What’s this lathe insert used for?

[Ian ParkinParticipant @ianparkin39383]

[Ian ParkinParticipant @ianparkin39383]

I bought this holder for my upright threading inserts that i use and this tip was in it theres no markings on the tip what could it be used for ?

2 rounded crests and a sharp v in the middle

[EmgeeParticipant @emgee]

Perhaps a 90 deg thread form, similar to a tap I made for a wood threading tool that was 3mm pitch.

Emgee

[Henry BrownParticipant @henrybrown95529]

Maybe for forming the fins on a labyrinth seal?

[Author]

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