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Idler Roller / Roller Idler & Troughing Idler Set

Roller idlers in TD75 sizes for belt widths from 500 to 1400 mm - troughing sets, flat carrier idlers and the return idlers underneath. They are the

Roller idlers in TD75 sizes for belt widths from 500 to 1400 mm - troughing sets, flat carrier idlers and the return idlers underneath. They are the highest-count part on any plant conveyor and the one that stops it when a bearing seizes.

TD75 troughing idler set (three-roll)

Belt width (mm)	Drawing No.	Roller D (mm)	Roller L (mm)	Bearing	A (mm)	E (mm)	H (mm)	H2 (mm)	Bracket angle	Bracket weight (kg)
500	TD1C1	89	190	204	720	760	210	266	63x63x6	6.73
650	TD2C1	89	240	204	870	910	230	291	63x63x6	7.94
800	TD3C1	89	305	204	1070	1110	240	323	63x63x6	9.13
1000	TD4C1	108	375	305	1300	1350	300	400	75x75x8	17.84
1200	TD5C1	108	455	305	1550	1610	330	460	75x75x8	27.30
1400	TD6C1	108	525	305	1750	1810	350	495	100x100x8	30.00

TD75 flat carrier idler

Belt width (mm)	Drawing No.	Roller D (mm)	Roller L (mm)	Bearing	A (mm)	E (mm)	H (mm)	H1 (mm)	Bracket angle	Bracket weight (kg)
500	TD1C2	89	600	204	720	760	210	165.5	63x63x6	5.75
650	TD2C2	89	750	204	870	910	230	185.5	63x63x6	6.70
800	TD3C2	89	950	204	1070	1110	240	195.5	63x63x6	7.89
1000	TD4C2	108	1150	305	1300	1350	300	246	75x75x8	15.38
1200	TD5C2	108	1400	305	1550	1610	330	276	75x75x8	24.00
1400	TD6C2	108	1600	305	1750	1810	350	296	100x100x8	26.50

Warehouse stock and loading

Photographs taken in our own warehouse: finished jaw plates in stock, packed for export, and loaded for shipment. Stock levels change week to week — ask what is on the floor before you plan a shutdown.

What a roller idler actually does - and how it fails

A roller idler supports the loaded belt and sets its line. Three-roll troughing sets fold the belt into a trough so the load sits in the middle instead of spilling over the edges; flat carrier idlers carry the belt where the load is already spread; return idlers hold up the empty side on its way back.

The failure is almost never the tube. It is the bearing: grit works past the seal, grease is pushed out, and the roller stops turning. A stopped idler under a loaded belt rubs rather than rolls, and the belt cover fails at that point within days. That is why the seal and the grease path decide the service life of a roller idler, not the wall thickness of the tube.

• Sealed for life on plant duty; greasing points where the conveyor is maintained on a schedule.
• Roller ends are the wear item - a plant that keeps one spare set per 50 m of conveyor never waits for a delivery.
• A seized return idler is the usual cause of a belt that starts to track to one side, so check the return side before adjusting the frame.

Choosing by belt width, not by habit

The set is sized by belt width: the roller length (L) has to leave the belt supported across its full width without pinching the edges, and the bracket height (H2) fixes the trough profile. The tables below are the TD75 sizes we hold tooling for, from 500 mm to 1400 mm belt, in 89 mm and 108 mm roller diameters.

Above 1000 mm belt the roller diameter steps up to 108 mm with the 305 bearing, because a 89 mm roller at that span deflects under a loaded belt and the belt then runs on the middle roll only.

Trough angle and belt training

A 30-degree trough is the default for aggregate; 35 and 45 degree sets carry more cross-section on the same belt but are harder on the belt edge and need a straighter frame. If a conveyor will not train, the cause is usually one of three things: a seized idler, a set that is not square to the belt line, or a loading point that throws the load to one side. Change the idlers and the loading chute before touching the trough angle.

Belt widths	500-1400 mm
Roller diameters	89 mm / 108 mm
Bearings	204 / 305
Standard	TD75
Price	USD 10-20 per piece

Other parts in this group

• Conveyor Belt
• Conveyor Pulley

Independent aftermarket parts supplier. Not affiliated with, endorsed by, or sponsored by Metso, Sandvik or any other original equipment manufacturer. Brand and model names are used only to describe fitment.

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