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Magnetic Door Latches: Designs, Applications and Features

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Introduction

This article will take an in-depth look at magnetic door latches.

The article will bring more detail on topics such as:

  • Principles of Magnetic Door Latches
  • Magnetic Door Latches: Design, Installation and Materials Used
  • Types of Magnetic Door Latches
  • Applications and Benefits of Magnetic Door Latches
  • And Much More…
Standard Latch vs. Magnetic Door Latch

Chapter 1: Understanding the Principles of Magnetic Door Latches

This chapter delves into the function and operation of magnetic door latches.

Defining Magnetic Door Latches

A magnetic door latch is an apparatus consisting of a magnetic component and a corresponding striking pad, crafted to keep doors and gates securely closed. Often called magnetic door stops, door magnets, or magnetic catches, these devices are commonly applied in cabinets and lightweight doors.

Magnetic Door Catch/Latch

These latches include a magnetized catching body paired with a ferromagnetic strike plate, making them highly effective for automatically securing furniture doors. Some models feature dual magnets—one affixed to the door and another to the frame—ideal for low-traffic, light-duty settings.

The magnetic door latch's casing is often constructed from non-ferromagnetic metal or plastic. A bar magnet resides within this non-magnetic housing. Steel plates are appended to both the bottom and top of the bar magnet, enhancing magnetic flux concentration. The steel plates meet the striker plate during contact. These latches can be either surface-mounted or concealed to the door jamb or frame, with the strike plate on the door edge. The magnet and metal strike plate make contact when the door closes, creating a strong magnetic connection.

Magnetic Door Latch

Typically, a magnetic catch includes an armature plate coupled with a magnet. One side of an object is fitted with the magnet, while the armature plate is affixed to the opposite side. Once installed, the magnetic attraction binds the two elements. To separate them, the magnetic bond is disrupted by pulling them apart.

Electromagnetic locks, another variation of magnetic latches, operate through electrical power and often connect with access control systems. These systems may engage signals from various devices, such as motion sensors, exit request switches, or credential readers, commonly integrated with exit devices featuring signal switches to manage these locks.

Magnetic Lock

Magnetic latches are designed for fail-safe functionality, remaining unlocked when power is disrupted. Continuous electrical power maintains the locked state. These devices are capable of operating on either AC or DC current, providing substantial holding force once locked. Depending on the application, greater holding force may be warranted. Magnetic locks paired with fire-rated doors must link to fire alarm systems, releasing during an alarm to allow evacuation even during power outages.

Locks with holding forces of 500 to 1,000 lbs. suit interior wood and aluminum doors requiring minimal security. For greater security needs, locks with 1,000 to 3,000 lbs. holding capacity are advisable for more robust, hollow metal doors and frames.

Magnetic locks come in diverse shapes and sizes—round, square, and rectangular—with larger models offering stronger holding forces. They function on AC or DC power based on requirements, with efficiency varying by power consumption. Certain models incorporate battery backup to ensure locking functionality during power interruptions.

The Functionality of Magnetic Door Latches

An electromagnetic lock operates by utilizing electromagnetism to secure a door when the system is energized. The holding power must align with the load, with the lock and armature plate positioned directly opposite each other. This magnetic lock draws upon basic electromagnetism principles, involving an electromagnet that creates a robust attraction between components to prevent the door's opening. Notably, these devices utilize a current passing through coiled wire loops (or solenoids) to generate a magnetic field.

Magnetic Door Latch Functioning

This electromagnetic principle functions in open space but is greatly amplified when the solenoid envelops a ferromagnetic core, like soft iron. This core alignment causes significant increases in the magnetic flux density, enhancing the latch’s overall effectiveness.

Chapter 2: What are the Design, Installation, and Materials Used for Magnetic Door Latches?

This chapter provides a comprehensive guide on the design, installation processes, and materials used in magnetic door latches, often called magnetic catches or magnetic locks. It also addresses essential decision-making factors for selecting the right magnetic door latch for various residential, commercial, industrial, and institutional applications, helping users navigate the wide range of security hardware options available.

