PennEngineering® Large Knob, Spring-loaded - Types PF11MF and PF12MF - Unified PF12MF-0420-0

PF12MF-0420-0 is a spring-loaded, flare-mounted captive panel screw with a 1/4-20 thread, designed for secure attachment and easy service access without loose hardware. The screw features a hardened carbon steel body with zinc plating per ASTM B633, a 300 series stainless steel spring, and an aluminum knob and retainer with a natural finish. It installs into a minimum 0.290 inch thick panel with a maximum hole size of 0.323 inch for sheet thickness. The assembly provides a minimum 0.010 inch float in all directions and a positive stop during installation via a shoulder. The nominal installed height above the sheet is 0.530 inch with a driver recess size of #3.