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

Metric threads of 33 mm outside diameter and 2 mm pitch
Metric threads with cross-section of 33 mm
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
Turn buckle has

Left hand threads on one end and right hand threads on other end
Right hand threads on bout ends
No threads
Left hand threads on both ends

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Machine Design
Form coefficient of spring is

Its capability of storing energy
Load required to produce unit deflection
Ratio of coil diameter to wire diameter
Concerned with strength of wire of spring

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