When it comes to Door Hardware, one of the most common questions asked by builders, designers, and homeowners alike is: are all Mortise Locks the same size? The short answer is no — mortise locks come in a variety of sizes and configurations to fit different doors, materials, and security needs. Choosing the right size is essential to ensure smooth installation, reliable performance, and long-term durability.
As a professional B2B mortise lock manufacturer, we design and produce a wide range of customized mortise lock systems for hotels, offices, residential buildings, and architectural projects worldwide. This article will explain why mortise locks are not one-size-fits-all, what dimensions matter most, and how our precision-engineered products ensure compatibility, safety, and superior function for every application.
A mortise lock is a locking mechanism installed into a pocket (or mortise) cut into the edge of the door. Unlike cylindrical locks that sit on the surface, mortise locks are embedded inside the door, providing a stronger structure, enhanced security, and a clean appearance.
| Part | Description |
|---|---|
| Lock Body | The internal mechanism installed inside the door. |
| Faceplate | The visible metal plate fitted along the door edge. |
| Strike Plate | Mounted on the door frame to receive the latch or bolt. |
| Latch and Deadbolt | Engage to lock and secure the door. |
| Handle or Lever | Used to operate the latch. |
| Cylinder | Contains the key mechanism controlling the lock. |
Because door thickness, width, and design vary across regions and industries, mortise locks must be sized accordingly to ensure proper alignment and function.
Mortise locks are not all the same size. They differ in dimensions, backset, faceplate size, and depth to match various door types and architectural standards.
A lock designed for a wooden interior door will differ greatly from one built for a metal security or hotel room door. Using the wrong size can lead to misalignment, operational failure, or even structural damage to the door.
| Measurement | Description | Common Range |
|---|---|---|
| Backset | Distance from the door edge to the center of the keyhole or handle. | 45mm, 55mm, 60mm, 70mm |
| Case Depth | How deep the lock body extends into the door. | 60mm–100mm |
| Faceplate Length & Width | Size of the visible metal plate along the edge. | 200mm × 25mm to 240mm × 30mm |
| Door Thickness Compatibility | The door’s width must accommodate the lock body. | 35mm–70mm |
| Center Distance | Distance between handle spindle and cylinder keyhole. | 72mm, 85mm, 92mm (common European sizes) |
These differences depend on regional standards (European, American, or Asian), door material, and security requirements.
| Application | Typical Backset | Door Type | Features |
|---|---|---|---|
| Residential Interior Door | 45mm–55mm | Wooden | Standard latch function with privacy option |
| Main Entrance Door | 60mm–70mm | Solid wood / steel | Includes deadbolt for enhanced security |
| Commercial Office Door | 55mm–70mm | Metal or composite | High durability and frequent usage |
| Hotel Door Lock System | 60mm–70mm | Fire-rated wooden doors | Compatible with electronic access systems |
| Glass or Aluminum Door | 35mm–45mm | Slim profile | Compact mortise lock case design |
Our factory offers custom mortise lock sizing, allowing B2B partners to match specific door designs or regional standards without compatibility issues.
Different doors require different lock body depths and plate shapes. For instance:
Wooden doors can accommodate deeper mortise bodies.
Aluminum and glass doors require compact, narrow mortise designs.
Metal security doors need reinforced lock cases for stability.
Our R&D team develops specialized lock series for each of these applications, ensuring both precise fit and consistent performance.
A lock’s deadbolt size, latch strength, and cylinder length may vary depending on the level of security required.
For example:
Commercial doors demand thicker lock bodies and multi-point locking systems.
Interior doors prioritize smooth operation and aesthetic appeal.
We manufacture locks that meet both ISO and EN standards, offering mechanical and electronic models for every security tier.
Mortise lock sizes are also influenced by national or regional door standards:
European standard mortise locks often use 72mm or 85mm center distances.
American standard mortise locks typically have 2-3/4" (70mm) backsets.
Asian market locks may follow compact or custom dimensions for narrow-profile doors.
As a global B2B manufacturer, we supply locks compliant with European CE, American ANSI/BHMA, and Chinese GB standards, ensuring worldwide compatibility.
Choosing the correct size is essential for both performance and appearance. Here’s how professionals approach it:
Measure from the door’s edge to the center of the keyhole or spindle. The most common sizes are 45mm, 55mm, or 70mm, depending on door width.
Ensure your door’s thickness can accommodate the lock body. A thicker door allows for deeper mortise locks.
The faceplate should align flush with the door edge for a clean, professional finish.
The center distance between the handle spindle and keyhole (e.g., 72mm, 85mm, or 92mm) must match your handle design.
Select a lock type suited to its purpose:
Passage locks for hallways and interiors.
Privacy locks for bathrooms.
Entrance locks with deadbolts for main doors.
Electronic mortise locks for hotels and offices.
Our product catalog offers all these configurations, with customizable sizes and finishes to fit your project specifications.
As a leading B2B mortise lock manufacturer, we focus on combining functionality, precision, and modern design to meet international demand for premium door hardware.
Our locks are made using CNC machining and automated assembly lines to ensure consistent dimensions and flawless internal mechanisms. Every lock undergoes cycle testing over 100,000 operations to guarantee long-term reliability.
We provide OEM and ODM services for global clients, including:
Customized lock sizes and dimensions
Brand laser engraving and packaging design
Finish options such as stainless steel, matte black, satin nickel, or PVD gold
Compatibility with electronic or mechanical systems
We use SUS304/SUS316 stainless steel, brass, and zinc alloy components for superior corrosion resistance, strength, and aesthetic value. Each material is tested for durability under humid, coastal, and high-use conditions.
Our locks are certified to EN12209, ANSI/BHMA, and ISO9001 standards, ensuring compatibility with major international door systems. This makes our products ideal for hotel chains, building contractors, and architectural projects seeking long-term partnerships.
To sum up, mortise locks are not universal in size — their dimensions vary according to door design, standard requirements, and intended use. Choosing the correct size ensures secure installation, better functionality, and a sleek, professional appearance.
At our factory, we specialize in manufacturing custom-sized mortise locks that meet both architectural standards and client-specific requirements. By integrating advanced production, strict quality control, and OEM flexibility, we deliver solutions trusted by builders, distributors, and hospitality brands worldwide.
If you’re sourcing high-quality mortise locks for your next project, we provide the expertise, customization, and reliability that make every installation seamless and secure.
