SPEED TIGER ISE Carbide Square End Mill - Micro Grain Carbide End Mill for Alloy Steels/Hardened Steels - 4 Flute - ISE1/84T - Made in Taiwan (5 Pieces, 1/8)

These cut through some broken metric class 12.9 bolts ok. A tough task for any end mill. They dulled pretty quickly however. Was running at 3500RPM and using Cutting Fluid. After cutting through the bolts, I milled some cast aluminum, and surface finish was ok. Ra125 range. Probably acceptable for a rather dull bit not running at optimal speeds.

I was pleasantly surprised to fine that these milling cutters were of surprising quality for the price. Most of my milling is in aluminum. I have yet to try them in steel. The carbide seems to handle the work load very well without the flutes clogging up. They also retained their sharpness only slightly less than high grade cutters costing a third more.

I did break one, but the others seemed to hold up ok. I was using them to remove broken exhaust manifold studs in a cylinder head on the vehicle. I used them with a drill bushing in a drill fixture to try and keep my holes straight in an area that was very difficult to access.

The correct speed for a 1/8th carbide end mill is about 10,000rpm. I was not running anywhere close to that speed and I broke one right out of the box. I suspect running much faster should help. Update, I ran my mill at max speed (5000RPM) and the end mill cut beautifully in Steel. As si suspected you have to run these fast or they will break with anything but the slightest sideways pressure.

easy to use

The packaging for this product is good unless you ship by carrriers. My package showed up on time but no end mill—called the company and he couldn’t believe that it would get to me without someone realizing the package was empty . Anyway new one arrived asap and was better than expected, much sharper and cut with less resistance than other end mills in this price range excellent depth of cut, so 5 stars for the product and the company , but not much for the delivery

I used this to elongate alignment bolts in square tubing and 1/8 plate. Worked great and still looks new

These are great end mills for some completing some precision cuts and part geometry...I only gave 4 stars instead of 5 because the last order I placed almost didnt get here to the shop thanks to the US post office...by the time this package got to me it looked like it had been run over by a truck several times, thank goodness it wasnt something fragile.

I wasnt expecting to much out of these end mills due to the price. Let me tell you these .25 end mills are worth more. I used 1 endmill and ran it nonstop on my Bridgeport for 9 hours straight. After the piece was completed I checked the endmill and it was as when I first put the endmill in. I will be buying A LOT more of this brand. Now to test their .375 roughing bit tomorrow

Worked better than expected. Went through an old engine bolt like a hot knife through butter. Bit shows no wear after drilling through the bolt.