Convey Bulk Material from one Point to Another Using the Industry’s Most Simple, Effective, and Versatile Conveying Method

Hapman Flexible Screw Conveyor

The flexible screw conveyor has been used in the dry processing industry for decades.

The reliable, yet simple and low maintenance flexible screw conveyor uses a single moving part to effectively convey dry material from one point to another. These conveyors are versatile, allowing for horizontal, vertical, and degreed bend applications.

The best conveying value

Engineered for batch, intermittent and continuous conveying - of free - and non-free-flowing bulk materials. An economical solution for conveying powders, crystals, pellets, friable material, flakes, granules and much more.

Convey Horizontally or Vertically – The flexible outer tubing and auger allow for easy maneuvering into elevated hoppers and bending around other equipment and obstacles.

Simple, yet rugged construction keeps costs low, reliability high - A helicoid screw rotates inside a fixed tube. Fewer components minimize maintenance. The conveyor’s standard stainless steel construction stands up to a continuous flow of abrasive materials. (Carbon steel and polyethylene models also available.)

Convey materials over distances up to 80 ft - (24.4 m) and discharge heights up to 40 ft (12.2 m). An optional mobile base provides a discharge height of 12 ft (3.66 m).

Easy to clean - Disassemble conveyor in 5 minutes for thorough washdowns.

The Hapman Helix® – Available in 48 hours or less

QuickShipThe Hapman Helix® Flexible Screw Conveyor is designed to offer customers an economical conveying method that can be applied to most types of dry material conveying applications and can be selected, ordered, and shipped quickly. For this reason, we offer a Quick Ship program for standard Helix® Units, for unit selection, ordering and shipping in 48 hours or less.

next: Operation of the Flexible Screw Conveyor

The Flexible Screw Feeder Operation

The flexible screw conveyor operation begins with product entering the sealed tube as the auger rotates. The shape, design style, size, and length of the auger are factors selected for each application. The screw conveyor is typically mounted to a hopper for easy loading of material. A single motor drives the auger rotation allowing the material to be pulled through the enclosed tube. The helixcoid design of the auger effectively conveys a wide range of materials from powder, to granular, to larger particles.

The Hapman Helix® is a good conveying option when your application requires:

  • Gentle product handling
  • Greater hygiene
  • Easy to clean
  • Total containment
  • Dust-free
  • Constant remixing
  • Low cost
  • Low maintenance
  • Capacity ranges from 15 ft3/hr to 18000 ft3/hr

next: Features of the Flexible Screw Conveyor


  • Disassemble conveyor in minutes for cleaning with exclusive T-handle couplings.
  • Quick Release options for easy cleaning and product change over
  • Economically convey bulk powders and solids up to 25 cfm (.708cmm).

Detailed Features

Click images to expand and see details

next: Flexible Screw Conveyor Models

Standard Helix® Units - The Best Conveying Value

Flexible Screw ConveyorThe Helix® Flexible Screw Conveyor comes in many standard sizes to meet your material movement needs. Ranging in capacity from 15 cfh to 1800 cfh with the ability to move material up to 80 ft, the Helix® is versatile, cost-effective, and easy to clean.

  • Batch or intermittent and continuous conveying – Designed to handle
  • Wide Range of Auger Types – Proving you with optimum conveying and control
  • Choice of Hopper Types - Stainless and Poly Hoppers are available in our standard models

Helix® Quick Ship Program

QuickShipWe offer a Quick Ship program for the standard Helix®; for unit selection, ordering and shipping in 48 hours or less. Convey
0.5 to 1.5 ft3/min. in a completely enclosed conveyor.

  • Several Auger Types Available
  • Multiple Conveyor Casing Sizes Available - 3", 4", 5" diameter
  • Standard Poly or Ribbon Agitator Hopper - The polyethylene option is lightweight and easy to maintain. A ribbon agitator hopper is ideal for material types that are high-moisture and/or difficult to move. See image to the right.

Hi/Lo Helix® Flexible Screw Conveyors

Easily tilt down the conveyor for efficient batch changes and cleaning. No need for ladders, lifts, or a maintenance crew. The switch operated electric motor gives one operator the ability to simply and easily lower the conveyor, remove the auger and change it or clean it. This ergonomic design keeps workers safely at ground level while providing maximum conveying options.

  • Efficient Change-over - Increase production time with quick batch changeovers
  • Easy to Clean - Reduce costs through efficient cleaning tear down time
  • Mobile Units Cut Costs - Lower equipment purchases with a mobile option that can be moved to point-of-use

The Hi/Lo Flexible Screw Conveyor is suitable for many applications including a sanitary option.

Horizontal Push Helix®

Your Best Choice for Controlled Material Flow

Push-HelixWhen your material movement needs require a controlled flow without measured output, the Horizontal Push Helix® is well suited for your needs. Our engineers developed this economical material delivery equipment out of growing industry demand for a simple, easy to use, material movement device that reliably transfers product from one location to another. The Horizontal Push Helix® reduces instantaneous material load, thus avoiding potential material clogging or back-up. The Push Helix® allows for gradually introduced product into a feed line, or other production equipment.

  • The horizontal push Helix® is designed for applications where a controlled material feed without a measured output requirement is best suited.
  • Auger Sizes range from 2.5” to 8”, carbon steel, UHWM (FDA), Poly, or Stainless Steel
  • 20:1 Turn down ratio
  • Economical, various models available for Quick Ship; 5 days or less

Custom Push Helix® 600 Series

The 600 Series Helix is suited for quickly and effectively emptying of storage totes or intermediate bulk containers (IBC’s). The Tri-clover inlet connection is housed under a protective cover. The cover slides to the side when the Push Helix is in use. The inlet is designed to mate with the discharge valve of the tote or IBC, signaling the valve actuator to open the valve. As the value opens material is automatically discharged into the screw conveyor. The conveyor delivers the product or ingredients to another conveyor, a mixing station, extruder, packaging line, or other process related area.

