248502N
Knob
Bendix

Yellow color coded knob with a 0.39 inch hole thread provides a practical manual adjustment and identifier function within control assemblies. The color aids quick recognition during roadside inspections or routine maintenance while the knob remains a durable, low wear component. VMRS 013-003-086 classifies this part within the control interface family for braking and accessory systems. The 42848 category context ties it to operator interface hardware on tractors and trailers. Typical roles include selecting a setting on a valve, calibrating a mechanism, or setting a limit on a control line. The knob tolerances are designed to accept standard shaft adapters, reducing the need for custom hardware. Installation requires matching the hole thread size with the mating shaft and ensuring the surface finish resists corrosion. The finish and construction withstand repeated use in exposed environments, providing reliable identification and adjustment in busy control panels.