Mechanical Engineering - Machine Design - Discussion

The number of bolts in a flange coupling depends on several factors, including the size of the bolts, the load on the coupling, and the required safety factor. However, there are some general guidelines that can be used to determine the number of bolts for a given shaft diameter.

One commonly used guideline is to use one bolt for every 25 mm of shaft diameter.

Using this guideline, we can calculate the number of bolts required for a shaft diameter of 100 mm as follows:

Number of bolts = (Shaft diameter)/25 mm per bolt
Number of bolts = 100 mm/25 mm per bolt
The number of bolts = 4 bolts.

I think the correct answer is 6.

Flange coupling:

Shaft dia mm ------- No. Of. Bolts.
Up-to 40 ------- 3.
40-60 ------- 4.
60-180 ------- 6.
Above 180 ------- 8.

Here is flange coupling, not marine flange coupling so the answer is right.

@Ankit -
This is for marine.

@Vinay bel.
This is for the flange.

3 for d upto 40 mm,
4 for d upto 100 mm,
6 for d upto 180 mm,
So, The right answer is 4.

Yes, your are right, Thanks @Ankit.

6 is the right answer.

35 to 55 - 4.
56 to 150 - 6.
151 to 230 - 8.
230 to 390 - 10.
Above 390 - 12.

Ref : RS Khurmi.

3 for d upto 40 mm,
4 for d upto 100 mm,
6 for d upto 180 mm,
So, The right answer is 4.

Here, n= ((4/150)*d) + 3.

For, 35 mm diameter shaft n = 3.
55 mm diameter shaft n = 4.
150 mm diameter shaft n = 6.
230 mm diameter shaft n = 8.