Chuck 31052D Professional Duty Chuck, 1/2-20 Mount, 0.5" Maximum Capacity, 1-23/32" Diameter x 3" Closed Length

installed in dewalt drill, works perfectly

Clamps firmly with negligible runout

The Jacobs name is all that is left. These items are made in China and are of dubious quality, Don't expect these chucks to be equal to the old American made ones.

Is nice quality And works smoothly

Use this on a rotary hammer drill adapter with an 8" auger. Works very well!

Jacobs used to be the company to turn to when you wanted a quality chuck for your drill. I've been using a Jacobs chuck for years on my air drill and have been pleased with the quality.I recently bought three of them for use in a mini lathe that I'm building. The runout on these chucks has me shaking my head in disbelief.When I first built the lathe, I couldn't believe that the problem was in the chucks, after all this is for drills, they have to be precise, right? I guess not. I had a new shaft made at a machine shop and $125 dollars later, found out that there was still major wobble in my lathe. While the first shaft was a problem (threaded rod), We found out that most of the wobble was coming from the chucks. I have (had) one on each end. One for connecting the motor to the shaft, and the other to connect the shaft to a mandrel, and pillow block bearings in between.The elimination of the chuck, and going to a 1/2" coupler instead, took out most of the wobble on the business end of the lathe. The motor end still has a chuck on it, and still has wobble, but that end is not as critical at this point. By eliminating the chuck, I'm not able to use the lathe with much better results.That's saying something when a customer says that getting rid of your product improved their results.So much for Jacobs quality. I guess the executives at the company were more interested in profit margins than customer satisfaction. Guess what their profit margins are going to be when I find a company that still makes a quality chuck at a decent price.

So far…no complaints. This chuck installed perfectly onto my drill press and seems to tighten well

I don't write review , but this deserves it , first off I'm tired of all the imported junk these days .. I have a dewalt angle drill which I really like , keyless chuck which has been junk since day one , I'm drilling hard metal not pine .. Constantly slips , I killed it one day trying to tighten it with a channel lock , found this on Amazon . Overnighted it. Fits perfect it's 1/2 X1/2 , made in USA , worth every penny . Now I have a drill like I used to 25 years Ago when manufacturers took pride in their products . Thanks Jacobs

The keyless chuck I had before would never hold a drill securely enough to keep from spinning, especially when the drill was just starting to poke through at the far side. Granted, I work mainly in heavy steel and I work my tools hard but the old chuck was such a CONSTANT source of frustration. Now, this new one works so well that I no longer dread drilling holes. My only negative is that I waited so long before buying this. What a HUGE improvement!! A great product!!

That is a BIG upgade to my Bosch Hammerdrill ! The original chuck wasnt super good, this one bit and hold very well!

Made well - no screw with it-should have a tapered head one

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Excellent quality!