PennEngineering® Large Knob, Spring-loaded - Types PF11MF and PF12MF - Unified PF12MF-440-1-BL

PF12MF-440-1-BL is a large knob, spring-loaded, flare-mounted captive panel screw with a DuraBlack finish, designed for secure fastening of thin metal panels with easy service access. The screw features a #4-40 thread, hardened carbon steel body with zinc plating per ASTM B633, an aluminum knob and retainer, and a 300 series stainless steel spring. It installs into panels with a minimum thickness of 0.041 inch and has a minimum floating capability of 0.010 inch in all directions. The knurled cap and flare-mount design ensure positive installation stop and alignment, with a Phillips #1 driver recess. The DuraBlack finish applies to both the knob and screw. Part dimensions include a total length of 0.450 inch and a panel hole size of 0.187 inch maximum.