Common Conveyor Roller Imperial Dimensions

We'll provide a concise table of typical idler roller imperial dimensions based on common industry standards (e.g., CEMA—Conveyor Equipment Manufacturers Association), along with some explanatory notes. Our conveyor rollers are widely used in our stacker conveyors and mobile ship loader conveyors. If you need a specific standard, trough angle, or application (e.g., flat, troughed, return idlers), let me know!

Typical conveyor idler Roller Dimension Table

Roller Diameter (inches/mm)	Roller Length (inches/mm)	Shaft Diameter (inches/mm)	Belt Width (inches/mm)	Load Rating (lbs/kg)	Type/Application
4" / 101.6 mm	15"–27" / 381–686 mm	3/4" / 19.05 mm	18"–24" / 457–610 mm	250–500 lbs / 113–227 kg	Flat or Return Idler
5" / 127 mm	21"–39" / 533–991 mm	3/4"–1" / 19.05–25.4 mm	24"–36" / 610–914 mm	500–900 lbs / 227–408 kg	Troughing Idler (20°–35°)
6" / 152.4 mm	27"–51" / 686–1295 mm	1"–1.25" / 25.4–31.75 mm	36"–48" / 914–1219 mm	900–1500 lbs / 408–680 kg	Heavy-Duty Troughing/Return
7" / 177.8 mm	33"–63" / 838–1600 mm	1.25"–1.5" / 31.75–38.1 mm	48"–60" / 1219–1524 mm	1500–2500 lbs / 680–1134 kg	Extra Heavy-Duty (e.g., mining)

Key Notes of Conveyor Idler Roller Dimension

Roller Diameter

4"–5" are common for lighter belts and smaller loads.
6"–7" are used for heavier-duty applications like mining or aggregate handling.

Roller Length

Varies with belt width and idler type (e.g., troughing idlers are shorter per roller due to multiple rollers per set—typically 3 or 5).
For troughing idlers, the total "face width" spans the belt, but individual roller lengths depend on trough angle (e.g., 20°, 35°, 45°).

Shaft Diameter

Increases with roller size and load to handle bending stress from belt tension and material weight.

Belt Width

Standard widths align with CEMA specs (18", 24", 30", 36", 42", 48", 54", 60", etc.).
Roller length is slightly longer than belt width to fit within the conveyor frame.

Load Rating

Depends on bearing type (e.g., ball bearings), roller material (steel is standard), and spacing (e.g., 4–10 ft for carrying idlers, 10–15 ft for return idlers).

Types

Flat Idlers: Support the belt without troughing (e.g., return idlers).
Troughing Idlers: Angled to shape the belt into a "U" (common angles: 20°, 35°, 45°).
Return Idlers: Support the empty belt on the return side.

Example Configurations

CEMA B (Light Duty): 4"–5" diameter, 18"–48" belt width, ~500 lbs capacity.
CEMA D (Medium Duty): 5"–6" diameter, 24"–60" belt width, ~1000 lbs capacity.
CEMA F (Heavy Duty): 6"–7" diameter, 36"–96" belt width, ~2500 lbs capacity.

Additional Considerations

Troughing Sets: Typically 3 rollers (center roller longer, wing rollers shorter) or 5 rollers for wider belts.
Standards: CEMA, DIN, or ISO specs dictate sizing; CEMA is widely used in North America.
Materials: Steel (galvanized or painted) is standard; rubber-coated or polyurethane options exist for impact zones.

We provide various specifications and models of mining conveyor rollers and quarry conveyor rollers for your project. If you need a specific type (e.g., impact idlers, self-aligning idlers) or a detailed table for a particular belt width or standard, let me know, and I can refine this further!