K1250B1/4 is a machined aluminum control knob featuring a 3-flute design with indicator line and black finish. The knob has a maximum diameter (A) of 1.25 inches (31.8 mm) and is designed for 1/4" shaft applications with a rotation angle of 251° (6.37 mm). Key dimensional specifications include a body diameter (B) of 1.11 inches (28.2 mm), a flute depth (C) of 0.984 inches (25.0 mm), and a shaft bore diameter (E) of 0.750 inches (19.1 mm). The knob is secured with NO. 6-32 set screws at two locations and features an indicator line for precise positioning. This knob is commonly used in industrial control panels, test equipment, and instrumentation where reliable manual adjustment and clear position indication are required.