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

PF12MF-440-2-2 is a spring-loaded, flare-mounted captive panel screw with a knurled knob, designed for easy service access without loose hardware. It features a #4-40 thread (ASME B1.1, 2A), a hardened carbon steel screw, aluminum knob and retainer, and a 300 series stainless steel spring. The screw installs into sheets with a minimum thickness of 0.170 inch and has a total installed height of 0.350 inch. It includes a shoulder for positive installation stop, allows a minimum float of 0.010 inch in all directions, and is zinc-plated per ASTM B633, SC1. The driver recess is #1 Phillips.