Magnetic Door Latch Design

A modern magnetic door latch is typically composed of a precision-engineered metal plate, usually steel, and a high-strength permanent magnet or electromagnet. Most magnets for this application are housed within a durable plastic casing, sometimes featuring flanges with screw holes on three sides to secure the magnetic catch to the door or frame. This combination ensures robust holding power and seamless operation, whether for access control, cabinet doors, or high-security entryways.

The strong magnetic force is calibrated to hold doors—ranging from standard interior doors to heavy-duty security doors—firmly shut, but still allows for easy disengagement with manual or automated force. After a cabinet or cupboard has been accessed, simply swinging the door closed realigns the magnetic catch, snapping the door shut without jamming. This user-friendly and highly reliable mechanism makes magnetic door latches a popular solution in access control systems and modern smart home upgrades.

Magnetic Door Latch Design

Latches are available in a variety of designs to suit diverse operational and aesthetic needs. Factors such as material, surface finish, latch thickness, and other technical specifications are integral to performance and visual appeal. Optimizing these parameters ensures compatibility with architectural hardware, security solutions, and specific applications.

Material: Most high-quality magnetic latches are manufactured from metals with excellent tensile strength and durability, including carbon steel, alloy steel, stainless steel, aluminum alloys, and copper alloys. These metals provide high formability, machinability, and resistance to deformation. Enhancements like powder coating, plating, or painting further increase corrosion resistance, making magnetic door latches ideal for outdoor and harsh-environment projects. Additional use of polycarbonate plastics and rubber inserts helps dampen noise, absorb shock, and reduce vibration in environments where frequent door access is required, such as hospitals or laboratories.

Magnetic Door Latch Copper Coating

Finishing and Coating: Advanced finishing techniques such as electroplating (zinc, silver, or chromium), powder coating, and paint application provide additional protection against rust and chemical corrosion. These treatments not only extend the working lifespan but also provide options for decorative finishes compatible with modern and traditional architectural designs. In outdoor or industrial settings, these finishes can help latches withstand weathering and repeated cycles of opening and closing.

Polishing and Buffing: To ensure optimal surface smoothness and aesthetic shine, latches undergo processes such as mechanical polishing and electrochemical buffing (e.g., electropolishing). These techniques help eliminate burrs and microscopic flaws, yielding a high-quality finish that enhances tactile experience and cleanliness.

Door Latch White Powder Coating

Powder Coating and Painting: Powder coating and painting add a protective polymer layer to door latches, shielding them from moisture, chemicals, and abrasion. These coatings are vital for products used in marine environments, laboratories, kitchens, and exterior doors, as they further heighten corrosion resistance and enable color customization for branding or aesthetic integration.

Strength: Magnetic latch strength is categorized as light-duty, medium-duty, or heavy-duty, determined by the thickness and composition of critical latch components such as plates, barrels, cams, and rotors. The robust structure and engineering design allow latches to withstand significant shear and bending forces, ensuring reliable hold and security.

Mounting: Door latches can be installed in a variety of ways—flush-mounted, mortised, or surface-mounted—to accommodate architectural and retrofit requirements. Flush and mortise installations offer discreet visuals ideal for luxury interiors and secure entryways, while surface mounting provides a cost-effective, quick-installation solution more common in industrial or retrofit settings.

Handedness: Door orientation matters in latch installation. Latches are available in left-handed and right-handed configurations, especially for specialized products like deadlatches, bolt latches, rotary, and slam latches. Many designs are reversible or adjustable with minor modifications, ensuring universal compatibility with a wide range of door sets and security systems. Confirming handedness based on hinge placement prevents installation errors and operational issues.

How Magnetic Door Latches are Installed

Magnetic locks and door latches are suitable for both inward- and outward-swinging doors, as well as for high-traffic commercial entrances, fire-rated doors, and automatic access systems. To guarantee precise armature alignment, manufacturers provide a selection of mounting brackets—including L brackets, LZ brackets, and U brackets—for adaptability with different frame geometries and installation contexts. When mounting space is limited or the lock body is oversized relative to the door frame, filler plates help expand the mounting surface for secure installation. Always install magnetic locks on the secure (protected) side to optimize building security.

