Components · Idlers, Rollers & Frames · Zones 01 · 02 · 04
The wrong idler accelerates wear, causes mistracking, contaminates the return run and shortens belt life — and every metre of belt runs on them. Tru-Trac rollers and frames are built to the operating envelope: bearing, shell, seal and frame matched to belt tension, speed and material.
01 / Engineering logic
Five inputs decide the right idler for any belt position.
02 / Poly-Max roller architecture
The architecture, up close.
The Poly-Max is Tru-Trac's high-performance composite roller — advanced polymer technology that carries the belt at a fraction of steel's weight, with the bearing sealed for life.
- 01
Glass-filled composite HDPE drum
A reinforced shell that resists abrasion, corrosion and chemicals.
- 02
Friction-welded composite bearing housings
Bonded to the shell so they can't separate under heavy load, moisture or thermal expansion.
- 03
Non-contact centrifugal labyrinth seal
Keeps water and dust out of the bearing without adding drag.
- 04
Sealed, greased-for-life 2RS bearing
Retained by a circlip behind an impact-modified nylon end cap.
- 05
Fixed face flinger and full rock shield
Prevents roller jams and shields the roller from trapped rock.
Architecture · up close
03 / The range
The idler & frame range.
Every figure is from the catalogue. Engineering confirms the final specification against your conveyor.
Rollers & idlers
HDPE Idler (Poly-Max)
Lightweight composite roller — up to 50% lighter than steel troughing rollers and 60% lighter than steel return rollers.
- 10 dB quieter than steel; reduced power demand and breakaway mass.
- Shaft diameters: 20–60 mm. Shell diameters: 114–219 mm.
- Total Indicated Runout (TIR) 0.2 mm; out-of-balance tolerance 0.028 Nm.
- Flame-retardant and FRAS options; resists abrasion, corrosion and chemicals.
Steel Idler
Welded end housings for smooth rotation and quiet, economic operation.
- Minimised rim drag, breakaway mass and bearing misalignment.
- Multi-labyrinth seal with an external contact seal.
- Standard lengths to SANS 1313; custom lengths available.
- Conforms to international standards.
Impact Rollers
Rubber discs on a steel tube to absorb impact in loading zones; install in reinforced frames or retainer plates.
- Roll diameters: 133 / 152 / 159 mm. Shaft diameters: 25 / 30 mm.
- Standard Impact Idler: steel bearing housing, 101 mm inner tube.
- Heavy-Duty Impact Idler: nylon bearing housing, 127 mm inner tube, larger bearing and compact rubber rings for greater impact.
Frames
Idler Frames
Configurations to SANS 1313, DIN and CEMA, plus custom.
- Belt widths: 450–2400 mm.
- 1, 2, 3 or 5-roll designs; offset or inline; top-mounted or underslung.
- Precision jig-manufactured from graded materials for symmetry — prevents idler bounce and vibration.
- Designed to the conveyor's loading and deflection limits.
Slider Trough Frames
Sliding mechanism changes troughing rolls without lifting the belt or removing adjacent frames.
- Compact inline design for tight or confined spaces; installs under loading chutes.
- Electro-galvanised frame for corrosion protection.
- Customised to fit any manufacturer's rollers; compatible with all idlers and impact idlers.
Application types
Configured for the job on your belt.
Specify idlers for the duty.
Tell us the belt, material and duty cycle and we'll specify the idler architecture for the conveyor.