PennEngineering® Large Knob, Spring-loaded - Types PF11MF and PF12MF - Unified PF12MF-440-0-2

PF12MF captive panel screws are spring-loaded, flare-mounted fasteners with a large knob for easy manual actuation, designed for secure attachment of thin panels requiring repeated access. The assembly includes an aluminum knob and retainer, a hardened carbon steel screw with zinc plating per ASTM B633, and a 300 series stainless steel spring. It installs into a minimum 0.170 inch thick sheet with a maximum hole size of 0.417 inch, and provides a minimum 0.010 inch floating capability. The screw thread is 4-40 UNC, with an overall installed length of 0.310 inch and installed height above the panel of 0.450 inch. The part accepts a #1 Phillips driver and features a smooth cap finish. A DuraBlack finish is available with the BL suffix.