Unequal troughing
conveyor idlers

Belt width determines the length of each idler roll. Standard widths include 18, 24, 30, 36, 42, 48, 60, and 72 inches.

Measure the angle between the center roll and wing rolls. Common trough angles are 20°, 35°, and 45°.

Unequal troughing idlers feature asymmetric wing rolls to accommodate offset belt paths or material flow. Measure the length of each wing roll to get the right replacement.

Calculate the required CEMA rating (B, C, D, E, or F) based on belt width, material density, belt speed, and conveyor length.

Standard roll diameters range from 4 to 7 inches for unequal troughing idlers, depending on CEMA class. Heavier loads and higher belt speeds require larger diameter rolls.

Note whether your existing idlers use standard top mount (conventional bracket mounting) or channel inset mounting (low-profile installation for clearance-restricted applications).

Match bearing type and seal configuration to your operating environment.

Standard steel rolls suit most applications. Specify rubber-cushioned rolls for impact absorption at loading zones or corrosive environments.

Standard painted frames work for general applications. Select galvanized or stainless steel frames for corrosive environments.

Spacing is typically 3.5–4 feet on standard runs and tighter in loading zones. This controls belt sag and supports proper material tracking.