Magnetic Door Latch Installation

For inward-swinging doors, secure the electromagnet to the header at the top of the door frame. Full-length housings allow vertical installation inside deeper frames. Align the armature plate with the magnet face by fixing it directly to the door so optimum magnetic holding force is achieved when the door is fully closed.

For outward-swinging doors, attach the electromagnet to the side header and fit the armature on a Z-shaped or adjustable bracket fixed to the door. This configuration is common in access control applications in offices and retail settings. Integrated into modern security systems, magnetic locks can work seamlessly with proximity keycard readers, biometric access modules, smart locks, and centralized building management systems for remote control and monitoring.

Innovations in electromagnetic locking technology have led to the development of shear locks and fail-safe/fail-secure magnetic locks. Shear locks allow for bidirectional swinging, functioning by shearing rather than direct pull, which increases versatility and security where both push/pull door operation and electronic access are needed. Fire safety compliance is essential for magnetic lock installations; ensure all electrical and cabling work meets national, state, and local codes, and always integrate fail-safe operations or emergency release for egress doors.

Materials Used in Magnetic Latches

Regardless of the model—residential, industrial, commercial, or institutional—most door latches are produced using precision metal stamping and spot-welding techniques. High-strength sheet metal is shaped, adjusted, and welded to form the main components, ensuring resistance to stress, wear, and repeated use. These manufacturing methods make magnetic latches highly durable and cost-effective, suitable for applications from kitchen cabinets to commercial entryways and access control points.

Aluminum on Door Latches

Aluminum: Aluminum is prized for its light weight, rust resistance, and cost-effectiveness. Magnetic latches made from aluminum are easy to install and popular in both residential and commercial projects. While affordable, aluminum latches are best used in light to medium-duty applications, as their lower density means less resilience compared to steel or stainless steel.

Brass on Door Latches

Brass: Celebrated for its premium look, brass is often chosen for decorative or luxury projects, such as boutique stores or upscale home interiors. Although not as common as other metals for latching mechanisms, brass complements traditional design and requires frequent polishing to retain its elegant finish.

Bronze: Known for its durability and unique patina, bronze provides a distinct appearance and excellent resistance to corrosion and chipping. The upfront cost is higher, but for architectural hardware applications requiring both performance and visual style, bronze latches offer excellent longevity and minimal maintenance.

Bronze on Door Latches

Chrome: Chrome-plated magnetic door latches are selected for their glossy, reflective finish, perfect for contemporary décor. However, chrome is more prone to scratches and chipping than more robust options such as stainless steel, making it better suited for low-traffic applications.

Chrome on Door Latches

Iron: Iron latches with black powder-coated finishes are rugged and suitable for a wide range of industrial, rural, or rustic applications. They require routine maintenance and anti-corrosion treatment in humid or outdoor environments but excel indoors where rusting risk is low. Regular cleaning and occasional re-spraying ensure continued function and appearance.

Iron Material on Door Latches

Stainless Steel: The gold standard for weather resistance, strength, and longevity, stainless steel magnetic latches maintain their shine and resist corrosion—even in coastal or industrial areas where moisture and chemicals are constant threats. Both powder-coated and uncoated stainless steel options are available, making this material ideal for external security doors, commercial kitchens, and high-traffic institutional venues. Routine maintenance involves cleaning with mild soap and water to avoid marking or corrosion buildup.

Stainless Steel Door Latches

Plastics: Where lightweight solutions are sufficient, high-strength thermoplastics such as nylon, polycarbonate, and ABS deliver cost-effective and corrosion-proof performance. While optimal for interior storage or lightweight access panels, modern engineered plastics can meet demanding commercial requirements in select cases, especially when paired with embedded neodymium magnets or specialized catch designs for higher holding force.

