Don, I don't know how much this will help you as the ones we replaced were on the fast hitch and per the IH Super C parts catalog are part no. 110 161 which is noted only as a 3/16" lubrication fittings. I looked in my grease fitting assortment and it contains 3/16" fittings but they are all the drive or press type as they have a round shoulder beneath the nipple. The ones on my tractor do in fact have a hex shoulder indicating they are screw in type with threads. The drive ones in my assortment have concentric rings cut into the shank as an aid to retaining them in whatever they would be installed in. I had some help on my restoration as it was done in his heated building (before I had one built) and just remember they were broken off is why they were replaced. I can't recall if they were obtained from CaseIH or not at this point but with the hex shoulder they are screwed in. If you know a good machinist you might have them take a good look at what you have to determine if the hole is in fact threaded (as they would have a thread gauge) or if what you think are threads are from the drive type with the concentric ridges cut into them. And again those on my tractor are definitely screw in type which were obtained from CaseIH as they have the hex shoulder to be installed with a wrench or socket and I don't recall cutting threads for them but again Brian might have put the new ones in when I wasn't present but he doesn't recall anything unusual about them, Hal.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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