Machine Design
In worm, gears, pitch lead angle is

Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and an element of the cylinder
The angle between the tangent to the pitch helix and the plane of rotation
None of these

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

Metric threads with cross-section of 33 mm
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

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