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V-Conform™ Reinforced O-ring Belts

(aka Ultra-Drive™ belts)

This belt is designed to compete with Fenner's Eagle® XLD O-ring. We believe our V-Conform belt (aka Ultra-Drive Belt) is much better because it delivers the claims that XLD O-ring fails to provide. See Eagle XLD O-ring Review.

V-Conform Reinforced O-ring Belts (aka Ultra-Drive Belts)

V-Conform Reinforced O-ring Belts

(aka Ultra-Drive Belts)


Finger Guards Required

Finger Guards Required*


DC Amps Compared

DC Amps Compared

After 3 days of continuous running 24/7 at low speed (115 ft/min) on a ten roller zone powered by an MDR with a PLC that has a maximum continuous current rating at highest speed of 2.8 amps


MDR Current vs rollers

Rollers vs MDR Current


New V-Conform Reinforced O-ring belts
 are Bi-Modulus (rubber reinforced with elastic "stretchy" nylon) so they provide greater tension than solid polyurethane belts, letting you move heavier boxes, faster and with longer zones.

Conforms to grooves:
 V-Conform belts have soft tiny ribs that conform to standard 3/16" roller grooves so they can replace round elastic belts, while providing as much grip and tension as two rib (2PJ) poly-v belts.

Ultra High Tension = Finger Guards:
 Like poly-v belts, XLD O-rings and chains, V-Conform belt's tension is so high that they create pinch points that require finger guards (safety guards) where personnel work within reach of boxes on conveyors. Regardless of what Fenner claims, they are NOT "drop in replacements" in most applications. Moreover, Finger Guards are expensive and need to be a much longer, 4.5" (114mm), than poly-v endcap finger guards. They require drilling two holes in the frame for each guard.

No-Stretch belts stress MDRs:
 Idler (slave) rollers are not precision rollers because they can be slightly bowed, elliptical (un-round) and/or have shafts slightly off center, so they act like small cams that wobble slightly with every revolution. No-stretch belts, like Eagle XLD O-rings, transmit that wobble directly to MDR motors, creating current spikes that hammer, overheat and stress MDRs, as shown by the orange, high current spikes on the adjacent graph. This causes XLD O-rings to waste energy and reduce MDR lifespan**.

V-Conform belts protect MDRs:
 Like solid polyurethane belts, V-Conform belts stretch (up to 7%) and relax to absorb cam shocks, so they reduce current surges and help protect MDRs, as shown by the green, milder current spikes on the adjacent graph.

V-Conform belts save Energy and MDRs:
 Compared to XLD O-rings, V-conform belts cut energy consumption nearly in half and help prevent MDRs from overheating. When an MDR overheats for more than a few minutes, thermistors shut it down until it cools. Unfortunately, thermistors only work for a limited number of times, e.g. 30 incidents. When that limit is reached, they burn out. If the one inside the MDR burns out, the MDR is usually not repairable.

Prevent bearing and shaft hole wear:
 V-conform stretchy belts help prevent bearing and shaft hole wear caused by no-stretch belts and wobbly rollers that hammer bearings and shaft holes.

Wipe away dust, prevent slipping:
 V-Conform belt's tiny ribs open and close with each rotation, wiping dust out of roller grooves. Helps prevent slipping.

Easier to Install:
 Center distances between rollers have tolerances on the plus-side that make no-stretch belts extremely difficult to install. Stretchy V-Conform belts overcome that problem, regardless of tolerance range. They stretch and conform.

Powers longer zones:
 Since V-Conform belts use less energy, they can power up to 30 rollers without exceeding the high speed current rating. See green line in adjacent graph.

Anti-static:
 Unlike XLD belts, V-Conform belts are anti-static.

Test results to date
:   V-Conform belts are new. During the last 11 months, conveyor manufacturers and Dura-Belt have been testing V-Conform. Recently one customer began supplying them on its new conveyors with single unit multi-finger-guards that extend through slots in its frames. The belts at Dura-Belt have been running 24/7 at high speed (200 ft/min), equivalent to 3.7 years of 40 hour weeks. Narrow grooves on our 15 year old Itoh Denki MDR slightly pinched and abraded one edge of one V-Conform belt. It was still running and did not stick up above the roller's surface like XLD O-rings, but it was a concern so we replaced it with our 0.216" 88A HEHT round belt. New Itoh Denki MDRs have slightly wider grooves so customers have not experienced any problem with V-Conform belts.