How to Choose a Magnetic Door Latch

Selecting the optimal magnetic door latch or magnetic catch depends on several interrelated factors tailored to specific use cases—residential entry doors, commercial interior doors, cabinet doors, or advanced access control systems. Key considerations include:

  • Material Selection: Determine whether high-durability metals, lightweight aluminum, corrosion-resistant stainless steel, or impact-resistant plastics best suit your environment and security requirements.
  • Magnet Type: Identify whether a permanent magnet or an electromagnet is ideal. Permanent magnets offer simple, electricity-free operation (as in most cabinet magnetic catches), while electromagnetic locks are best for high-security, remotely controlled environments, and integration with alarm or entry systems.
  • Shape and Form Factor: While rectangular latches dominate, consider cylindrical or barrel-shaped magnetic catches for hidden applications or specialized cabinet constructions. The barrel design can house multiple magnets to increase holding force for heavier doors or panels.
  • Size (Height, Depth, Width): Ensure dimensional compatibility with your door, frame, or object for both mounting and operational clearance. Incorrect sizing can lead to misalignment or reduced security.
  • Holding Force: Measured in pounds, kilograms, or Newtons, holding force represents the strength needed to keep the door securely closed. For commercial and security-grade doors, opt for magnetic latches with certified holding forces that match your safety and compliance needs.
  • Armature Size: Pair the magnet and corresponding metal plate for an exact fit with your door's construction, as an improper sizing can compromise security and longevity.
  • Voltage and Current Ratings (for electronic latches): Understand the electrical specs (volts and amps) to ensure compatibility with your facility’s power supply or existing electronic access control system.
  • Durability and Environmental Resistance: For doors exposed to the elements or corrosive conditions, choose latches with advanced coatings, waterproof casing, or IP-rated hardware for long-term reliability.

Evaluate additional attributes such as fire rating compliance, ADA accessibility, remote access capability, and compatibility with smart home technology. Prioritizing these features enhances safety, code compliance, and end-user convenience. When selecting suppliers or manufacturers, verify that products meet industry standards such as ANSI/BHMA, UL, or CE certifications for performance and reliability.

Traditional Door Latches vs. Electric Door Latches

Understanding the differences between traditional mechanical door latches and modern electric or magnetic door locks is key when evaluating security, convenience, and emergency procedures in residential and commercial projects. Traditional key-operated latches, including mortise locks and pin-and-tumbler mechanisms, offer mechanical reliability and are not affected by power interruptions. However, they can be limited by lost keys, physical wear, or lock-picking vulnerabilities.

Standard Latch vs. Magnetic Door Latch

Electronic and magnetic door latches leverage access credentials such as keycards, fobs, PIN codes, or smartphone authentication, greatly enhancing both security and convenience. With programmable electronic controls, it is easy to change access codes, track entry and exit, or remotely manage doors via apps or integrated building management systems. However, power outages or battery failures can temporarily limit function, so backup systems and fail-safe mechanisms (emergency egress, mechanical key overrides, or battery backups) are strongly recommended for critical areas.

Hybrid access control solutions combine both physical and electronic locking systems, giving users the option of mechanical key access for emergencies, alongside the day-to-day convenience and tracking capabilities of electronic systems. The "actuator" in electric latches activates a lock bolt or cylinder via a concealed motor, which responds to legitimate electronic signals. The safety, adaptability, and configurability of these locks make them increasingly popular in office buildings, hospitals, retail, and multi-family residential complexes.

For sliding doors, electronic magnetic locks provide new opportunities for streamlined access, offering the same holding force and convenience in non-standard door formats that often lack traditional latch solutions.

When evaluating products, request information about security certifications, warranty options, installation support, service life, and the availability of compatible accessories. Carefully pairing the door latch type to its intended application—accounting for environmental exposure, access frequency, security needs, and code requirements—ensures optimal performance and long-term satisfaction.

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    Chapter 3: What are the different types of magnetic door latches?

    Magnetic door latches, sometimes referred to as magnetic locks or electromagnetic latches, are designed with a range of functionalities to suit residential, commercial, and industrial needs. Understanding the various types of magnetic door latches is vital for engineers, security professionals, architects, and facility managers seeking optimal access control and security solutions. Choosing the right magnetic door latch involves evaluating factors such as holding force, installation environment, access requirements, and compatibility with door materials and security systems. With a broad selection available, magnetic door latches provide reliable solutions to meet diverse architectural and operational requirements.

    Surface-Mounted Magnetic Latches

    Surface-mounted magnetic door latches are among the most widely used types of electromagnetic latches, valued for their ease of installation. These latching systems are typically installed on the header (top rail) of door frames for both single and double door openings or on the strike jamb for single doors. While their standard position is the push side of the door, they may also be set up on the pull side when project conditions require. Their versatility and straightforward mounting process make them popular in access control applications ranging from office entrances to retail environments.

