MS91528-1P2B is a military-specification rotary knob designed for control and adjustment applications in demanding environments. The knob is molded from polycarbonate self-extinguishing thermoplastic with a matte finish, meeting MIL-Std 202 Method 111, and features an aluminum metal insert plated to withstand salt spray testing per MIL-Std 202 Method 101, test condition B. It is secured with two socket head set-screws (type 111, style 4) per specification FF-S-103. The knob accommodates a 0.125-inch shaft diameter with 4-40 set-screw sizing, and features dimensional specifications including a 0.435-inch minimum B dimension, 0.026-inch minimum C dimension, and 0.156-inch maximum D dimension. This QPL-listed component is ideal for military, aerospace, and industrial control panels where reliability, corrosion resistance, and precise dimensional tolerances are essential.