This will be a drive type fitting. There is no need for a tap. To install a drive-type fitting, you will need a hammer and a grease-fitting drive tool (1/4” or 5/16” socket will work as well). The drive tool fits over the grease zerk, connecting with a shoulder above the shank. The fitting is driven into the hole by tapping the drive tool with the hammer.
Roughneck Drive Fit Grease Fittings, 5-Pc., 3/16in. Holes

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- Includes 5 drive-fit grease fittings
- Designed for 3/16in. drilled holes
- Heat-treated, zinc-plated steel for durability
- Up to 6,000 PSI
- Withstands over 72 hours of salt spray exposure before showing red rust
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