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

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

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Machine Design
A tap bolt

Has both the ends threaded
Has a head on one end and a nut fitted to the other
Has pointed threads
Has head at one end and other end fits into a tapped hole in the other part to be joined

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