Abstract: A slender cylindrical torque-limiting handle for a machinist's vise is built along an internal shaft. A drive clutch with a distal end coupling engaging the vise shaft of a vise, and a proximal end presenting a multiple tooth inclined plane, is affixed to the shaft. A pressure clutch, fitted about the shaft, has a distal end multiple tooth inclined plane complimentary to, and mating with, the multiple tooth inclined plane of the drive clutch. A given rotational torque in a one rotational direction applied to the pressure clutch about the shaft will, in accordance with the extent to which the distal end of the pressure clutch is held pressured to the proximal end of the drive clutch, produce a correspondingly associated angular rotation of the drive clutch, tightening the vise until, at a preset torque, the pressure clutch will thereafter slip relative to the drive clutch.