Machine Design
Split nut is a locking device in which

One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
A slot is cut partly in middle of nut and then slot reduced by tightening screw
A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end

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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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Machine Design
A hollow saddle key is

A taper key which fits in a key way of the hub and is flat on the shaft
Provided in pairs at right angles and each key is to withstand torsion in one direction only
A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft
A taper key which fits half in the key way of hub and half in the key way of shaft

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