self-tapping Zerk

I looked at the link but what I see has no visual indication of being a self tapping fitting. A self tapping screw or fitting has flutes like a tap to cut the initial threads. After threads are cut, the little metal pieces have to be removed so they don't get in the bearing cavity.

The non threaded fittiings can be removed and replaced with new ones if the right tools are available. On threaded ones, chaser tools are made to help straighten some lightly damaged threads but badly buggered ones render the part unusable.
 
rotorwrench said:
I looked at the link but what I see has no visual indication of being a self tapping fitting. A self tapping screw or fitting has flutes like a tap to cut the initial threads. After threads are cut, the little metal pieces have to be removed so they don't get in the bearing cavity.
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On one batch of Heil hoists we were installing; we found the holes for the zerks were not threaded. Call and learned they now provided "self-tapping" zerks. Looked like regular zerks but longer, maybe tapered more, and likely hardened. Had to rig up a socket to both push and turn them in place. Not tight enough they leaked; just a headache. Idea didn't last long; soon they switched to drive in zerks; another maintenance headache.
 
Going into soft metal is more possible than going into forged steel. I would just tap the hole for a regular fit depending on pipe thread or straight thread. I have driven the fittings in for model A components using the special driver but the fittings fit too tight and I had to hand fit each one to prevent damaging the softer metal fittings that are available. It was a big PITA for sure but I got them in there.
 
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