Adapt your Insert Type NOVA Chuck to a 1″ 8TPI RH UNC lathe. Allows you to keep the same chuck and accessories if you change your lathe. You only need to change the insert/adapter. The internal thread is 1″ 8TPI and the external thread matches the NOVA insert type chucks to simply screw in. Then your NOVA insert type chuck is ready to attach to your 1″ 8TPI threaded lathe spindle. NOVA Insert Type Chucks include: G3 (SKU 48202) and SuperNOVA2 (23055). Use only genuine NOVA accessories and parts with your NOVA chucks.