6 Packs Titanium Combination Drill & Taps Bit Set SAE 6-32nc 8-32nc 10-32nc 10-24nc 12-24nc 1/4-20nc.

Maybe I had a better experience with these drill taps because I have used and know how brittle taps are. Taps will break on you if you don’t keep them straight. So I went slow and steady as possible using an impact drill driver and had no issues at all.

The media could not be loaded. I had 60 parts to make that all had only 1 hole to drill and tap in each one, and I didn't want to spend the time to do another tool change, so I had an idea to use one of these drill/tap combination bits and just write a combined drill/tap cycle. I had to find an ER20 hexagon collet, but once I had that, this all worked really great! I'm using a stepper motor for a tapping spindle because I can precisely control the rotation and keep it in sync with the down feed. I'm feeding the correct amount per rotation following the charts, and of course for the tap I need to feed at the tap pitch, but I have not broken one of these yet, in fact, I still have the first one in the machine. It sees to cut well, making uniform spirals. This is only aluminum, so it's pretty easy to drill and tap, and I am using a drop of oil on each hole.

I broke the 1/4 -20 almost immediately. In retrospect I probably should have used my drill vs 1/4 hex shanked impact driver, and would had have more control of the speed. Contacted the company and they immediately sent out a replacement. Wasn't happy tap broke, but the company did stand behind their product.

Each bit last for about two holes on 12 guage mild steel. The taps work ok but the drill bits don't hold an edge to cut more than two holes. I used cutting fluid and went slow to try and make these last but these just would not hold up.

Very sharpness

I’m giving 3 stars, because they did eventually get the job done, but not without some frustration. I think if you were using them on a drill press, they may work better. I was free hand drilling through 3/16” aluminum. Thankfully, all but one of the four that broke, broke off with enough sticking out that I could easily remove it with vise grip pliers. I think they actually seemed to work better with my 20v Dewalt impact driver at slow speed, than they did with the drill. With a typical tap, I am used to running it in partially, then backing out, then running in some more, backing out, etc. With the first 3 that broke, attempting to back out when I felt too much resistance is when they broke. I had more success with them when I would just slowly let the impact driver power through the resistance. Ended up finishing the job just fine. I still prefer this to drilling, then tapping, but be prepared to deal with some broken bits.

Great pricing and fast delivery. Used them as soon as I received them and they are very high quality and durable. Will be ordering another set for my other garage.

Good