PennEngineering® Large Knob, Spring-loaded - Types PF11MF and PF12MF - Unified PF11MF-832-2

The PF11MF series consists of large knob, spring-loaded, flare-mounted captive panel screws designed for secure attachment of thin metal panels with easy service access. These fasteners install flush on the back side of the panel and are suitable for use with cold-rolled steel and aluminum sheets. The series supports M3, M4, M5, and M6 thread sizes, with retainer pullout forces ranging from 1.1 kN to 2 kN depending on thread size. Installation forces for retainer pullout range from 250 to 400 lbs. The part is identifiable by its unique skirted shoulder and double squares marking, and is intended for applications requiring non-loose hardware to prevent internal component damage.