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Old Fart
08-15-2020, 10:52 AM
Was going through my grand-father's old tools and found a set of tapered bolts. One has a washer on it so I guess it's to seal something. Anyone know their purpose?

https://i.postimg.cc/yxp3PftZ/IMG-0467.jpg

https://i.postimg.cc/1X3NDxCS/IMG-0468.jpg
Spock
08-15-2020, 05:42 PM
Being tapered & with the fluted sides, they would be self taping metal bolts
No way they would be for wood
5.4MarkVIII
08-15-2020, 07:06 PM
Could be wrong but if I remember correctly there was a time where drain plugs were not a thing. These allowed one to add a drain plug to engine or trans pans.
5.4MarkVIII
08-15-2020, 07:13 PM
Could be wrong but if I remember correctly there was a time where drain plugs were not a thing. These allowed one to add a drain plug to engine or trans pans.

Possibly more farm related than auto?
bbriann
08-15-2020, 07:21 PM
Larger ones are used in cast aluminum oil pans when original threads deteriorated as 5.4mark already mentioned.
Old Fart
08-15-2020, 07:34 PM
Grandpa was a Ford/GM mechanic so it would make sense that they would be drain plugs.
redo75
08-15-2020, 08:16 PM
Old world mechanics used to put the screws to customers. Start small and then work up to big end.