Know the name of this joint?

[Andrew W. Thomas]

I recall seeing this joint on The Woodsmith Shop a while back but cannot think of the name of it. Also, I am considering using it to hold the sides to the back of a toy box I'm building my son. Seems to provide a lot of glue surface and I was favoring it over the half lap. Any thoughts or experience with the joint?
joint.JPG

[JohnT Fitzgerald]

I've seen it called a lock joint, or a lock rabbet. It's a very strong joint, especially when when piece will be pulled a lot (for instance, the front of a drawer).

[Shawn Pixley]

Lock rabbet is what I've always heard.

[glenn bradley]

Drawer-lock is another common name. It is my go-to joint for drawers.

[Steve Baumgartner]

As the others have said, it is a lock rabbet. It is almost as easy to cut as a plain rabbet, but much stronger. It's main limitation is that the L-shaped tongue on the side board is all short grain, which makes it vulnerable to splitting off (the tongue on the front/back is long grain and pretty strong). It's used a lot in mid-grade drawers (high end are usually dovetailed). For a toy box, I'd be a bit concerned that a typical kid will subject it to more abuse than a drawer, but of course, the expected lifetime of a toy box may be shorter than a kitchen drawer.

[Andrew W. Thomas]

Steve, thats my worry. I hope that this is around as long as he is (he's only 14months old). I plan to hand cut dovetails where the front joins the sides. I'm not confident enough in my abilities to do the back with dovetails also (doubling the amount I have to cut). Practice makes perfect i suppose though.

[eugene earl king]

go to rockler page you will see the router bit that cuts that profile and its name. can not rember it at this time.. but has large surface area for glue up...