General Tools

Model # 870

Internet # 203219283

Mortise and Tenon Jig

$93.42 /each
  • All-in-one solution to quickly cut a matching mortise and Tenon
  • Can be mounted directly to a workbench or clamped in a vise
  • Can cut ultiple mortises in a single long piece

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Product Overview

General Tools has grown to become the recognized industry leader for specialty hand tools and instruments. This trailblazing tool provides a quick and easy, all-in-1 solution to cut both a matching mortise and Tenon with a single inexpensive jig. The Mortise and Tenon Jig is ready to use right out-of-the-box to produce 1/4 in. mortise and Tenon joints for cabinets, furniture and frames. Included are the bushings for also producing 3/8 in. and 1/2 in. joints. Using a plunge router with the jig, woodworkers can cut fully aligned mortises and tenons ranging from 1/4 in. to 1/2 in. wide and from 1 in. to 3 in. long. The unit can be mounted directly on a workbench or onto a board that can be clamped in a vise or to a bench. The Mortise & Tenon Joint has been used for thousands of years, but not until now did someone figure out a way to provide a quick and easy, all-in-1 solution to cut both a matching mortise and Tenon with a single inexpensive jig. The unit can easily handle stock ranging from 1/2 in. to 1-1/2 in. thick and can cut multiple mortises in a single long piece.

California residents: see  Proposition 65 information

  • Accommodates stock from 1/2 in. to 11/2 in. thick and any length
  • Mortise and tenon thickness: 1/4 in., 3/8 in. and 1/2 in.
  • Quick change router base bushing assembly consists of the following:
  • 1-quick change 1-3/16 in. guide sleeve and locking nut
  • 1-1/4 in. guide bushing (1-1/4 in. O.D.)
  • 1-1/4 in. shank centering pin
  • 1-flat spanner wrench for guide sleeve locking nut adjustment
  • 1-3/8 in. guide bushing
  • 1-1/2 in. guide bushing
  • Kit also includes one 1/4 in. straight up cut spiral carbide router bit and an alignment tool

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 


Hand Tool Type 
Primary Use 
Creating Mortise & Tenon Jigs 
Tools Product Type 
Hand Tool 

Warranty / Certifications

Manufacturer Warranty 
1 Year 

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Customer Questions & Answers

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Customer Questions & Answers

Mortise and Tenon Jig
Mortise and Tenon Jig

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what is the product made of?

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Portland, OR
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December 1, 2015
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February 1, 2016
Jig body made of solid 6063 grade aircraft grade aluminum
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January 6, 2016
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does one port make the mortise and the other port make the tenon.can boards go in in any direction

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Sacramento, United States (SAC)
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February 7, 2016
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Customer Reviews

Rated 2.9 out of 5 by 10 reviewers.
Rated 2.0 out of 5.0 by Not what I expected This product is good but i question the time savings using it. Requires a lot of set-up's before you can use it. The instructions are not as easy to follow as they could be. April 6, 2016
Rated 1.0 out of 5.0 by Very finicky to adjust I thought it was just me but after trying about 10 times with different configurations, I finally can say that it's very difficult to be repeatable and accurate with this jig. If you clamp a hair out of line, which is difficult to say on the jig you only know when you dry fit, you are gonna be out of alignment..... I would not use this on expensive wood.... In fact, I would not use it at all. February 10, 2016
Rated 5.0 out of 5.0 by Milling Mortise & Tenons Never Easier The General Tool's 870 Mortise and Tenon Jig provides anyone with a plunge router an accurate way to make crisp fitting mortise cuts and tenon wood joins. The jig handles 1/4 inch to 1 1/2 inch thickness stock. This tool can create mortises from 1 inch to 3 inches wide. The jig is made of heavy duty aluminum construction with an automatic centering feature. This General product manufactures both the tenon and mortise in one tool. The jig is not available in the store but I ordered online with the help of in-store staff. Home Depot shipped the tool directly to my home. March 16, 2013
Rated 4.0 out of 5.0 by Tought to center work Bought this because of all the M & T I need to do on my grandfather clock. Mounted it to my bench temporarily. This tool is useable, however it is tough to center the work piece for either tenoning or mortising. It took several tries to learn how to get the center alignments setup. (The alignment bars on this version are made of metal not plastic.) It works and after some trial and error, which I would do with any new tool, I'm sure I'll be happy with the purchase. May 14, 2013
Rated 5.0 out of 5.0 by Mortise and tenon jig The mortise and tenon jig works perfect. I found it pretty easy to set up if you have any woodworking knowledge at all. It is fairly simple. July 4, 2015
Rated 3.0 out of 5.0 by Effective, but with limitations. Mortise depth and tenon length limited to around 1.25 inch making a through mortise on a 1.5 inch leg difficult. You must route from both sides making setup awkward. Mortise on 1.5 inch stock difficult because of limited clamping surface. (Spacers required to ensure 1.5 inch stock is within reach of the built-in clamps again limiting the reach of the router bit) Consistent mortise and tenons on several alike pieces difficult because of the amount of interpolation required. However, consistency is attainable with practice. Pieces can be re-inserted within the fixture to correct errors after becoming more familiar with the various features. December 25, 2012
Rated 3.0 out of 5.0 by Fair product, but could use some improvements. This jig was easy to set up and use if you follow the directions, but it could definitely use some improvements. The plastic top guides should be metal. They are a bit sloppy and I don't see them holding up to heavy use. Also, the clamping does not square up pieces easily. Take great care making sure your stock is completely where you want it in the jig. It is very easy to be off by 1/16th of an inch from one end of the mortise or tenon and really screw up the joint. I see myself making quite a few jigs to hold wood in this jig, making sure I have a repeatable cut. Other than that, my first project I did with this jig was a pretty big success. I couldn't have done all the joints without something way more expensive than this. January 29, 2013
Rated 4.0 out of 5.0 by Cool little jointer Jig My brother and I wanted to learn how to cut mortise and tenons for a repair job on our family kitchen table. We did a lot of research to find the right tool that we could also share, but all the jigs we looked at were big and costly. We finally settled on General’s Mortise and Tenon Jig because of the price and its size. We spent some time following the manual and watching the video and eventually figured out how to do the set-up and cut the mortises and the tenons with good results. The knobbed screws, used to tighten the jig to the stock are kind of small but they held the stock steady during routing anyway. The jig came with all the stuff we needed, including a very helpful centering device for aligning the router base with the router collet. All in all, once we got the hang of it, we were able to create the needed mortises and tenons for our table repair project. General’s little jig worked great for us and we would recommend it to anyone. May 4, 2012
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