B-50 Dimensions & Specifications Dimensions (millimeters in shaded area) E F G H L O P R AA AC - 2.90 0.48 0.79 1.75 - 1.7505 - 0.88 - B-50A 11.00 4.00 10.88 5/16-18 5.21 2.91 0.27 1.03 1.97 16.83 1.7505 5.97 0.88 2.69 B-50 73.7 12.3 20.2 44.5 22.2 - B-50A 279.4 101.6 276.2 5/16-18 132.2 73.8 6.8 26.1 50.1 427.4 44.46 151.6 22.2 B-50 A B C D 10.00 3.50 10.06 5/16-18 254.0 89.0 254.0 5/16-18 - - 44.46 - 68.4 AE1 AE2 1.22 - Z Keyway Set Screws 10.25 3/8 X 3/16 (2) 3/8-16 1.22 16.18 10.25 3/8 X 3/16 (2) 3/8-16 31.0 260.4 9.5 X 4.8 (2) 3/8-16 31.0 411.0 260.4 9.5 X 4.8 - (2) 3/8-16 Specifications (metric in shaded area) Model Rated Torque (lb-ft) (Nm) Heat Dissipation at 1800 rpm of Outer Member Watts hp Non Excited Drag Torque (lb-ft) (Nm) Inertia (WR2) of Outer Rotating Member (lb-ft2) (kg-m2) WT (lb) (kg) Coil Data (90 VDC) Time Constants (Seconds) Rated Current Ω@ 20˚C Current Torque B-50 50 302 0.40 0.70 0.40 54.0 0.17 356 0.38 0.60 B-50A 50 825 1.11 0.70 0.40 63.0 0.17 356 0.38 0.60 B-50 67.8 302 0.40 0.90 0.0168 24.0 0.17 356 0.38 0.60 B-50A 67.8 825 1.11 0.90 0.0168 29.0 0.17 356 0.38 0.60 Time constants are the time in seconds for current or torque to reach 63% of the final value after step function voltage is applied. "Rated current" is the current which will occur from a 90 VDC input to the clutch when the unit is operated at its rated temperature (maximum heat dissipation). Non excited drag torque and torque time constant measured at 1800 rpm. Axis of shafts must lie within 30˚ of horizontal. Brake mounting should be 'floating' type, to prevent overloading bearings. Fan power requirements are 115 VAC, 60 Hz, 1.37 amp. Non-excited drag torque values represent a typical unit after a few minutes of use. Drag torque in a new, unused unit may initially be higher. Magnetic Particle Clutches & Brakes 127 Magnetic Particle Clutches & Brakes Model