Helical wire core: Temperature Range -40°C to 120°C

Component Specifications

Definition

The helical wire core is a critical structural element in flexible duct systems, consisting of a continuous steel wire formed into a precise helical coil. This component provides radial strength to prevent duct collapse under negative pressure while maintaining flexibility for installation around obstacles. The wire's pitch, diameter, and material properties determine the duct's minimum bend radius, pressure rating, and durability. In HVAC applications, it ensures consistent airflow by maintaining cross-sectional area during bending and compression.

Working Principle

The helical wire core operates on the principle of spring mechanics, where the coiled structure provides both flexibility and elastic recovery. When the duct bends, the wire coils compress on the inner radius and expand on the outer radius, maintaining structural integrity through distributed stress. The helical shape creates continuous support around the duct circumference, preventing local buckling while allowing axial compression and extension during installation.

Materials

Galvanized steel wire (ASTM A641 Class 1), 1.2-2.0mm diameter, tensile strength 350-550 MPa. Alternative materials include stainless steel (AISI 304) for corrosive environments or aluminum for lightweight applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Coil Pitch	12mm
Wire Diameter	1.5mm
Pressure Rating	±2500 Pa
Temperature Range	-40°C to 120°C
Minimum Bend Radius	100mm

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 7231, DIN 24194, SMACNA HVAC Duct Construction Standards

Parent Products

This component is used in the following industrial products

Flexible Duct

A flexible, bendable duct used in HVAC systems to connect rigid ductwork sections and navigate around obstacles.

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Engineering Analysis

Risks & Mitigation

Wire fatigue from cyclic bending
Corrosion in humid environments
Improper installation causing kinking
Electrical conductivity requiring grounding in some applications

FMEA Triads

Trigger: Material fatigue from vibration
Failure: Wire fracture leading to duct collapse
Mitigation: Regular inspection, vibration dampening mounts, proper duct support spacing

Trigger: Chemical corrosion
Failure: Reduced structural integrity and potential particulate contamination
Mitigation: Material selection based on environment, protective coatings, regular cleaning

Trigger: Over-bending during installation
Failure: Permanent deformation restricting airflow
Mitigation: Training on minimum bend radius, use of installation guides, proper duct routing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Wire diameter ±0.1mm, coil pitch ±1mm, concentricity within 2mm

Test Method

ASTM E8 tensile testing, cyclic bend testing per ISO 7231, pressure decay testing

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 wire core

Manufacturer profiles associated with Helical wire core.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What determines the minimum bend radius of a helical wire core?

The minimum bend radius is determined by wire diameter, coil pitch, and material elasticity. Thicker wires with tighter pitches allow smaller bend radii without permanent deformation.

Can helical wire cores be repaired if damaged?

Localized damage can sometimes be repaired with specialized wire splicing, but extensive damage typically requires complete duct replacement to maintain pressure integrity.

How does wire coating affect performance?

Galvanization provides corrosion resistance for standard applications, while polymer coatings reduce friction and noise. Stainless steel offers superior corrosion resistance for harsh environments.

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 wire core