Perma-Tork® Dimensions Brakes - Solid Shaft 3 4 Model Design Drwg. HB-1/2 Hysteresis 3 PB-6 Magnetic Particle 4 HB6-1 Hysteresis 6 A B .187 .186 .250 .249 1.00 .998 Flat on shaft Flat on shaft 1/4 Sq. Key C D E F G H I J 2.80 2.19 .62 .64 .80 1.4 1.00 1/4-20 Mounting stud 2.68 2.31 .32 1.52 .25 .81 .997 10-24 x 3/8 dp. (3) on 1.75 B.C. 4.57 6.00 2.03 .25 1.63 1.12 2.441 1/4-20 x 5/16 dp. (3) on 2.875 B.C. Permanent Magnet Clutches & Brakes 155 Permanent Magnet Clutches & Brakes 6 Imperial Models (Dimensions in inches)