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What makes a tenon “haunched”?
A standard tenon has shoulders around its cheeks. In a haunched tenon, part of one shoulder is removed, leaving a short projection—the haunch—that fits into a matching recess at the end of the mortise. The joint retains a broad tenon cheek while leaving more material near the end of the stile than an overly wide tenon might.
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The haunch can help a tenoned rail resist twisting and adds glue surface, according to Woodcraft Magazine and WOOD Magazine. In frame-and-panel work, it can also fill the area where a panel groove reaches the stile, allowing the groove to run continuously rather than stopping around a conventional tenon.
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Paneled doors and rail-and-stile frames
Consider one when the panel groove runs into the joint and the haunch can cover its exposed end. This makes the haunch useful for layout as well as for the joint itself. Fine Woodworking and Woodcraft Magazine describe this role in frame-and-panel construction.
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Large or heavy doors
On a larger door, twisting and racking forces can make the additional cheek width and resistance to twist valuable. WOOD Magazine recommends haunched mortise-and-tenon joints for larger door frames, while noting that a simpler joint can work for light frames.
Frequently stressed rails
Chair and table rails that experience repeated stress are other candidates. Practical woodworking guidance also includes table legs and rails among applications for haunched joints; see Popular Woodworking.
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When is a simpler joint enough?
A haunch is not necessary for every frame. For a small cabinet door or another light frame, WOOD Magazine says a stub-tenon-and-groove joint can be sufficiently strong. If the frame has little expected twisting stress and does not need a continuous panel groove, the simpler joint may avoid extra layout and fitting without sacrificing a needed function.
How to choose between the two
| Consideration | Haunched mortise-and-tenon | Stub-tenon-and-groove |
|---|---|---|
| Expected twisting or racking stress | Useful where added twist resistance is wanted, such as larger doors or stressed rails. | May suit light frames with modest stress. |
| Panel-groove layout | The haunch can cover the groove end and permit a continuous groove in the stile. | May require a different groove or tenon layout. |
| Stile-end material | Can retain material near the stile end while preserving a broad tenon cheek. | Depends on the particular joint layout. |
| Glue area | Provides additional glue surface, as described by Woodcraft Magazine and WOOD Magazine. | Comparative glue area is not stated by those sources. |
| Layout and fitting effort | Requires a matching haunch recess and careful fitting. | Simpler to lay out and cut. |
The available woodworking sources give qualitative guidance, not controlled comparative strength measurements. They do not establish a numeric strength increase for a haunched joint.
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Design and fitting considerations
- Keep enough material at the stile end. A wider tenon can improve resistance to twist, but taking too much material from the stile end can leave a weak or breakout-prone area. A haunch can help preserve material there while keeping a broad cheek.
- Size the joint for the stock and layout. WOOD Magazine mentions a “rule of thirds” approach, but the available source does not provide enough detail to treat it as a universal dimension. Choose proportions based on the actual stock and joint geometry.
- Make the matching recess accurately. The haunch must fit its recess and must not prevent the shoulders from closing fully. Kreg notes that the haunched form takes more layout and cutting effort than a plain joint: Kreg Tool.
- Match the method to your tools. One described approach uses router-table work for the groove and a narrow chisel to chop the mortise. A mortise chisel is one possible tool for that hand-cut method, not a requirement for every build.
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