Correct Answer - Option 3 : 28 mm
Concept
As per IS 800-1984 clause 3.6.1.1,
In making a deduction for rivets less than or equal to 25 mm in diameter, the diameter of the hole shall be assumed to be 1.5 mm in excess of the nominal diameter of the rivet unless specified otherwise.
If the diameter of the rivet is greater than 25 mm, the diameter of the hole shall be assumed to be 2.0 mm in excess of the nominal diameter of the rivet unless specified otherwise.
Dia of holes in case of:
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Rivet
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Bolt
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Upto 25mm diameter rivet:
Hole diameter = d + 1.5 mm
For rivet diameter > 25mm
Hole diameter = d + 2mm
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Bolt dia
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(12 - 14) mm
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(16 - 24) mm
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>24 mm
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Hole dia
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Bolt dia + 1 mm
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Bolt dia + 2 mm
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Bolt dia + 3 mm
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Here, Diameter of bolt is 25 mm
So, Hole diameter = 25 + 3 = 28 mm