  • Fully automated
  • Sanitary design
  • Capable of discharging up to 8ft3/min
  • Suitable for any industry or application where material needs to be discharged from small storage totes

Sanitary and FDA/USDA Compliant Helix® Conveyors

Sanitary Grade Equipment and Components Engineered for Safe and Efficient Conveying

Helix - HiLo Sanitary

We have a broad range of sanitary options for our Helix® Flexible Screw Conveyor when sanitary requirements need to be met. When you need to move bulk dairy powders or other food grade product that has the potential to get stuck or trapped; our sanitary features will comply with FDA and USDA conveying and cleaning requirements. We can design equipment to meet all of the sanitary conditions that keep your facility food-safe and regulation compliant.

Access internal components quickly, easily. Quick-release tri-clover connectors let you dismantle the conveyor without tools so it's 100% open for cleaning or maintenance in a few minutes.

Meet dairy-grade standards on all product contact surfaces. Our Helix® is the industry's only flexible screw conveyor manufacturer listed by the USDA for Dairy Grading applications.

Sanitize all components to your stringent regulations.

next: Flexible Screw Conveyor Options


Hapman offers a wide range of auger styles and sizes to fit in casings 2 to 8 in diameter (5.08 to 20.32 cm). Each auger is specifically engineered to effectively move product depending on material type and operating conditions. Our application and engineering team will work with you to determine the best auger for your application.


  • Flat Wire: works well with fine powders; provides the highest conveyor capacity
  • Bevel Edge: use to transport sticky material
  • Heavy-Duty Square: for heavy, abrasive material
  • Round Wire: best for granular materials such as salt or sugar

A wide range of options and layouts

In addition to standard units, the Helix® comes with a wide range of options for easy implementation into specific plant applications; food grade, dairy grade, stainless steel hopper, TEFC motors, and portable units are available upon request.

The Helix is available in many configuration types.

Screw Conveyor Options and Paths

Additional detailed options

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next: Flexible Screw Conveyor Specifications

Conveyor Paths

A number of conveyor paths are available to ensure your material gets to where its needed. Combination paths are possible.

Screw Conveyor Options and Paths

Product Specifications

Series Model # 250 300 400 500 600 800
Casing (OD) 2.32”
(5.872 cm)
(7.518 cm)
(10.668 cm)
(11.938 cm)
(16.827 cm)
(21.907 cm)
Bend Radius 6’
(1.828 m)
(3.084 m)
(6.096 m)
Capacity1 15-45 cfh
(0.425 – 1.274 cmh)
30-70 cfh
(0.850 – 1.982 cmh)
60-240 cfh
(1.70 – 6.796 cmh)
120-360 cfh
(3.40 – 10.194 cmh)
120-600 cfh
(3.40 – 16.99 cmh)
360-1800 cfh
(10.194 – 50.97 cmh)
Stainless Polyethylene
Stainless Stainless Stainless Stainless
Food Grade Finish
(120 Grit)
Sanitary Grade Finish
(150 Grit)
USDA Dairy
Grade Finish
(180 Grit)
Hi/Lo Tilting
Optional Mobile
48-hour Quick Ship N/A Stainless
Stainless N/A N/A N/A

1 Based on free-flowing granular material. Actual capacity will vary with material characteristics.

next: Flexible Screw Conveyor Applications

Helix Application Examples

Our Helix® Flexible Screw Conveyor can be used in many versatile applications. Here are just a few examples of how the Helix® works to keep material moving effectively and keeps your plant safe, clean, and dust free.


Popcorn Packaging Line - Hapman P300 Helix® conveyor used to refill a Hapman supplied holding hopper above our customers popcorn packaging line. Our conveyor is being used as an intermittent refill device, sized to stay ahead of the packaging line, and works off form a high level sensor in the holding hopper that we are discharging into. Refilling to the high level sensor on demand as needed. This is a 3” conveyor and the refill rate was about 600 lbs/hour. Material conveyed was salt and popcorn, individually, not as a mix.


Salt Pellet Conveying - Food mfg company wanted to provide a way for their employees to feed their water softener tanks with salt pellets, these bags weigh about 80 lbs and the tank height is over 5 ft, so Hapman provided a 4” Helix® conveyor for dumping the salt pellets into the conveyor hopper at floor level, this portable conveyor could be rolled around and used at different tanks.


Building Material Conveying - A roofing manufacturer in Georgia needed a way to convey different color roofing granules into their mixer, so hapman provided a conveyor to feed the mixer, unload the mixer, and also send reclaim product back into the mixer to help minimize product loss. These are 3” conveyors with stainless steel tubes, and heavy duty square bar auger. The roof granules weighed about 120 lbs/cubic ft.


Industrial Material Conveying - Tire manufacturer needed a way to convey from their in house silos to a common batch hopper, Hapman provided our series 600 (6” diameter) Helix® conveyors with stainless steel components, complete with butterfly valves located at the conveyor discharge, each conveyor would batch a set amount into a common hopper for the ingredients required for making the tires in this plant. Average rate for these conveyors were about 6-8 cubic ft per minute. The materials conveyed included Tio2, Zinc Oxide, Carbon black, and Calcium Carbonate.

More examples of applications browse through our image gallery on the right.