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

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

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Machine Design
The creep in the belt is due to

Material of belt
Effect of temperature on belt
Unequal extensions in the belt due to tight and slack side tensions
Stresses beyond elastic limit of belt material

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