Connecting Flange: Diameter Range 50 mm to 2000 mm

Component Specifications

Definition

A connecting flange is a flat, circular, or rectangular plate with evenly spaced bolt holes around its perimeter, designed to create a secure, sealed joint between two duct sections. It serves as an interface that allows for assembly, disassembly, and maintenance of ductwork while maintaining structural integrity and preventing air or material leakage in industrial applications such as HVAC, dust collection, and pneumatic conveying systems.

Working Principle

The connecting flange operates by aligning two duct sections and clamping them together using bolts through matching holes in the flanges. A gasket or sealant is typically placed between the flanges to ensure an airtight or leak-proof seal. The bolt tension creates compressive force, securing the joint and maintaining pressure integrity within the duct system.

Materials

Common materials include: carbon steel (ASTM A36, A105), stainless steel (304, 316), aluminum alloys (6061-T6), galvanized steel, and occasionally fiberglass-reinforced plastics for corrosive environments. Material selection depends on factors like temperature, pressure, corrosion resistance, and cost.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bolt Size	M8 to M24
Diameter Range	50 mm to 2000 mm
Surface Finish	Ra 3.2 μm to 12.5 μm
Pressure Rating	Up to 1.5 MPa (150 psi)
Flange Thickness	3 mm to 20 mm
Temperature Range	-40°C to 400°C
Bolt Hole Quantity	4 to 24 holes

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 7005-1, DIN 2633, ANSI/ASME B16.5, EN 1092-1

Parent Products

This component is used in the following industrial products

Duct Sections

Prefabricated modular segments of ductwork used to construct ventilation, air conditioning, or exhaust systems.

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Engineering Analysis

Risks & Mitigation

Improper bolt tightening can lead to leaks or joint failure
Material incompatibility may cause corrosion
Misalignment during installation can reduce efficiency
Gasket failure under high temperature or pressure

FMEA Triads

Trigger: Insufficient bolt torque during installation
Failure: Leakage at the flange joint, leading to system pressure loss and contamination
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications; implement regular inspection schedules

Trigger: Corrosion due to exposure to harsh chemicals or moisture
Failure: Structural weakening and eventual rupture of the flange
Mitigation: Select corrosion-resistant materials (e.g., stainless steel); apply protective coatings; conduct periodic corrosion checks

Trigger: Gasket degradation from high temperature or pressure
Failure: Loss of seal integrity, causing leaks and system inefficiency
Mitigation: Use high-temperature gaskets (e.g., graphite, PTFE); monitor operating conditions; replace gaskets as per maintenance intervals

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerances per ISO 2768-m for general dimensions; bolt hole positional tolerance within ±0.5 mm; flatness tolerance of 0.1 mm per 100 mm diameter

Test Method

Pressure testing per ISO 5208: Hydrostatic test at 1.5 times maximum working pressure; leak detection using bubble test or pressure decay method; visual inspection for surface defects and alignment

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

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

Manufacturers of Connecting Flange

Manufacturer profiles associated with Connecting Flange.

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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 is the primary function of a connecting flange in duct systems?

The primary function is to provide a secure, sealed, and removable connection between duct sections, allowing for easy assembly, maintenance, and pressure integrity in industrial ventilation and material handling systems.

How do I select the right material for a connecting flange?

Select based on operating conditions: use carbon steel for general applications, stainless steel for corrosion resistance, aluminum for lightweight needs, and consider temperature, pressure, and environmental factors like humidity or chemicals.

What standards apply to connecting flanges?

Common standards include ISO 7005-1 for dimensions, DIN 2633 for pressure ratings, and ANSI/ASME B16.5 for pipe flanges, ensuring compatibility and safety in industrial use.

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.

Connecting Flange