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

it literally broke on the first bolt hole I tied to clean the existing threads on.... I never have broke a tap in my life and did not put hardly any pressure on it, I do believe it was defective... I lost my money this time

As a gunsmith I deal with many abused platforms. This tap works wonders for chasing 6-40 screws like scope rings and small trigger group screw holes. Ordered and it showed up as promised.

I received this product and it was of great quality and completed the job perfectly. I used it to tap aluminum piping. Unfortunately after completing the job, I realized I had purchased the wrong size. Overall though, it did a great job at what I ordered it to do. Thank you!

Worked like charm saved my but on valve cover head did what supposed to do. Stripped and crossed threaded bolts suck glad u guys had right size great quality held up still looks good glad to add to my tap set will get more taps from u guys in future

Good price. Works well.

Tapped hole in 12L14 steel in one pass, no need to backout to clear chips! Very nice quality.

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.

Good quality and cuts through aluminum like butter.

I used this to clean up the threads on a Model A Ford Zenith carburetor jets.