ZOOMRY
1. Product Overview
ZOOMRY CEMA B equal troughing idlers feature a symmetrical three equal-length roller design for maximum carrying capacity on light-duty conveyors. Engineered to CEMA B standards for mining and industrial conveyors up to 48-inch belt width, these troughing idlers distribute material weight evenly across all three rollers — maximizing load capacity while minimizing belt stress at idler junction points. Available in 20°, 35°, and 45° trough angles with 4-inch and 5-inch diameter rollers and labyrinth seals.
Equal troughing idlers are the most widely specified carrying side idler — the industry standard for continuous bulk material transport. The symmetrical design provides predictable belt support across the full width, making them the preferred choice for aggregate and cement conveyors where consistent material loading is expected.
2. Equal vs Unequal Troughing (CEMA B)
| Feature | CEMA B Equal Troughing (B7) | CEMA B Unequal Troughing (B1) |
|---|---|---|
| Roller Configuration | 3 equal-length rollers (symmetrical) | L1 (long center) + L2 (short wings) |
| Primary Advantage | Maximum load capacity, uniform weight distribution | Enhanced belt tracking, reduced edge spillage |
| Belt Support | Uniform across full belt width | Offset — more support at center |
| Trough Angles | 20°, 35°, and 45° | 20° and 35° |
| Best For | Standard conveyor sections, uniform materials, max capacity | Irregular materials, tracking-prone sections |
3. Key Features
Symmetrical Equal-Length Rollers — Three identical rollers distribute material weight uniformly across the full belt width, maximizing load capacity for coal and aggregate conveyor carrying sections.
CEMA B Light-Duty Rating — 4-inch and 5-inch diameter rollers with standard frame geometry for belt widths up to 48 inches — the most widely specified carrying idler configuration for light-duty conveyors.
Three Trough Angles — Available in 20°, 35°, and 45° to match material characteristics and throughput requirements. Higher angles increase cross-sectional area and capacity.
Advanced Labyrinth Sealing — Multi-stage seals protect bearings from dust and moisture in cement and mineral processing environments.
Industry Standard Design — The most widely specified carrying side idler, compatible with all CEMA B conveyor structures for straightforward replacement and global spare parts availability.
4. Dimensions – CEMA B Equal Troughing 20° / 35° / 45°
ZOOMRY CEMA B equal troughing idlers are manufactured with 4-inch and 5-inch roller configurations for belt widths from 18 to 48 inches at all three standard trough angles. Suitable for light-duty CEMA B carrying sections in mining, coal, cement, and aggregate conveyors:
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4" Roller | 5" Roller |
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| Angle | BW | A | B | L | H1 | H2 | W | H1 | H2 | W | E | F | K |
| 20° | 18 | 27 | 29 | 7 1/4 | 6 1/2 | 8 5/8 | 21 1/2 | 7 | 9 1/16 | 21 1/8 | 6 | 8 | 1/2 |
| 24 | 33 | 35 | 9 1/16 | 6 1/2 | 8 5/8 | 27 1/2 | 7 | 9 1/16 | 27 1/8 | 6 | 8 | 1/2 | |
| 30 | 39 | 41 | 11 1/8 | 6 1/2 | 8 5/8 | 33 1/4 | 7 | 9 1/16 | 32 7/8 | 6 | 8 | 1/2 | |
| 36 | 45 | 47 | 13 1/4 | 6 1/2 | 8 5/8 | 39 1/4 | 7 | 9 1/16 | 38 7/8 | 6 | 8 | 1/2 | |
| 42 | 51 | 53 | 15 7/16 | 7 | 9 1/16 | 45 1/4 | 7 1/2 | 9 9/16 | 44 7/8 | 7 1/2 | 9 1/2 | 5/8 | |
| 48 | 57 | 59 | 17 1/16 | 7 | 9 1/16 | 51 1/4 | 7 1/2 | 9 9/16 | 50 7/8 | 7 1/2 | 9 1/2 | 5/8 | |
| 35° | 18 | 27 | 29 | 7 1/4 | 6 1/2 | 10 3/16 | 19 1/2 | 7 | 10 9/16 | 19 1/16 | 6 | 8 | 1/2 |
| 24 | 33 | 35 | 9 1/16 | 6 1/2 | 10 3/16 | 25 1/4 | 7 | 10 9/16 | 24 7/8 | 6 | 8 | 1/2 | |
| 30 | 39 | 41 | 11 1/8 | 6 1/2 | 11 1/2 | 30 3/4 | 7 | 11 7/8 | 30 3/16 | 6 | 8 | 1/2 | |
| 36 | 45 | 47 | 13 1/4 | 6 1/2 | 11 1/2 | 36 5/8 | 7 | 11 7/8 | 36 1/16 | 6 | 8 | 1/2 | |
| 42 | 51 | 53 | 15 7/16 | 7 | 13 1/4 | 40 3/4 | 7 1/2 | 13 5/8 | 40 3/16 | 7 1/2 | 9 1/2 | 5/8 | |
| 48 | 57 | 59 | 17 1/16 | 7 | 13 1/4 | 46 3/4 | 7 1/2 | 13 5/8 | 46 3/16 | 7 1/2 | 9 1/2 | 5/8 | |
| 45° | 18 | 27 | 29 | 7 1/4 | 6 1/2 | 11 1/8 | 17 3/4 | 7 | 11 1/2 | 17 5/16 | 6 | 8 | 1/2 |
| 24 | 33 | 35 | 9 1/16 | 6 1/2 | 11 1/8 | 23 1/4 | 7 | 11 1/2 | 22 13/16 | 6 | 8 | 1/2 | |
| 30 | 39 | 41 | 11 1/8 | 6 1/2 | 12 13/16 | 28 3/8 | 7 | 13 1/16 | 27 13/16 | 6 | 8 | 1/2 | |
| 36 | 45 | 47 | 13 1/4 | 6 1/2 | 12 13/16 | 33 7/8 | 7 | 13 1/16 | 33 5/16 | 6 | 8 | 1/2 | |
| 42 | 51 | 53 | 15 7/16 | 7 | 15 1/16 | 37 3/4 | 7 1/2 | 15 3/8 | 37 3/16 | 7 1/2 | 9 1/2 | 5/8 | |
| 48 | 57 | 59 | 17 1/16 | 7 | 15 1/16 | 43 3/4 | 7 1/2 | 15 3/8 | 43 3/16 | 7 1/2 | 9 1/2 | 5/8 | |
Dimensions per CEMA B industry standards. A=Frame width, B=Overall width, L=Roller length, H1=Base height, H2=Overall height, W=Center-to-center mounting width, E/F/K=Mounting dimensions. All dimensions in inches.
What Information Do We Need for Troughing Idler Selection?
- Belt width, conveyor capacity, and material characteristics
- Trough angle requirement and idler spacing
- Material type, bulk density, and maximum lump size
- Operating environment — dust, moisture, temperature range, and corrosion risks
- Existing idler type, frame dimensions, and whether this is a retrofit or new installation
Related Solutions
How to Choose the Right Trough Angle for Your Conveyor?
Tell us your material type, capacity requirements, and belt width — our engineers will recommend the optimal 20°, 35°, or 45° trough angle configuration.
Request Troughing Idler Recommendation →
