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To fabricate a bolt-clamped large diameter Langevin torsional vibrator as designed is usually difficult. A torsional vibrator tightened with an outside bolt is proposed in which the designed characteristics in the resonant vibration of the normal mode is achieved. A torsional vibrator 80 millimeters in diameter with a calculated resonant frequency of 28kHz has been fabricated. The resonant frequency of the torsional vibrator is 26.1kHz, the quality factor is 890 and the maximum angular velocitydoi:10.1250/ast.18.239 fatcat:xdbwvwtubfemlnmlrl5a4tfa4u