Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

The effect of curvature of the cylinder wall is neglected
The tensile stresses are uniformly distributed over the section of the walls
All of these
The effect of the restraining action of the heads at the end of the pressure vessel is neglected

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Machine Design
The designation M 33 × 2 of a bolt means

Metric threads of 33 mm outside diameter and 2 mm pitch
Bolt of 33 mm nominal diameter having 2 threads per cm
Metric threads of 33 numbers in 2 cm
Metric threads with cross-section of 33 mm

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