Which joint provides strong resistance to pulling apart due to interlocking shapes?

Which joint provides strong resistance to pulling apart due to interlocking shapes?

• A. Dovetail Joint
• B. Butt Joint
• C. Mitre Joint
• D. Tongue and Groove

Answer: (A)

Resisting being pulled apart comes from a shape that locks the pieces together. A dovetail joint uses angled tails on one piece fitting into corresponding pins on the other, so when you try to pull the joint apart, the angled surfaces push against each other and the pieces are pulled tighter. The large contact area from the interlocked shapes also gives strong mechanical resistance, especially in boxes and drawers where there’s a pulling force on the front. In contrast, a butt joint relies only on glue or fasteners with no interlock, so it easily splits under tension. A mitre joint cuts corners at an angle but has no locking geometry, so it’s weak in pulling forces unless reinforced. Tongue and groove provides alignment and some resistance to movement, but it doesn’t offer the same anti-pull-out strength as the dovetail’s interlocking shape.

Resisting being pulled apart comes from a shape that locks the pieces together. A dovetail joint uses angled tails on one piece fitting into corresponding pins on the other, so when you try to pull the joint apart, the angled surfaces push against each other and the pieces are pulled tighter. The large contact area from the interlocked shapes also gives strong mechanical resistance, especially in boxes and drawers where there’s a pulling force on the front.

In contrast, a butt joint relies only on glue or fasteners with no interlock, so it easily splits under tension. A mitre joint cuts corners at an angle but has no locking geometry, so it’s weak in pulling forces unless reinforced. Tongue and groove provides alignment and some resistance to movement, but it doesn’t offer the same anti-pull-out strength as the dovetail’s interlocking shape.