Syfer / Knowles SFCD Hexagonal EMI Feedthrough Filters combine a 12-32 UNEF thread with a 6.35mm (0.250") hexagonal head. The series is available in a capacitance range from 10pF to 680nF with C0G or X7R dielectric material. These threaded EMI filters offer a working voltage range of 50VDC to 500VDC, and 500VDC is rated for operation at 115VAC, 400Hz. Syfer / Knowles SFCD Hexagonal EMI Feedthrough Filters range from M2.5 to M8, with UNC UNF and UNEF alternatives in the C section, L-C, T, and pi sections. Typical applications include aerospace, communications, and microwave modules.