18U201  up for sale is a lot of 12 press in old style steel plated grease zirk fittings , 1/4 inch grease head and these would press into a hole just under 0.323 or about 5/16 drilled hole , these have a serrated form to hold them in the hole once pressed in , great fitting to add grease to a small area or to add a fitting somwhere on equipment ,  note these are open air fittings no check valve on them just  a through hole , new parts from old factory stock made in toledo ohio USA , some oxidation on them from sitting and storage but still very usable , these have NO internal check valve ball in them the hole goes straight through , , very nice quality turned from steel then plated , the total length is 0.613 inch just under 5/8 the major diameter is 3/8 the flange at 3/8 od is about 5/64 wide , the height from the press in bottom out point to the grease entry point is 0.417 just under 7/16 , the serrated area is 0.218 long just under 1/4 inch. looks like a standard grease form on the end 1/4 peak diameter ,the tip hole is 0.054 for grease entry , the back hole is 0.200 inch, 

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