PennEngineering® Large Knob, Spring-loaded - Types PF11MF and PF12MF - Unified PF12MF-0420-1-2

The PF12MF-0420-1-2 is a spring-loaded, flare-mounted captive panel screw with a 1/4-20 thread, designed for removable panel access without loose hardware. It features a knurled knob, aluminum knob and retainer, hardened carbon steel screw, and 300-series stainless steel spring. The screw installs into panels with a minimum thickness of 0.072 inches and a maximum hole size of 0.323 inches. The flare-mount design provides a positive stop during installation, and the screw is zinc-plated per ASTM B633, SC1 (5µm). It allows for 0.010 inch (0.25 mm) minimum float in all directions. The part number corresponds to the PF12MF series with a 1/4-20 thread and Type 1 length.