Craft · 6 pages · 12 min

Why a mortise and tenon resist pull

A peg through the tenon stops the tongue from sliding back out of the mortise.

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From the opening

A mortise is a rectangular socket cut into one timber, and a tenon is the tongue left on the end of the mating piece so it can slide into that socket. The joint resists a pull because a peg, a wedge, or both stop that tongue from backing out. The opening covers a peg crosses the tenon, drawbore pulls the shoulder tight, and a straight socket needs a pin.

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Inside

  • A peg crosses the tenon
  • Drawbore pulls the shoulder tight
  • A straight socket needs a pin
  • Short grain beyond the peg splits
  • Where the idea stops applying
  • A distinction worth keeping

Sources

  • Pegged mortise and tenon joinery
  • Drawboring a tenon to seat the shoulder