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

The PF12MF series consists of large knob, spring-loaded, flare-mounted captive panel screws with a hardened carbon steel screw, aluminum knob and retainer, and 300 series stainless steel spring. The part features a knurled cap and installs with a #2 Phillips driver. It has a minimum float of 0.25 mm in all directions and is designed for use with panels of minimum thickness 0.170 in (4.32 mm) for thread size #4-40. The BL suffix indicates a DuraBlack™ finish, with the knob black anodized and the screw black nitrided per AMS2753, Section 3. The retainer and spring have natural finishes. Installation requires a countersunk hole and provides a positive stop via the shoulder during assembly.