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.
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