Chucks - Geared
Geared chucks feature a serrated collar which a chuck key meshes into in order to turn and subsequently tighten or loosen the chuck. Often preferred on large capacity drilling machines and diamond drills, geared chucks tightened with a chuck key can exert more gripping force on the shank of the accessory and are also easier to release should any arbors or shanks become overtightened during the drilling operation.
Geared chucks with a female mounting thread are common on portable power tools but in environments requiring precision drilling, taper fitting chucks are de riguer.
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