Meet The Adjustable Mortise Jig & Tenon System™ by Philip Miller Furniture

After venturing into home DIY projects and making furniture for my home, I became frustrated with the high prices of tools and current methods for joining objects together, specifically table legs to table tops. I set my sights on reinventing the complex and difficult method of creating mortise and tenon joints. 

My passion to reinvent the standard and traditional way of making mortise and tenon joints has taken me over two years. I began with ideation, prototyping, testing and iterating on my idea and am now ready to bring the Adjustable Mortise Jig and Tenon Fastener System™ to DIYers, Woodworkers and Furniture Makers.

The Adjustable Mortise Jig™ creates a shallow mortise to attach a uniquely designed Adaptable Tenon Fastener™. It is packed with features that help you create repeatable precision mortises every-time. Check out the video to see how it works.

You can use the adjustable mortis jig and system for attaching 4 wood legs at each corner of a table by using the uniquely designed tenons and adjustable mortise jig. The tenons attached to the top of the table leg and then to the underside of the table.

White Oak Dining Table With Edge Table Legs

A few key features in the design include:

• Recessed plate into underside of table.
• Offset plate on table leg so plate is not visible once attached.
• Micro adjustable fastener to fine tune the placement of the steel tenon.

The Adjustable Mortise Jig™

The Adjustable Mortise Jig™ creates a shallow mortise and it is packed with features that help you create repeatable precision mortises every-time. This jig works with a standard plunge router that most of us already have in our wood shops. The adjustable mortise jig is designed to work with 1/4″ or 1/8″ template router bits and is made up of two components. The top mounting member sits on top of the bottom indexing member. The top mounting member has holes that allow you to temporarily attach the jig to the surface of your object. The bottom indexing member has two features. The first feature is the indexing tab, this allows you to set your jig on the very edge or corner of an object. Second features are the alignment tabs, these help keep the jig properly aligned to the surface you are creating your mortise.

The version of this mortise jig can adjust up to three different sizes. This allows you to create mortise sizes that are 4″x4″, 5″x5″, and 6″x6″. These sizes are designed to work with the steel plate tenon fasteners and different table leg sizes and configurations. Let’s take a look at the tenon fasteners.

Adjustable Mortise and Tenon Router Jig and Fastener System™

The Adaptable Tenon Fastener™

The Adaptable Tenon Fastener™ is designed to fit within the shallow mortise created by the Adjustable Mortise Jig™. Each tenon fastener is designed to work with different sized table legs. The 1/4in tenon fasteners have a micro adjustment holes giving you the ability make micro adjustments to the XY location of the tenon fastener. The 1/8in fastener tenons do not have the micro adjustment holes and are designed for lighter-weight applications.

matte black tenon fastener™ inset into a table top and table leg

Each tenon fastener can accommodate different leg sizes. Each plate is optimal for specific applications or builds. The 4×4 plate is best used for small end or side tables and accepts #8 or #10 screws. The 5×5 is best used for coffee tables, sofa tables, console tables and accepts #8 or #10 screws. The 6×6 plate is best used for kitchen or dinning tables and conference tables and accepts #10 or #12 screws.

Adjustable Mortis Jig & Tenon Fastener System™

The Adjustable Mortise Jig Kit

The Adjustable Mortise Jig Kit includes Custom Case, Self-Centering Bit, Template Bit, Adjustable Mortise Jig™ and 4 Tenon Fasteners™ (size of tenon fastener plates vary based on the kit selection) This kit is a great way to get started as it comes with everything you need including the bits and tools you need to start building.

adjustable mortise jig blue in a black foam case

How It Works

Creating mortise and tenon joints is nothing new however, our system and method of creating these types of joints is unique and different. We have expanded and simplified this joinery method. Our system creates a shallow mortise and tenon joint using a uniquely designed adjustable mortise jig and tenon fastener that can be attached to any surface. Creating mortise and tenon joints should be simple, fast, and make your life easier. This new method of joinery will allow you to make new products that were once out of reach or impossible. The Adjustable Mortise Jig & Tenon System™ is designed to work with small and large projects, ranging from side tables to conference tables. The possibilities are endless!

Micro Adjustment Feature

The micro adjustment feature is only available on the 1/4″ Adaptable Tenon Fastener™. This feature allows you to make micro adjustments to the x and y position of your table leg. This gives you the ability to fine tune the position of the table leg to account for any variance that may occur with your build.

adjustable mortise tenon fastener attached to a table leg

The Benefits

This is a new process and method for anyone to create, build and assemble mortise and tenons joints. This method does not require any traditional training in woodworking. We have simplified the process for creating and applying shallow mortise and tenons to objects, making this type of joint accessible to everyone no matter their skill level. Here is a list of some of the benefits.

Saves Time

Create a mortise and tenon joint in a matter of minutes vs. hours. Gives you time back to your day.

Easy to use

Novice to Expert. There is no guess work. We take care of the precision so you don’t have to.


Quickly and accurately create a mortise and tenon joint using basic every day shop tools.

Innovative idea

Adjustable, accurate, perfect every time and you don’t have to be an experienced woodworker to create mortise and tenon joints.

New products

Allows you to create and build new products for your customers. Increases your revenue and market reach.

Made in USA

Everything is manufactured, made and assembled right here in the USA.

Share Your Thoughts and Back The Project

Let me know what you think, post a comment below or share with your friends. My goal is to help you make great things. – Philip