Chuck device

A chuck device comprising:

• a tube having a central passage and a plurality of inclined holes defined through said tube and communicating with said central passage, a plurality of recesses defined in an outer surface of said tube and communicating with said inclined holes;
• a plurality of clamping members respectively inserted in said inclined holes and each clamping member having teeth defined in an outside thereof, said teeth of each of said clamping members being accessed in said recesses, and
• a nut mounted to said tube and having threads defined in an inner periphery thereof, said threads engaged with said teeth of said clamping members, a groove defined in said inner periphery of said nut and a plurality of balls received in said groove, a pressing ring received in said nut and positioning said balls, an engaging groove defined in said inner periphery of said nut and a C-shaped clamp engaged with said engaging groove and positioning said pressing ring.