PennEngineering® Large knob, spring-loaded Types PF11 and PF12 - Metric PF12-M4-0

The PF12 series consists of large knob, spring-loaded captive panel screws designed for secure attachment of thin metal panels with subsequent access required. These fasteners install into standard holes and provide a positive retention force, with performance data for the M4 thread size showing a retainer pullout force of 20 lbf (89 N) in cold-rolled steel and 710 N in aluminum. The screw head features a knurled or smooth metal cap and is available in multiple mounting styles, including self-clinching. The spring-loaded design prevents loss of hardware during servicing. Mounting and installation conform to PEM® standards for captive hardware.