K72-100 Lathe Independent Chuck 4 Inch Chuck 4 Jaw 3500 r/min | 4 Inch Manual Chuck 4 Jaw

The price, and quality are justified for a small lathe. This product would also work well with dividing heads, and tables. I am able to center my work as accurately as any other 4 jaw chuck could achieve. Recommend buy for anyone with a small import lathe regardless of what you use it for.(*side note* this chuck doesn't come with studs to install it, which makes a great beginner project for a small lathe)

This is a great lathe chuck for my purposes . It is well made and with the 4 bolt design it fit my spindle plate great. It is not self centering but that is fine with me.

This is an unbranded K72-100 independent four jaw mystery chuck. I could find no manufacturer in China or elsewhere related to “Yunnergo” and the seller on Amazon is a general import-export company. The origin is most likely China from either the Zhedong Machine Tool Company or perhaps Sanou, but one can only guess. That said, it appears to be a reasonably good chuck for the price. It uses a 6 mm key rather than the 8 mm key on my Sanou 3 jaw chuck, and lacks an oiler port. This chuck uses four mounting bolts rather than 3 with my other chuck, but the spindle backing plate on my 8x16 minilathe has a total of 6 holes spaced to fit both 3 and 4 hole chucks. As other reviewers have stated, the included bolts are useless since there is less than 20 mm clearance behind the backing plate on my lathe. I purchased some M8-1.25 x 35 mm hex socket grub screws and matching nuts to mount it and those worked fine. The jaws fit cleanly and operation of this chuck is smooth. Neither the chuck body nor any of the individual jaws are numbered, so I will stamp my own after optimizing in setup. The runout of this chuck was about 0.0005”. Not exceptional in any way but this chuck seems to be worth the price and it works fine for my purposes.

First the chuck: It was in pristine condition, and no cleaning and deburring was necessary. I took it apart, inspected it, and put it back together. It has smooth operations. I put this on my Vevor 7x16 minilathe. How does it fit, you ask? Well, it doesn't, out of the box. The spindle plate on my vevor is 3 bolts, and this is 4 bolts. Pretty sure this is standard fare, as I looked high and low for a 4 jaw independent with 3 bolts, and it's a no go. For some reason a 4 jaw centering chuck DOES have 3 bolt pattern. So while you can by an adapter plate on places like aliexpress, I wanted to see if I could drill out my spindle plate on my lathe so this would be a direct bolt in, and it wasn't a problem. First thing I did was to mark what I wanted as "hole #1" on the spindle plate. I used a punch to do that, and marked "hole #1" on the chuck. I also marked the points for hole 2, 3 and 4 on the chuck. Then I made 3 "transfer screws". You can look on youtube to see how to do that. It's essentially taking a hex wrench that you have laying around which fits the studs on your existing chuck, and making a pointy tip, then transferring the marks to the lathe. Similar to a transfer punch. Once the marks were on the spindle plate I made them slightly more pronounced with a transfer punch. I then drilled then out with a centering bit, 4mm, 6mm, and finally an 8.5mm punch. The studs for this are 8mm, so the extra half gives you a little wiggle room. I was able to drill it while still on the lathe with a right angle drill. A regular drill would work but I didn't feel like taking the carriage apart to make room. Note that when drilling this by hand, you MUST lock down the spindle, otherwise you can easily jam while drilling and spin the spindle and you with it. I locked it down with some vice grips strategically placed on the lock nuts for the spindle plate inside the gear box. Once I got the procedure down it took maybe 10 minutes for the 3 holes. After I drilled the holes I tested for fit. One of them was a little out of position so I used my dremel to slightly enlarge it. After I mounted the chuck up, I also punch marks for holes 1,2,3,4 on the spindle plate. So how does it work? It works GREAT. I was easily able to dial in my material. I also put in an oblong bar sideways and flattened one side. Who needs a mill?!!? Yes, you will have to get one more 8mm stud and bolt to get all 4 bolts mounted up, but you can make one, you have a lathe!!

fit right on my 9x20 lathe bsckplate. I had to drill 3 more holes in the backplate since this has 4 mounting bolts.

Comes with bolts that will not fit in the space behind the plate on the vevor mini lathe. The chuck fits the plate perfectly but the bolts will not fit through the gap. If you buy 8mm grubscrews or studs and mount those on the chuck, you will find that the mounting plate is already drilled for both 3 and 4 stud mounting. At least the vevor lathe I bought was already set up...I think it is because vevor already sells a four jaw as an option with these lathes. To tighten them properly you need to hold the stud with the allen screw while doing the initial tightening, so you can't use, say, threaded rod unless you loctite it in place.

had to clean up some burrs otherwise great product

The 4" independent chuck can be installed on my 8x14 mini lathe which comes with a 4" K11-100 3 jaws chuck. Luckily, there are holes for 3x 8mm and 4 x 8mm bolts ready for a 100mm chuck. Original chuck is not centered well ( ~0.15mm off). After replacing the new 4 jaws chuck, the D=20mm steel rod could be centered as good as 0.01~0.02mm. I do recommend the product for its quality and package in delivery. The only issue is that enclosed 4x8mm bolts are useless. I have to order shorter 8mm threaded rods to fix the chuck because of the limited space on the back palte.