Machine Design
A woodruff key is

Fitted in pairs at right angles
Capable of tilting in a recess milled out in the shaft
All of these
A tapered key with head at one end

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

Bolt of 33 mm nominal diameter having 2 threads per cm
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

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