Don Dye Idler Pulley Range — Quick Reference
Don Dye manufactures V-belt idler pulleys + flat flanged idlers for tensioning and guiding belt drive systems in agricultural machinery, HVAC equipment, conveyors, mining plant and production equipment. Selection turns on the belt section being tensioned (A/B/C/5V) and whether the idler runs on the BACK of a V-belt (flat flanged) or in a groove (V-section).
| Idler Type | Belt Section | Mounting | Best For |
|---|---|---|---|
| A Section V-Idler | A classical (13 × 8 mm) | Pilot bore or shaft mount | Light machinery, small motors |
| B Section V-Idler | B classical (17 × 11 mm) | Pilot bore or shaft mount | Medium-power drives, fans, pumps |
| C Section V-Idler | C classical (22 × 14 mm) | Pilot bore or shaft mount | Heavier industrial drives |
| 5V Section V-Idler | 5V narrow (15.9 × 13 mm) | Pilot bore or shaft mount | 5V narrow-section drives — heavy industrial + mining |
| Single Row V-Idler | Per section | Standard single-groove tensioner | Single-belt drives — most common application |
| Double Row V-Idler | Per section | Twin groove for multi-belt drives | 2-belt parallel drives — agricultural, larger industrial |
| Flat Flanged Idler | Flat belt OR V-belt back-face | Pilot bore with flanges | Flat belt tensioning, V-belt back-side tensioning, belt routing |
| Flat Non-Flanged Idler | Flat belt | Pilot bore | Flat belt tensioning where belt cannot wander off pulley |
Idler positioning: idlers can run on the INSIDE of a V-belt (V-section idler in the groove direction) or the BACK of a V-belt (flat flanged idler). Inside-belt idlers stabilise drive geometry; back-side idlers add belt wrap or reduce belt slap. For complete V-belt range, see V-belts and our V-belt measuring guide. Companion: idler pulleys, V-pulleys, timing pulleys.
Don Dye V-Belt Idler Pulleys — A, B, C & 5V Section, Flanged & Non-Flanged
Don Dye is a power transmission component brand producing V-belt idler pulleys in A, B, C, and 5V belt section profiles in single and double row configurations, and flat flanged and non-flanged idler pulleys for tensioning and guiding flat belts and the back face of V-belt drive systems in agricultural machinery, HVAC equipment, industrial conveyors, mining plant, and manufacturing production equipment.
Idler pulleys serve two distinct but equally critical functions in belt drive system design and maintenance.
The first function is belt tension maintenance — V-belts elongate progressively over their service life as the fibre cords in the belt tension member experience creep under repeated load cycling, and as this elongation reduces belt tension, belt slip against the drive sheave increases, power transmission efficiency falls, and the belt heats through friction at the slip interface in a deteriorating cycle that ends in belt failure.
A correctly adjusted idler pulley restores the tension to the specified range and restarts the service life clock for the belt tension without requiring adjustment of the fixed sheave centre distance.
The second function is belt path geometry control — in drive arrangements where the required belt wrap angle on the small sheave cannot be achieved with a direct drive geometry due to centre distance and sheave size constraints, an idler pulley redirects the belt path to increase the wrap angle on the drive sheave, increasing the maximum torque the belt can transmit before slip. V-belt idler pulleys must match the belt section profile (A, B, C, or 5V) precisely to seat the belt in the groove correctly — a mismatched idler causes the belt to ride on the groove sidewalls rather than seat in the correct bearing position, causing premature belt edge wear, groove flank deformation, and early belt failure.
Don Dye’s range covers the most common section profiles in the configurations required for the full spectrum of industrial and agricultural belt drive service lives and load ratings.
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