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
Spring stiffness is

Its capability of storing energy
Load required to produce unit deflection
Its ability to absorb shocks
Ratio of coil diameter to wire diameter

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