Machine Design
All stresses produced in a belt are

Compressive stresses
Both tensile and compressive stresses
Shear stresses
Tensile stresses

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

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

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