Helical Screw (Auger): Capacity Up to 300 m³/h

Component Specifications

Definition

The helical screw, commonly known as an auger, is a critical component of screw conveyors consisting of a central shaft with a continuous helical flighting (blade) wrapped around it. It operates by rotating within a stationary housing (trough or tube), creating a positive displacement action that pushes granular, powdered, or semi-solid materials along the conveyor's length. The design parameters—such as pitch, diameter, flight thickness, and helix angle—determine the conveying capacity, efficiency, and material handling characteristics. It is engineered to handle various bulk densities and flow properties while minimizing degradation and segregation of materials.

Working Principle

The helical screw operates on the principle of Archimedes' screw, where rotation of the helical blade generates axial thrust. As the screw rotates, material is trapped between the flights and the housing wall, causing it to slide along the helical path. The inclined surface of the flighting converts rotational motion into linear material displacement, with the pitch defining the advance per revolution. This creates a continuous, controlled flow of material from the inlet to the discharge point, with performance influenced by screw speed, fill level, and material properties like cohesion and abrasiveness.

Materials

Typically manufactured from carbon steel (e.g., ASTM A36), stainless steel (e.g., 304 or 316 for corrosion resistance), or hardened alloys for abrasive applications. Surface treatments may include hard-facing (e.g., tungsten carbide overlay), galvanization, or powder coating to enhance wear resistance and durability. Flight thickness ranges from 3 mm to 12 mm depending on load and abrasion requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pitch	0.5-1.5 times diameter
Capacity	Up to 300 m³/h
Diameter	100-600 mm
Helix Angle	15-30 degrees
Rotation Speed	10-150 RPM
Shaft Diameter	50-200 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 7119, DIN 15262

Parent Products

This component is used in the following industrial products

Screw Conveyor

A mechanical conveying device that uses a rotating helical screw blade to move bulk materials horizontally or at an incline.

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Engineering Analysis

Risks & Mitigation

Material degradation due to shear
Wear from abrasive materials
Overloading causing shaft deflection or failure
Corrosion in humid or chemical environments

FMEA Triads

Trigger: Abrasive material contact
Failure: Excessive flight wear leading to reduced capacity and efficiency
Mitigation: Use hardened materials or wear-resistant coatings; implement regular inspection and maintenance schedules

Trigger: Over-torque or jamming
Failure: Shaft bending or fracture, motor burnout
Mitigation: Install torque limiters or shear pins; ensure proper material sizing and feed control

Industrial Ecosystem

Compatible With

Screw conveyors, auger feeders, mixing screws, extruders

Typical Suppliers & Equivalents

Martin Sprocket & Gear, Screw Conveyor Corporation, Flexicon, WAM Group

Compliance & Inspection

Tolerance

Dimensional tolerances per ISO 2768-m; concentricity within 0.5 mm per meter length

Test Method

Performance testing per ISO 7119 for capacity and power consumption; non-destructive testing (NDT) for weld integrity

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Helical Screw (Auger)

Manufacturer profiles associated with Helical Screw (Auger).

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Frequently Asked Questions

What factors determine the pitch of a helical screw?

Pitch is determined by material characteristics (e.g., flowability, density), required throughput, and conveyor inclination. Standard pitch equals screw diameter, but may be reduced for inclined conveying or increased for free-flowing materials.

How does screw diameter affect conveying capacity?

Larger diameters increase cross-sectional area and volumetric capacity, but also require higher torque and power. Capacity is proportional to the square of the diameter, assuming constant speed and fill level.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Helical Screw (Auger)