HHIP 3901-5036 ER-40 Collet Chuck, 100 mm Diameter x 42 mm Height

If you purchased the Vevor 7 x 13.78 mini lathe, this will replace your 3 jaw chuck with no backing plate required, it bolts straight on. Overall diameter is 100mm. Bolt hole spacing is 72mm, the registration circle on the back is also 72mm.

I bought a blank adapter plate and machined it to fit my lathe spindle and then machined the other side to fit this chuck. It runs within 1/2 a thou. (0.0005" ) I was a bit disappointed by the wrench they supplied with the chuck. It is the wrong size in my opinion but it does sort of work. I had a more suitable one that came with another device so I use it instead.

wow half a thousand off runout very please with that tool

Very hard to thread back on, really wants to cross thread.

The product is of good quality for the price, arrived quickly, and was as described - with one exception. In the online drawing, the internal bore which mates with the lathe backing plate for concentricity is specified as 53.975 mm dia. with a very tight tolerance. The design has apparently been altered, as the bore was about 52.0 mm. As I didn't have an inside micrometer to measure it to high precision, I had to proceed very slowly turning my backing plate with very light cuts as I approached the target diameter, testing after each one, to achieve a good tight location fit. I got a good result, but the task would have been easier and quicker if I had had the correct spec.