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______________ is a form of a solid head where the threads are provided on which a nut moves.

(a) Nail

(b) Nut

(c) Connector

(d) Bolt

I had been asked this question in exam.

My question comes from Carpentry and Joinery topic in section Fire Protection in Building, Carpentry and Joinery of Construction & Building Materials

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The correct choice is (d) Bolt

For explanation: The size of bolts should be calculated according to the stresses which they have to resist. The bolts maybe of Steel, wrought iron on bras and they are stronger than Nails or screws. They are used especially for joint subjected to considerable tensile stress and they form the rigid joints.

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