PennEngineering® Large Knob, Spring-loaded - Types PF11MF and PF12MF - Unified PF12MF-440-1-2

PF12MF-440-1-2 is a spring-loaded, flare-mounted captive panel screw with a large knob, designed for easy service access without loose hardware. It features a hardened carbon steel screw, aluminum knob and retainer, and a 300 series stainless steel spring. The part installs into panels with a minimum thickness of 0.041 inch and requires a 0.187 inch hole size. It has a #1 Phillips driver recess and provides a float of 0.010 inch minimum in all directions. The screw thread is 4-40, ASME B1.1, 2A. The finish is zinc plated per ASTM B633, SC1 (5µm), Type III, colorless, with a natural finish on the knob and retainer. The shoulder provides a positive stop during installation.