BC Model Caliper Brakes provide static torque capacity up to 8800 In. Lbs. @ 80 psi with a 24-inch disc. Air-actuated caliper spacing is adjustable to fit 0.188 to 1.500-inch wide rotating discs and linear traveling devices. Optional discs are available from 16 to 24-inch diameter. Disc Speeds up to 2800 rpm. QD Bushing is compatible with shaft sizes up to 3.875 inches. The disc must be ordered separately. QD Bushing is customer furnished. Check with the QD Bushing manufacturer for bushing torque ratings.