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

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
Metric threads of 33 mm outside diameter and 2 mm pitch

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Machine Design
The shear stress at a point in a shaft subjected to a torque is

Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
Inversely proportional to the applied torque and the polar moment of inertia
Directly proportional to the polar moment of inertia and to the distance of the point from the axis
Directly proportional to the applied torque and the polar moment of inertia

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