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The tusk tenon is a useful joint to choose when you need to connect horizontal timbers (such as in a floor layout) without weakening either beam too much. The tenon extends from some point up from the bottom surface, usually at the central or neutral axis of the beam into which it will locate.
Castle Ring Oak Frame tusk tenonsThis is all about preserving continuous beam fibres at the top and bottom of the morticed beam. What does “continuous beam fibres” mean? It means your house won’t fall down!The upper shoulder is cut at an angle to increase the strength or “shearing” area of the tenon, along with a “step” below the tenon for the same reason.

Castle Ring Oak Frame timber frame tenon

The great thing is that once the joint is assembled you’ve no idea it’s there.

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Castlering Wood, Beggars Bush, Evenjobb, Powys, LD8 2PB