PennEngineering® Large Knob, Spring-loaded - Types PF11MF and PF12MF - Unified PF12MF-0420-2

PF12MF captive panel screws are spring-loaded, flare-mounted fasteners with a large knob, designed for easy service access without loose hardware. The screws have a hardened carbon steel body with zinc plating per ASTM B633, a 300 series stainless steel spring, and an aluminum knob and retainer. They are available in unified thread sizes including 1/4-20, with a minimum float of 0.010 inch in all directions. Installation requires a minimum sheet thickness of 0.084 inch and a countersunk hole of 0.410 inch maximum diameter. The screws feature a shoulder that provides a positive stop during installation and are compatible with a #3 Phillips driver.