Patriot chuck dedicated thread to fit lathes with 33mm x 3.5mm thread.
The Patriot chuck is manufactured in Sheffield and you can rest assured that the engineering quality is as high as you would expect from any Robert Sorby product together with an unrivalled guarantee of service and commitment from all Robert Sorby staff. Powerful grip both ways. 25mm jaw movement. Easy one-handed tightening with T bar Excellent range of inter-changeable screw-on jaws. Also takes Nova jaws and threaded inserts Remove jaws to reveal the jaw sliders which can grip tiny round or square objects Compact for low overhang. Body is 100mm diameter. Self-centering jaws. Enclosed gears. Lightweight.

Important.The threaded inserts will not fit so you cannot change the thread. The 33mm thread is cut direct into the chuck body. If you want a Patriot to fit another thread you need to purchase "Patriot chuck with threaded insert". (click your browser back button and you will probably see it next one down in the list)