Drill America - DWT54506 5/16-18 UNC High Speed Steel Bottoming Tap, (Pack of 1)

This 6-40 tap cleans the Ruger front sight hole on the Mark III & IV 22/45 Lite.

This 5/8-28 tap matches the thread in the tail of a 2AA Mini Maglite. I had a battery leak, and the resulting corrosion made it very difficult to unscrew the tail cap (I had to clamp it in a chuck). I eventually got it apart, extracted the batteries, and scraped out the residue, but the threads were badly galled. I used a needle file to clean up the external threads on the tail cap, but had to buy this tap to re-cut the internal threads. Note that some internet sources say the Mini Maglite has a 27-pitch instead of a 28-pitch thread. While a 27-pitch thread would probably work just fine (since the threaded part of the cap is only about four threads long), I inspected the Maglite threads under a microscope with a thread gauge and I am certain it is actually 28 TPI. I had no problem re-cutting the internal threads with this tap, and the tail cap now screws right in. Of course, for the price of this tap I could have just bought a new flashlight. But I generally err on the side of buying new tools, and these flashlights are very common (there are at least three in my household) so Im sure this wont be my only opportunity to use it.

It works. But it’s too small for my application

The tap was as described and worked great. Shipping was 7 days.

Cut threads very well into extruded aluminum

Used this tap to remove some metal that had ponded in the threads of a nut that I had welded to something. The tap removed the metal cleanly and accurately, no discernable difference in fit between the repaired nut and a new one. For the average Joe this will likely work fine. Just remember to use a cutting oil to prolong the life of the cutting edges!

The tap worked well its too bad I only needed it once

Worked exactly as it should, no issues here.

Bought this tap to thread holes in a cast iron transmission pan on an old tractor. It cut the iron no problem. Did 8 holes and was still cutting the threads well. Very happy. I used a size F drill bit and then tapped the holes with this. Nice tool.

worked for me