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

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

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Machine Design
When a belt drive is transmitting maximum power,

Effective tension is equal to centrifugal tension
Effective tension is half of centrifugal tension
Driving tension on tight side is twice the centrifugal tension
Driving tension on slack side is equal to centrifugal tension

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