Fastener that hardens the ship's company (3-5)

I believe the answer is:

set-screw

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'fastener' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'hardens the ship's company' is the wordplay.
'hardens' becomes 'sets' (I've seen this before).
'the ship's company' becomes 'crew' (I've seen this in another clue).
'sets'+'crew'='SET-SCREW'

'that' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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