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Grease Fitting Thread

3766 Views 4 Replies 4 Participants Last post by  revrnd
What is the thread on a typical grease fitting? Is it 1/4" - 20 (UNC) or 1/4" - 28 (UNF). Even though the threads appear tapered, it's not a 1/16 - 27 NPT (too big).

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Thanks guys, I've got the charts & know most of the tap drill sizes off by heart (I'm a retired tool & die maker). At work any items that had grease fittings were vendor sourced, so we never had to drill & tap for them.

The taper kind of threw me off. I've added the info to a little notebook that I carry in my pocket in the shop.
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