Center Pin: ---------------- 2.5mm (Center pin(sig) -5v to -7v) Mating Plug O.D: --------- 5.5mm; Thread size: --------------- 08 x .75mm Washer: --------------------- .315" I.D, .394" O.D. ( Nickel plated steel ) Nut: -------------------------- .065" I.D. .394 O.D. across the flats. Max panel thickness: --- 1-3mm; Panel cutout: -------------- .330"