PennEngineering® Large Knob, Spring-loaded - Types PF11MF and PF12MF - Metric PF12MF-M3-2

The PF12MF series comprises flare-mounted captive panel screws with a large knob and spring-loaded mechanism, designed for easy service access and secure retention in thin panels. The assembly includes a knurled aluminum knob, aluminum retainer, hardened carbon steel screw with zinc plating per ASTM B633, and a 300 series stainless steel spring. The M3 metric thread variant installs into a minimum sheet thickness of 1.05 mm with a maximum hole size of 4.75 mm and provides a minimum float of 0.25 mm in all directions. The screw length is 7.37 mm for a 2-stroke version, and the driver recess is size #1. DuraBlack finish is available with the BL suffix. Installation requires a countersunk hole, and the shoulder provides a positive stop during installation.