    Surface Mounted Magnetic Door Latch

    Surface-mounted magnetic locks are available in varying sizes, designs, and finishes to complement different architectural styles and security demands. Most models are engineered for interior use but can be specified for outdoors with appropriate weather-resistant features. For exterior installations, regular inspection and maintenance are recommended due to environmental exposure, ensuring long-term performance. Many surface-mounted magnetic latches integrate with electronic access control systems, badge readers, and keyless entry solutions for added convenience and enhanced security management.

    Concealed-Mounted Magnetic Latches

    Concealed-mounted magnetic latches, often referred to as "shear locks," are discreetly installed within both the door and its frame, rendering them virtually invisible when the door is closed. Unlike traditional electromagnetic locks that secure with a direct-pull magnetic force, shear locks utilize a shear holding force, engaging when a pulling motion is applied in a specific direction. This unique operation delivers a sleek, flush appearance, ideal for projects where aesthetics are a priority or surface-mounted hardware would be obtrusive.

    Concealed Mounted Magnetic Door Latch

    Shear locks require careful planning regarding space and installation tolerances, since a minimum clearance is needed for proper engagement and alignment. Common installations include door frames, hollow metal or wooden doors, and sometimes even floors for pivot or specially designed doors. Like surface-mounted variants, concealed-mounted magnetic door latches can be interfaced with electronic access control systems, security alarms, and building automation for optimized security solutions in commercial, institutional, or healthcare settings.

    Fail-Secure Latches

    Fail-secure magnetic door latches, also known as fail-locked electromagnetic locks, remain locked if power is lost, requiring electrical current to disengage. In the event of a power failure or system malfunction, these latches provide robust security by preventing unauthorized access. This functionality is crucial in high-security environments, including data centers, server rooms, financial facilities, secure storage areas containing sensitive materials, and government installations, where maintaining perimeter protection is paramount.

    Fail-Secure Latches

    To facilitate emergency egress and maintain life safety, fail-secure magnetic latches can be combined with emergency exit hardware or configured with battery backup systems to ensure authorized exit if needed. Selecting a fail-secure lock is often a compliance issue for regulatory bodies concerned with both security and safety. Additionally, integrating these latches with advanced access control units, biometric authentication, or smart credential systems can further strengthen security while meeting user convenience needs.

    Fail-Safe Latches

    Fail-safe magnetic door latches release and unlock automatically when power is lost, allowing for rapid egress during emergencies. This fail-unlocked operation is especially important in buildings where occupant safety takes precedence, such as in schools, hospitals, stairwell doors, fire exits, and other areas where emergency evacuation must never be impeded. Fail-safe locks are commonly paired with fire alarm systems, building automation controls, or emergency override functions.

    Fail-Safe Locks

    While fail-safe electromagnetic locks provide optimal life safety, their security level can be enhanced by using auxiliary backup power options or integrating with redundant access systems to maintain controlled entry during outages. Consulting local building codes and fire safety regulations is essential when specifying fail-safe magnetic door latches, ensuring both safety compliance and secure access controls for all stakeholders.

    Magnetic Door Touch Latches

    Magnetic touch latches leverage a magnetized spring-loaded plunger to keep cabinet or lightweight doors closed without traditional visible hardware. When a user pushes the door, the plunger mechanism extends, releasing the latch and allowing the door to open. A subsequent push re-engages the magnet so that the door closes flush. These latches are popular in modern cabinetry, interior design, and furniture manufacturing due to their ability to deliver a minimalistic, seamless aesthetic.

    Magnetic Door Touch Latch

    Ideal for residential cabinets, wardrobes, display cases, and light-duty commercial applications, magnetic door touch latches offer quiet operation and ease of use. When selecting these latches, consider door weight, alignment, and frequency of use to ensure proper function and longevity. Available in various finishes, strengths, and styles, touch latches contribute to both accessibility and contemporary visual appeal for interior environments.

