Eric, most of our ball joints and tie rod ends have a sheet metal cap formed into the assembly with a hole for a zerk fitting.
The most common classic car zerk fitting is 1/8"-27 NPT. That means National Pipe Thread. Pipe threads are tapered. These straight fittings (not 90 or 45-degree offset) form their own mating threads in the sheet metal. Here is an example... CLICK HERE
CLICK HERE for 45-degree offset zerk fittings.
CLICK HERE for 90-degree offset zerk fittings.
Again, these are 'dirt common' for many decades in U.S. automotive steering compnents. - Dave
The most common classic car zerk fitting is 1/8"-27 NPT. That means National Pipe Thread. Pipe threads are tapered. These straight fittings (not 90 or 45-degree offset) form their own mating threads in the sheet metal. Here is an example... CLICK HERE
CLICK HERE for 45-degree offset zerk fittings.
CLICK HERE for 90-degree offset zerk fittings.
Again, these are 'dirt common' for many decades in U.S. automotive steering compnents. - Dave
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