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Motorized Drive Roller Belts (MDR Belts)

Powered roller belts are also called MDR belts and Moller® Belts. They connect a motorized roller to a group of six to ten slave rollers, called a zone. Usually the motorized roller is in the center of the zone, but on inclines it is at the top end.

When selecting a belt, choose the one that will move your maximum box weight (shown below).  Note that “Max” loads exceed our recommendations, but customers have successfully run at those higher loads using boxes at least 80% as long as the zone. Also note that four-groove rollers let you double box weights, e.g., .210" HT Red belts could move 260 lb. boxes.

Motorized Drive Roller belts

Various Motorized Drive Roller Belts



HT Blue belts

3/16" (4.8mm) HT Blue Belts


High Tension HT Red belts on curve

.210" HT RED Belts on
curve with tapered rollers


HEHT Black Belts on 15 roller zone

HEHT Black Belts on 15 roller zone


5/16 HT Blue Belts on curve with tapered sleeves

1/4"or 5/16" HT BLUE Belts
on curve with sleeves


Four-groove rollers let
you double box weights.

Our Speedy Roller Installer
makes installation easy.
Abuse Resistant HT Rough Green Belts

Abuse Resistant
HT Rough Green Belts

Four groove motorized drive rollers are made by Holjeron. Itoh Denki makes two groove end caps that can provide an additional 2 grooves/roller. Ralphs-Pugh makes 4 groove idlers.


Flat belts move more per roller

Flat Belts move 120 lbs/roller


Flat and round conveyor belting

Flat & Round Belts move 200 lbs/roller


Motorized Drive Roller (MDR) Manufacturers

(arranged alphabetically)
Interroll, Itoh Denki, Holjeron, Pulse Roller
  1. Standard 3/16” (4.8mm) belt 83A  Color: clear. For boxes up to 50 lbs (6 lbs/roller). Stretch:14%.  NSN# 3030-04-000-7603

    Long Life HT (High Tension) Belts
  2. Long-Life 3/16” (4.8mm) HT BLUE belt 85A  Color: “Post Office Blue”.  For boxes up to 80 lbs (9 lbs/roller).  Max 100 lbs.  New version is 9% stronger, so new max should be 109 lbs. Stretch: 20%.  NSN# 3030-04-000-7603
  3. Long-Life .210” (5.3mm) HT RED belt 85A  Color: translucent red. For boxes up to 100 lbs (12 lbs/roller).  Max 130 lbs. Used on curves in postal distribution centers. See adjacent picture. Stretch: 20%.
  4. Long-Life .216” (5.5mm) HEHT BLACK (or red) belt 88A  Color: Black or red. For boxes up to 130 lbs (16 lbs/roller), maximum 180 lbs on 10 roller zones.  HEHT belts (Highly Elastic, High Tension) let you use one size for two different center distances (e.g., 3" and 3.5").  Easily moves 100 lb. boxes on 15 roller zones -- seven slave rollers on each side of the MDR. (One customer reports using them on 19 roller zones with 9 slaves on each side of the MDR, allowing our HEHT belts to compete with 2-rib poly-v belts at a much lower cost.) When stretched 24% to 30%, they neck down to fit into most 3/16" roller groves. HEHT belts actually conform to the whole groove, becoming oval in shape, so there is much greater surface contact, which means much greater slip resistance. Lower installation tension makes them relatively easy to install. See adjacent picture. Stretch: 15% to 30%. Usually we recommend 24% stretch.
  5. Long-Life .235” (6mm) HT GREEN belt 85A  Color: translucent green.  For boxes up to 120 lbs (15 lbs/roller).  Max 160 lbs. Stretch: 20%.
  6. Long-Life 1/4” (6.4mm) HT BLUE belt 85A  Color: translucent blue.  For boxes up to 140 lbs (17 lbs/roller).  Max 200 lbs. Used on flexible conveyors and on rollers that have sleeves. If belts protrude above the roller surface, sleeves will prevent boxes from colliding with belts. See adjacent picture. Stretch: 20%.
  7. Long-Life 5/16” (8mm) HT BLUE belt 85A  Color: translucent blue.  For boxes up to 200 lbs (26 lbs/roller). Max 230 lbs on level surface. Used primarily on rollers that have sleeves, especially on curves and spiral inclines. See adjacent picture. Stretch: 20%.

    Abuse Resistant, HT Rough Green Belts
    Jammed boxes will bring slave rollers and belts to a halt. As soon as a sensor detects a jam, the PLC must turn off its powered roller quickly -- within 4 seconds. Otherwise, the motorized drive roller will continue to turn under the jammed box, forcing the belts to slip and overheat. Such abuse will cause premature belt failure.

    Smooth belts have a high coefficient of friction (COF), so when forced to slip, they heat up and abrade or melt. Rough green belts have a low COF that lets them slip easier with less heat build up, so they can take more abuse. The trade off is that they slip too soon, so they cannot move heavy boxes like smooth belts. We recommend rough green belts in applications where boxes are light to moderate weight, and where PLC’s are set to power through jams -- or where there are no sensors to detect jams.

  8. Abuse Resistant 5mm HT Rough Green belt 88A   For boxes up to 60 lbs (7 lbs/roller max). Stretch 16%.
  9. Abuse Resistant 6mm HT Rough Green belt 88A   For boxes up to 70 lbs (8 lbs/roller max). These belts will stick up above regular grooves, causing boxes to skew. They are used on curves that have tapered sleeves which elevate boxes enough so they do not touch the belts. Stretch 16%.

    Round Belts or Flat Belts with Guard Sleeves
  10. 1/4" round belts can move up to 80 lbs per roller if zones are only three rollers long, i.e., one slave on each side of a motorized drive roller (green end cap). If the rollers do not have grooves, then 92A flat belt can be used and move up to 120 lbs per roller. Flat belts may need Guard Sleeves (blue) to prevent pallets from dislodging the belts. The red Tracking Sleeves prevent the flat belts from walking.

    Flat and Round Belts Combined
  11. A combination of flat and round belts can move very heavy loads by creating "pseudo motorized drive rollers". Adjacent is a powered roller zone with 14 rollers that can theoretically move heavy loads up to 80 lbs per roller -- or 180 lbs per roller if another set of flat belts is added to the other end of the rollers. If you specify grooves that are more than 1.25" apart, you can use wider flat belts that could theoretically move loads up to 400 lbs per roller. For more info Click here.

Longer Lasting Belts:  Nine years ago 40,000 of our 3/16 HT BLUE belts were installed in two large postal distribution centers. Since then, they have been running 24 hrs/day 7 days/week, and they are still going strong even though some tubs are over weight and have soft bottoms. Over 1 million are in service in postal distribution centers throughout the world. Also see "Longer Lasting Belts".

For the best in motorized drive roller belts, motorized roller belts, MDR belts, and Moller belts, insist on DuraBelt.

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