What Is A Mortise and Tenon Joint And What's It Used For?
When purchasing quality, traditionally made wooden products, you’ll likely come across a ‘mortise and tenon’ joint.
Praised for its great strength, the mortise and tenon joint is a premier joinery technique for furniture making and woodwork.
This popular, durable, joint has actually been used for centuries, with the earliest mortise-and-tenon dating back 7000 years to the Hemudu culture in China’s Zhejiang Province, and other notable uses including in the Notre Dame Cathedral in Paris.
Today, the mortise and tenon joint is a cornerstone of fine woodworking and traditional hand-crafting. Robust and elegant, a mortise and tenon joint can elevate a product to new heights of quality and durability.
As leading specialists in custom-made wooden products, our family-run business has been hand-crafting garden products since 2016, such as garden gates, garage doors, driveway gates, summer houses, and sheds, all with traditional techniques and expert carpentry skills.
What Is A Mortise and Tenon Joint?
A mortise and tenon joint is simple, yet incredibly effective. It connects two pieces of wood at an angle, consisting of two primary pieces; the mortise and the tenon.
The Mortise
Mortises are best visualised as a socket, recess or hole cut into a piece of timber, used to connect the tenon. This opening is typically rectangular in shape, however this will vary depending on the joint design and application. This mortise will have clean, straight sides, a flat bottom and consistent depth.
The Tenon
The tenon is the protruding part that fits into the mortise. Typically cut at the end of a board or rail, to fit snugly into the mortise, the tenon will be cut into a piece of timber, referred to as the ‘inserting piece’. A tenon will have straight, parallel sides, flat shoulders, thickness for a tight fit without splitting the mortise and length appropriate to the mortise’ depth.
How Does A Mortise and Tenon Joint Work?
A mortise and tenon joint works by inserting the tenon into the mortise, creating a strong joint that is resistant to pulling and twisting forces.
Whilst straightforward, a mortise and tenon creates a strong fastening between the two pieces of wood. The strength of this joint is due to several factors:
Surface Area
There is a large surface area between the tenon and the inside of the mortise that allows for ample space for gluing.
Mechanical Interlock
The tenon will physically prevent the joint from pulling apart and twisting.
End Grain To Long Grain Connection
The end grain of the tenon contacts the long grain inside the mortise, which is another way to create a strong glue bond.
Historically, many mortise and tenon joints were unglued, especially when used in large timber-frame constructions, however in modern woodworking, the joint will be glued for maximum strength.
Where Are Mortise and Tenon Joints Typically Used Today?
Modern construction often uses mortise and tenon joints. They’re commonly found in furniture, doors, windows and different wood components.
What Are The Various Types of Mortise and Tenon Joints?
There are four main types of mortise and tenon joints;
Blind Joint
A blind joint, or hidden joint, is formed as the mortise does not pass all the way through, creating a pocket for the tenon to rest in, concealing the end grain of the tenon.
Through Joint
Also known as an open joint, a through joint is a mortise that passes all the way through and the tenon ends flush with the far end of the mortise.
Wedged Tenon
In a wedged tenon, the wedges add strength by widening the tenon end to extend through the mortise to create a dovetail. The outside of the mortise is then flared to match the dovetail shape, creating a wedged tenon.
Tusked Tenon
A tusked tenon is where a tenon extends past the end of the mortise to accept a wedge or pin.
What Are The Advantages Of A Mortise and Tenon Joint?
Classic Aesthetic
When built from traditional materials such as timber, mortise and tenon joints are a great way to add a traditional, stunning aesthetic appeal to a project. They look beautiful in any building style, whether that’s traditional or modern, they look excellent in a range of construction projects, from furniture to full architectural structures.
Durability
Mortise and tenon joints are durable, because their components are more settled and sturdier.
No Visible Cracks or Gaps
When professionally created, a mortise and tenon joint will not have visible gaps or cracks, preventing damage over time and keeping cold air out.
Strength
Mortise and tenon joints are some of the toughest joints you will find. With a flush-fitting design, they are incredibly difficult to pull apart once put together.
Water Resistance
With the right sealant, a mortise and tenon joint has the capabilities to be water-tight. This makes them ideal for structures that typically face the elements, including garage doors and driveway gates.
Repairability
Unlike other modern joinery techniques, mortise and tenon joints can be repaired in the rare time they loosen and fail.
How We Make Mortise and Tenon Joints
At Juke’s Timber Solutions, we create our wooden products with state-of-the-art machinery in our custom-built facility. We will ensure that every piece fits together perfectly, allowing for a clean finish with classic beauty.
Watch below, as our team create a mortise and tenon joint;
If you’d like to find out more, feel free to get in touch with our team and let us help you design the right wooden product for your property. We deliver expert craftsmanship and premium, sustainable materials for year-round resilience.