Sure is. I have added zerk fittings on all the ball joints, both tie-rod ends and the lower rear pivot shafts as well as my full-poly suspension bushings. They all get a Spring greasing. FYI, US zerks are threaded 1/4-28, and one only needs a couple of threads to hold them in place. There are adapters for making 45 or 90 degree fittings, extended fittings and others Those adapters may be threaded larger than 1/4-28.
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