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Glossary of Home/Building Structural Components

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The following terms define Building and Machine Parts

- K -

keystone: central, uppermost stone of arch.

keystone joist: joist made of reinforced concrete with sloping sides and tip wider than bottom keyway groove or slot cut in shaft or hub to hold key.

king post: vertical member between apex arid base of triangular roof framework

knob: round handle.

knuckle joint: joint permitting movement between parts in one plane only L angled support beam, brace, or bracket.