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

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

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Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
None of these
Keeping the core diameter smaller than the diameter of the unthreaded portion

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