4.5mm Hex Female and Male-Female Standoffs RAF Electronic Hardware 4.5mm hex standoffs are suitable for basic PCB mounting. The 4.5mm hex standoffs are available in female and male-female styles, thread sizes m2.5 x 0.45 and m3 x 0.5, length ranges from 5mm to 25mm, and a choice of metals including aluminum, stainless steel, and nylon. The RAF Electronic Hardware 4.5mm hex standoffs are RoHS compliant.