Machine Design
The root angle of a bevel gear is equal to

Pitch angle - addendum angle
Pitch angle - dedendum angle
Pitch angle + addendum angle
Pitch angle + dedendum angle

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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 with cross-section of 33 mm
Metric threads of 33 mm outside diameter and 2 mm pitch

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