TimW(PA) said: (quoted from post at 05:18:16 08/29/07) this brings us to Zerk fittings. If you look at a common zerk fitting you can see it is a tapered thread with 20 threads per inch (TPI). I searched one time thru every industrial supply catalog I could find, as well as online and I could never find a tapered pipe tap that small. Every rescource I could find said to use a 1/4 20 SAE tap. It works fine. Zerk fittings do come in different sizes too so you'll have to get the right ones.....You probably knew all this, but maybe it'll help someone in the archives someday.....Tim
NPT thread standard - smaller sizes:
1/16-27 NPT
1/8-27 NPT
1/4-18 NPT
There is no taper pipe thread that uses 20 TPI. Smaller NPT taps are all readily available - try McMaster Carr or MSC online - they both have an extensive selection.
WRT zerks they come in all manner of threads - NPT, NPS, BSPT, BSPP, SAE, Metric , etc. You have to gage them to know what you have. If it is 20 TPI with a major diameter of .250" it's almost surely 1/4-20 UNF.
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