IRWIN Bottoming Tap, #6-48NS (1221)

Worked very well tapping a barrel for a bead sight!

Great quality and it works perfectly!

Cut threads without any issues. Would recommend as a purchase.

This was a six-pack of taps, but I only needed one of them to tap eight 6-48 holes for two receiver-mounted picatinny rails. Worked great, I have no complaints, and have zero hesitation recommending this product for those who need one. Good Luck!

A good quality tap, does the job effectively. But, the bottoming taps Im used to are completely flat at the end with the cutting edges all the way to the end, this is not. This is more like a plug tap than a bottoming tap. Still works, but be aware of that.

Purchased the tap more as a thread chaser to clean up threads on rifle receiver. This worked great for cleaning out old Blue Loctite from the scope base screws.

This tap has the common thread pitch for shotgun sights and is very difficult to find in stores; if not impossible. I have a Remington 870 express magnum shotgun which has the front ball sight pressed in; not threaded. After removing the ball sight, I used this tap to begin threading the hole. The hole is very shallow though, so once the tap hits the bottom, I had to dremel off the tapered bottom so I could continue tapping the threads all the way down to the bottom of the hole. For the price, the one time use didnt bother me : )

The IRWIN Bottoming Tap, #6-48NS (1221) is just what the gunsmith ordered. Save yourself a bit if hassle and get the one that comes with the correct drill bit.

This tap worked as expected the first time, although it will not see frequent use in my shop. It did the job just fine so l am pleased with the results. I have no complaints.

Seems well made, but did not use, since appeared would have enlarged threads for Savage 12 FV scope bases too much, and ended up not even having to chase threads in order to mount Warne 7666-20MOA picatinny rail.