External Flange: Flange Diameter 20-200 mm

Component Specifications

Definition

An external flange is a critical component of industrial wire harness sealing grommets designed to create a secure, sealed interface between wire harnesses and equipment enclosures. It typically features a flat, circular mounting surface with bolt holes for attachment, working in conjunction with internal sealing elements to prevent ingress of dust, moisture, chemicals, and other contaminants while providing strain relief and mechanical protection for cables.

Working Principle

The external flange operates by creating a compression seal when mounted against an equipment surface. When bolts are tightened through the flange's mounting holes, it compresses the grommet's internal sealing elements against both the wire harness and the equipment panel, forming a tight barrier. This mechanical compression creates radial pressure that seals around individual cables while maintaining the integrity of the harness bundle.

Materials

Typically manufactured from engineering plastics (PA6, PA66, PBT, PVC) or metals (stainless steel AISI 304/316, aluminum alloys, galvanized steel) depending on application requirements. Plastic flanges offer corrosion resistance and electrical insulation, while metal flanges provide higher mechanical strength and temperature resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
IP Rating	IP65-IP69K
Flange Diameter	20-200 mm
Flange Thickness	3-15 mm
Temperature Range	-40°C to +120°C (plastic), -60°C to +400°C (metal)
Bolt Hole Diameter	M4-M12
Pressure Resistance	Up to 10 bar
Mounting Hole Pattern	Standardized (e.g., 4-hole, 6-hole)

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 9001, DIN 73378, ISO 14001, IEC 60529

Parent Products

This component is used in the following industrial products

Industrial Wire Harness Sealing Grommet

Rubber or plastic component that seals and protects wire harnesses passing through panels

View Product Details

Engineering Analysis

Risks & Mitigation

Improper torque application causing seal failure
Material incompatibility with chemicals
Thermal expansion mismatch
Galvanic corrosion in mixed-metal assemblies
Vibration-induced loosening

FMEA Triads

Trigger: Insufficient bolt torque during installation
Failure: Seal compression loss leading to environmental ingress
Mitigation: Implement torque-controlled installation procedures and regular inspection protocols

Trigger: Material degradation from chemical exposure
Failure: Flange cracking or deformation compromising seal integrity
Mitigation: Select chemically resistant materials and conduct compatibility testing

Trigger: Thermal cycling in extreme environments
Failure: Differential expansion causing seal gap formation
Mitigation: Use materials with matched thermal expansion coefficients and design with thermal compensation features

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.2 mm on critical dimensions, flatness within 0.1 mm across mounting surface

Test Method

IP ingress testing per IEC 60529, pressure testing, vibration testing per ISO 16750, material certification per RoHS/REACH

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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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of External Flange

Manufacturer profiles associated with External Flange.

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Frequently Asked Questions

What is the primary function of an external flange in wire harness sealing?

The primary function is to provide secure mechanical mounting while enabling compression sealing that protects wire harnesses from environmental contaminants and provides strain relief.

How do I select the right external flange material for my application?

Consider environmental factors (chemical exposure, temperature extremes), mechanical requirements (vibration, impact), regulatory standards, and compatibility with both the equipment panel and internal sealing elements.

Can external flanges be used in explosive atmospheres?

Yes, when certified accordingly. ATEX-certified flanges with proper sealing can be used in hazardous areas, but must be selected as part of a complete certified assembly.

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.

External Flange