x Package of screws 1 x Installation Instructions

Review: Value for money - I attached to inside of my porch door and hooked it up to a WiFi controlled switch so I could lock and unlock it using a mobile app. I kept having people walk up my drive and nose in to my porch to see if there was any packages in there, now the lock is on I can lock the porch door after desertcart or any other packages have been delivered.
Review: Den produkt är bra . Nakdelen är bara att den "felsäkert läget" gör att den öppnas när strömmen försvinner - vilket kan vara opraktiskt när man använda det i ett förrådsdörr och det blåser. Dessutom behöver man monterar bägge delar. Det sitter en sensor i "hålsidan" som gör att den inte stängs om den inte har kontakt med sensorn. Därmed underviker man att dörren kan tar skada när den sla mot en utskjuten bult. Men har man inte plats för den bökiga mottagaredelen kan man också köpa den lås med en platt mottagare.

## Features

- 1. 100% brand new and high quality.
- 2. Fail safe mode: The door will lock while supplied with power, and unlock without power
- 3. With no external interference, making it more stable and safer.
- 4. Made of durable and high aluminium alloy material, durable for use
- 5. With 0, 3, 6 seconds time delay adjustable. Especially suitable for wooden and metal doors.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07DNRNJ9H |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 649,547 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,512 in Home Alarm Systems |
| Colour | Silver |
| Customer Reviews | 4.1 4.1 out of 5 stars (61) |
| Date First Available | 6 Jun. 2018 |
| Included Components | Screws, User Manual |
| Item Weight | 454 g |
| Item model number | 3216551969 |
| Manufacturer | HFeng |
| Material | Aluminium |
| Number of Pieces | 12 |
| Part Number | 1 |
| Product Dimensions | 19.4 x 11.8 x 4.6 cm; 453.59 g |
| Shape | Rectangular |
| Size | 150*34*28 |
| Special Features | Electric |
| Style | NO Strike Lock |
| Voltage | 12 Volts |

## Product Details

- **Brand:** HFeng
- **Item dimensions L x W x H:** 19.4 x 11.8 x 4.6 centimetres
- **Lock type:** Mortise Lock
- **Material:** Aluminium
- **Special feature:** Electric

## Images

![Fail Safe DC12V Electric Bolt Mortise Door Lock Electronic Drop Bolt Lock with time delay Normally Close for Access Control Security System - Image 1](https://m.media-amazon.com/images/I/41FxFbaCdpL.jpg)
![Fail Safe DC12V Electric Bolt Mortise Door Lock Electronic Drop Bolt Lock with time delay Normally Close for Access Control Security System - Image 2](https://m.media-amazon.com/images/I/41MiGjVPiSL.jpg)
![Fail Safe DC12V Electric Bolt Mortise Door Lock Electronic Drop Bolt Lock with time delay Normally Close for Access Control Security System - Image 3](https://m.media-amazon.com/images/I/41NzPIH2QWL.jpg)
![Fail Safe DC12V Electric Bolt Mortise Door Lock Electronic Drop Bolt Lock with time delay Normally Close for Access Control Security System - Image 4](https://m.media-amazon.com/images/I/41Zh3wfxkGL.jpg)
![Fail Safe DC12V Electric Bolt Mortise Door Lock Electronic Drop Bolt Lock with time delay Normally Close for Access Control Security System - Image 5](https://m.media-amazon.com/images/I/41e-FMF2ZfL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Value for money
*by B***Z on 21 December 2022*

I attached to inside of my porch door and hooked it up to a WiFi controlled switch so I could lock and unlock it using a mobile app. I kept having people walk up my drive and nose in to my porch to see if there was any packages in there, now the lock is on I can lock the porch door after Amazon or any other packages have been delivered.

### ⭐⭐⭐⭐ Review
*by A***E on 31 May 2023*

Den produkt är bra . Nakdelen är bara att den "felsäkert läget" gör att den öppnas när strömmen försvinner - vilket kan vara opraktiskt när man använda det i ett förrådsdörr och det blåser. Dessutom behöver man monterar bägge delar. Det sitter en sensor i "hålsidan" som gör att den inte stängs om den inte har kontakt med sensorn. Därmed underviker man att dörren kan tar skada när den sla mot en utskjuten bult. Men har man inte plats för den bökiga mottagaredelen kan man också köpa den lås med en platt mottagare.

### ⭐⭐⭐⭐⭐ Review
*by E***R on 10 December 2018*

Just wanted to add a couple of notes since the instructions are so poor. 1. To test the unit, requires 12+ to Red wire, GND- Black wire and the Strike plate(for lack of a better word) must be next to the lock 2. The LED will go from Red to Green is the striker plate is near. 3. For a test when just sitting on my desk, after the lock has been closed for several seconds, the lock dose not disengage if the striker plate is pulled away. Don't see this as a problem, just a difference in operation if I put the striker close and pull away right after it engaged the bolt retracts. The white and yellow wires always have the correct value. 4. The Yellow and White wire short if the lock is close to the striker plate. At your own risk you maybe able to use a pull resistor and connect the other(White wire)to GND and create a signal when the door is closed.

## Frequently Bought Together

- Diginex HFeng DC12V Electric Drop Bolt Lock Fail Safe NC Electronic Mortise Lock for Access Control System Kit Wooden/Metal Door with Time Delay
- Extel WECA 90201.4 Recessed Electric Strike Low Consumption with Pulse Memory
- OBO HANDS Door Access Control System Power Supply (AC 110-240V to DC12V 3A, 36W)

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-02-04*