What is the difference between a through mortise and a passage mortise?
In the realm of door hardware, understanding the nuances between different types of mortises is crucial for making informed decisions. As a supplier of Passage Mortises, I am often asked about the differences between through mortises and passage mortises. In this blog post, I will delve into the characteristics, applications, and distinctions of these two types of mortises.
Understanding Mortises
Before we explore the differences, let's first understand what a mortise is. A mortise is a cavity or recess that is cut into a door to accommodate a lock or other hardware. This design allows for a more secure and aesthetically pleasing installation compared to surface-mounted locks. Mortises come in various shapes and sizes, tailored to different types of locks and door applications.
Through Mortise
A through mortise, as the name suggests, is a mortise that goes all the way through the door. This type of mortise is typically used for heavy - duty locks and is common in commercial and high - security applications.
Construction and Design
Through mortises are usually deeper and wider than passage mortises. They are designed to hold large and complex lock mechanisms that require a significant amount of space. The lock is installed within the mortise, and the components on the inside and outside of the door are connected through the passage created by the through mortise. This design provides a high level of security as the lock is well - protected within the door.
Security Features
Due to their construction, through mortises are often associated with high - security locks. They can accommodate deadbolts, multiple locking points, and other advanced security features. For example, in a commercial building, a through mortise lock can be used to secure entrances, exits, and sensitive areas. The robust construction of the through mortise makes it more resistant to forced entry compared to other types of mortises.
Applications
Through mortises are commonly found in commercial buildings such as offices, banks, and government facilities. They are also used in high - end residential properties where security is a top priority. In addition, through mortises are suitable for exterior doors that are exposed to the elements and potential intruders.
Passage Mortise
As a supplier of Passage Mortises, I can attest to their unique features and applications. A passage mortise is a type of mortise that is used for non - locking or privacy applications.
Construction and Design
Passage mortises are generally shallower and narrower than through mortises. They are designed to hold simpler lock mechanisms, such as passage locks or privacy locks. Passage locks are used in areas where there is no need for locking, such as closets, hallways, and interior doors. Privacy locks, on the other hand, are used in areas where privacy is required, such as bathrooms and bedrooms.
Functionality
The main function of a passage mortise is to allow for the smooth operation of the door. Passage locks typically have a simple latch mechanism that can be easily opened from both sides of the door. Privacy locks have a locking mechanism that can be engaged from the inside, usually by turning a knob or a button.
Applications
Passage mortises are commonly used in residential and commercial interior doors. They are ideal for areas where security is not a major concern but functionality and aesthetics are important. For example, in a hotel, passage mortises can be used for guest room doors, closet doors, and bathroom doors.


Key Differences
Now that we have a better understanding of through mortises and passage mortises, let's highlight the key differences between them.
Security Level
The most significant difference between through mortises and passage mortises is the security level. Through mortises are designed for high - security applications and can accommodate complex locking mechanisms. Passage mortises, on the other hand, are used for non - locking or privacy applications and have a lower security level.
Size and Depth
Through mortises are larger and deeper than passage mortises. This is because they need to accommodate larger lock components and provide a secure connection between the inside and outside of the door. Passage mortises are smaller and shallower, as they are designed for simpler lock mechanisms.
Application Areas
Through mortises are mainly used in commercial and high - security exterior doors. Passage mortises are commonly used in residential and commercial interior doors.
Our Product Range
As a passage mortise supplier, we offer a wide range of products to meet different customer needs. Our product range includes Fire-rated Latch Mortise, which is designed to provide fire protection in addition to normal locking functionality. This type of mortise is suitable for commercial buildings where fire safety is a concern.
We also have the European Commercial Night Latch Door Lock, which is a popular choice for commercial and residential applications. This lock offers a high level of security and durability, and it is easy to install and operate.
Another product in our range is the Escape Mortise Lock. This lock is designed to provide a quick and easy escape in case of an emergency. It is commonly used in public buildings, such as schools, hospitals, and theaters.
Conclusion
In conclusion, through mortises and passage mortises have distinct characteristics and applications. Through mortises are designed for high - security applications, while passage mortises are used for non - locking or privacy applications. As a passage mortise supplier, we are committed to providing high - quality products that meet the needs of our customers. Whether you are looking for a lock for your home or a commercial building, we have the right solution for you.
If you are interested in our passage mortise products or have any questions about the differences between through mortises and passage mortises, please feel free to contact us for a detailed discussion and procurement negotiation. We look forward to serving you and helping you find the perfect door hardware solution.
References
- "Door Hardware Handbook" by the Door and Hardware Institute
- "Security Locks and Systems" by the American Society for Industrial Security
