What will be the diameter of the standard size bolt hole, as per IS 800 : 2007, if the nominal diameter of the bolt is 24 mm?
26 mm
Bolt Hole Diameter as per IS 800:2007
When designing steel structures, it is important to specify the correct size for bolt holes. As per the Indian Standard code IS 800:2007 (General construction in Steel - Code of Practice), standard bolt holes are made slightly larger than the nominal diameter of the bolt. This difference is called clearance.
The standard clearance provided in the bolt hole allows for ease of bolt insertion and accounts for minor misalignments during assembly. IS 800:2007 specifies the standard clearance for different nominal bolt diameters. For black bolts and ordinary bolts, the standard clearance depends on the nominal diameter of the bolt.
Standard Clearance for Bolt Holes
According to IS 800:2007, the standard clearance added to the nominal bolt diameter to get the standard bolt hole diameter is as follows:
| Nominal Diameter of Bolt ($\phi$ in mm) | Standard Clearance (mm) |
|---|---|
| $\phi < 16$ | 1 |
| $16 \le \phi \le 24$ | 2 |
| $\phi > 24$ | 3 |
Calculating Standard Bolt Hole Diameter
The question asks for the diameter of the standard size bolt hole for a nominal bolt diameter of 24 mm.
The formula to calculate the standard bolt hole diameter is:
Standard Bolt Hole Diameter = Nominal Bolt Diameter + Standard Clearance
Given:
- Nominal Diameter of Bolt = 24 mm
From the table above, for a nominal bolt diameter of 24 mm, which falls in the range $16 \le \phi \le 24$, the standard clearance is 2 mm.
Therefore,
Standard Bolt Hole Diameter = 24 mm + 2 mm
Standard Bolt Hole Diameter = 26 mm
Thus, as per IS 800:2007, the standard size bolt hole for a 24 mm nominal diameter bolt is 26 mm.
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