    When selecting the appropriate magnetic latch or electromagnetic lock for your project, it is important to compare features such as holding strength (measured in pounds or kilograms), durability, compatibility with your access control systems, and certification standards (such as UL Listed for fire-rated applications or ADA compliance for accessibility). Evaluating user intent—such as whether you need high-security access control, easy user egress, or aesthetically hidden latching—will help ensure a perfect alignment between product capability and building requirements. For advanced security applications, consider options with integrated monitoring sensors, smart locking technologies, or programmable keyless access to further enhance safety and system management for your facilities.

    Chapter 4: What are the applications and benefits of magnetic door latches?

    This chapter will explore the different uses and advantages of magnetic door latches.

    Applications of Magnetic Door Latches

    Magnetic door catches are ideal for lightweight doors made from materials like plywood, plastic, or certain metals that cannot accommodate or do not need a more substantial latching mechanism. They offer versatility in commercial settings, securing both interior and exterior entry points and fitting a wide range of doors. Commonly used on emergency exits, delayed-egress doors, and controlled-egress doors, magnetic catches are also employed in the automotive and construction industries. Below is a list of various applications where magnetic locks prove useful:

    • Magnetic door latches are available through automatic swing and sliding doors, as well as glass doors, single, and double doors.
    • Access-control systems are available to be used with proximity readers, credential scanners, keypads, or biometric input.
    • Fail-secure door latches guarantee doors will remain locked from entry even during power outages; egress is still available at these times.

    Benefits of Magnetic Door Latches

    The main advantages of using magnetic catches and plates are their simplicity and reliability. Unlike mechanical door catches, these specially designed latching devices are durable and require no replacements. Once properly aligned, they securely hold lightweight doors in place, eliminating the need for complex locking mechanisms or moving parts.

    Magnetic door catches are particularly well-suited for keeping doors closed in environments like kitchens, laboratories, workshops, or storage rooms due to their unique design. They operate with a straightforward pull and swing action toward the catch plate. Key benefits include:

    Remote Operation: Magnetic locks can be controlled remotely by adjusting the power source, enabling on/off functionality from a distance.

    Easy Installation: With no interconnecting components, magnetic locks are generally simpler to install compared to other types of locks.

    Quick Release: Magnetic locks (excluding fail-secure types) unlock immediately when power is cut, providing a faster release compared to traditional locks.

    Durability: Magnetic locks are often more resistant to physical tampering than conventional locks. When subjected to force, such as with a crowbar, the lock or door is less likely to sustain damage. Additionally, electromagnetic locks have no moving parts that can break down.

    Drawbacks of Magnetic Door Latches

    Magnetic door latches have their drawbacks as well. Some of these disadvantages include:

    • To be secure, most magnetic door latches must have a constant power source.
    • In the event of a power outage, security can often be deactivated.
    • They are more expensive than mechanical latches.
    • Additional hardware is required for their safe operation.

    Conclusion

    The magnetic door latch is based on the basic electromagnetic concept that the electronically charged particles in certain materials are attracted to bond to one another. A magnetic door latch is a type of latch that consists of a striking pad and a magnet and is used to keep doors and gates closed. Magnetic door latches are also known as magnetic door stops, magnetic door catches, and door magnets. Though not required, most magnets for this type of door are encased in plastic and have flanges for holes on three sides to attach the magnet to the door or the door frame. An electromagnetic lock works on the principle of using electromagnetism to lock a door when it is energized.

    To achieve optimal operation, the holding force should be collinear with the load, and the lock and armature plate should be face-to-face. Magnetic door latches are used throughout a variety of industries and for different purposes. The automotive industry, for example, relies on these devices for use in door locks, seatbelts, and with shifting and braking applications. Magnetic door latches are commonly used to close various cupboards and drawers. You most likely pass right by magnetic door latches every time you walk by your washing machine or refrigerator. Both commercial and home security systems frequently rely on magnetic door latches. There are several magnetic latch types available to meet the needs of various designs and applications and these latches differ significantly depending on their complexity and purpose. When analyzing the requirements of their specific needs, one should carefully evaluate these different types of latches.

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      Table of Contents

      Principles of Magnetic Door Latches

      Magnetic Door Latches: Design, Installation and Materials Used

      Types of Magnetic Door Latches

      Applications and Benefits of Magnetic Door Latches

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