PennEngineering® Large Knob, Spring-loaded - Types PF11MF and PF12MF - Unified PF11MF-440-2

PF11MF-440-2 is a spring-loaded, flare-mounted captive panel screw with a knurled metal cap and a #4-40 thread, designed for installation into thin panels with a countersunk hole. It features a shoulder on the retainer for positive installation stop, an anti-cross-threading design, and a zinc-plated hardened carbon steel screw with a natural finish aluminum retainer and spring. The part installs flush on the back side of the panel and compensates for misalignment, with a minimum float of 0.010 inch in all directions. It meets ASME B1.1 and B1.13M thread standards, and is compatible with standard installation tooling for #4-40 threads.