142/143/144 Series 10mm Tunable Coils Coilcraft 142, 143, and 144 Series 10mm Tunable Coils are precision molded in plastic to ensure constant winding pitch and a consistent relationship to the printed circuit board (PCB). The variable inductor coils come in standard inductance values from 0.05µH to 1.5µH with or without shielding. These parts are available without cores for use as fixed inductors. Tuning is done by means of a threaded powdered iron core with a hex socket for easy, positive adjustment. Plated brass shield cans with solderable tabs are optional. The 144 Series parts are available with a tap to meet specific requirements.