Utoolmart R8 Precision Round Spring Collet, R8 Collet, Precision R8 Collet Set, 3/16-inch Mill Chuck Holder, 65Mn Spring Steel, M12 Thread, Taper Spindle R8 Collets for Mill Machine, 1 Pcs

I only buy the sizes I need rather than an entire set so this works for me

They put the wrong threads on the inside it's a POS messed up my bridgeport because of it

Good quality & concentricity.

Decent collet but as others have noted - it's a non-standard M12 drawbar thread! If you're in the US this probably won't work out of the box for you. Either bore it out and press in a sleeve, make a "special" drawbar, or buy something else...

Internal thread is jacked

Been using R8 collet tools for quite some time and should have known better than to go for a discount tool. While this one fit the spindle the threads are ABSOLUTELY WRONG!!! If I try to tighten it it will surely mess up the threads. I checked against a variety of known good ones and this is the only one that’s bad so yes, I’ve double checked. I’ll go back to ordering machine tools from my known suppliers. I’ll toss this one in the scrap bin because I know by the time I’m charged “restocking fees” it’s already paid for. All the better to prevent someone from the same headache. I WOULD NOT BUY FROM THIS MERCHANT AGAIN, it was useless crap!

Purchased this collet awhile ago, but finally tried to use it. Could not get the drawbar to thread into collet. Tried a different collet, drawbar threaded no problem. I again tried the 1/2" collet and again it would not thread onto the drawbar. Using a SAE thread gauge I determined this collet was not a 7/16-20 internal thread. I assume it is a metric thread, because none of my SAE thread gauges worked.

Pretty rough even for chinesiem steel. A handstone was used all over it. I'll use it for an emergency collet. Correction....pos tapped 7/16-14 instead of 7/16-20.