V-Conform belts are highly slip resistant. When we grab the end roller, stopping its rotation, none of our V-Conform belts slip and the MDR stalls (stops rotating). This V-Conform video shows that V-Conform belts do NOT slip. Compare it to this XLD O-ring video. It shows that XLD O-rings slip like when boxes jam or accumulate. Such slipping means that XLD O-rings can overheat, abrade and fail prematurely just like traditional O-ring belts. Non-stretch XLD O-rings provide excessive tension that can damage MDRs and bearings, but their slipping means that they have a much lower coefficient of friction than V-Conform belts. This means that XLD O-rings should not be able to transfer nearly as much power as claimed, while V-Conform belts will transfer such power easily without slipping so they are much more efficient.

Incidentally, all our MDRs driving V-conform belts are running warm to the touch, not overheated like MDRs driving XLD O-rings.

The V-Conform belts on our new Itoh Denki MDR do not show any abrasion. It is difficult to accurately measure the MDR's slightly tapered groove width, but the new one has grooves that appear to be a tiny bit wider. Nevertheless, it still has very tiny fillets on the groove edges that are much smaller than on idler rollers. Unlike XLD O-rings, V-Conform belts do not ride on fillets (rounded edges) so Itoh's slightly wider groove may eliminate the problem for our belt. V-conform belts do not need to grip fillets because their tiny conforming ribs grip the rollers so well that grasping the zone's end roller stalls the MDR, bringing it to a complete stop.

PulseRoller's MDRs appear to have similar narrow groves with tiny fillets like Itoh Denki's so V-Conform may have the same problem on them unless the new ones are slightly wider, which appears to be the case. Interroll's MDR grooves look like the wide grooves and fillets found on idler (slave) rollers so V-Conform should have no problem on Interroll's MDR, as well as on motors under rollers (e.g. pancake and E24 motors) that have wide grooved pulleys.

Curve Test:
 We tested V-conform belts on conveyor curves and skews. They abrade so they should not be used on curves or skews.

**MDR lifespan and cost:
 Unfortunately, there are no free lunches. Most MDRs and pancake motors are warranted for "normal and proper use". No-stretch Eagle XLD O-rings powering wobbly idler (slave) rollers can hammer and overheat MDRs so they should not be categorized as "normal use". This means XLD O-rings may reduce MDR lifespan and require replacement more often. Since MDRs cost more than expensive no-stretch XLD O-ring belts, Eagle XLD O-rings may not save money in the long run and cost considerably more than V-Conform belts or polyurethane round belts.

V-Conform Advantages:
  1. Moves heavier boxes, faster and on longer roller zones than XLD O-rings and polyurethane o-ring belts (PU belts).

  2. Replace 2 rib poly-v belts without needing poly-v endcaps by installing them in standard round grooves on inexpensive, non-precision idler rollers - thereby significantly reducing total costs.

  3. "Drop in replacements" for PU belts in areas where employees are restricted from proximity to conveyors that use V-Conform belts, or where these belts are located out of reach, like deep inside diverters.

  4. Potential longer life that PU belts, thereby reducing maintenance costs. Time will tell.

  5. If allowed to rest (not run continuously), like 2 seconds on and 1 second off, they can move heavier boxes (perhaps up to 320 lbs) at higher speeds while protecting MDRs from overheating and shut downs. This helps moderate electricity costs and protect MDR lifespan.

  6. Greatly increases drive force in critical applications like merges and squaring boxes for robots that stack them on pallets.

  7. Due to minimal belt creep, there is virtually no noticeable reduction in box speed at zone end.

  8. Works over wider temperature range than PU belts, -22°F to 176°F (-30°C to 80°C).

  9. Our low cost molds are available to make different lengths in 6 weeks so special lengths are no problem.

  10. Higher coefficient of friction resists slipping better than XLD O-rings and PU belts.

V-Conform Disadvantages:
  1. Costs more than PU belts.

  2. Increases electricity costs by 30%.

  3. We have not tested this yet, but it will probably use more energy than poly-v belts.

  4. When moving 15 or more rollers continuously at high speed, it may require a larger power supply.

  5. Requires extra long 4.5" (114mm) finger guards where employees have unrestrained access to conveyors.

  6. Increases labor costs to install and remove finger guards where they are required. Finger guards must be installed after installation of V-Conform belts and removed before replacing V-conform belts.

  7. Requires additional holes in conveyor frames to mount finger guards, plus a screw.

  8. Will abrade and not work long on curves and skewed rollers.

  9. Not green: Neither biodegradable nor recyclable like PU belts.

*Finger guards are not required in areas that restrict employee access or when belts are out reach buried inside a unit like a diverter.
Eagle® is a registered trade mark of Fenner Drives.
V-Conform is a trade mark of Dura-Belt, Inc., March-20-2023.

Special thanks for excellent technical help, priceless knowledge and conveyor parts furnished by QCON-24

For the best in V-Conform Reinforced O-ring belts and Reinforced belts, insist on Dura-Belt.

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