Connection Flanges: Bolt Size M16-M24, Bolt Hole Quantity 8-16

Component Specifications

Definition

Connection flanges are structural components designed to connect individual segments of a mast or tower in industrial equipment. They serve as interface points where bolts or other fasteners secure adjacent sections, ensuring structural integrity, alignment, and load transfer. These flanges are critical for maintaining the stability and rigidity of the mast under operational stresses such as bending, torsion, and compression. Typically manufactured with high precision, they feature bolt holes, mating surfaces, and sometimes sealing elements to prevent misalignment and ensure reliable performance in demanding environments.

Working Principle

Connection flanges work by providing a flat, machined surface with bolt holes that align with corresponding holes on adjacent mast sections. When bolted together, the flanges create a rigid joint that distributes mechanical loads evenly across the connection. The principle relies on clamping force from bolts to generate friction and compressive stress, preventing relative movement between sections. Proper alignment is achieved through precision machining of mating surfaces and bolt patterns, ensuring the mast maintains its intended geometry and load-bearing capacity.

Materials

Common materials include carbon steel (e.g., ASTM A36, S355), stainless steel (e.g., AISI 304, 316), and alloy steel (e.g., 4140). Material selection depends on factors like load requirements, corrosion resistance, and environmental conditions. Specifications often include tensile strength (e.g., 400-700 MPa), yield strength, hardness (e.g., HRC 20-35), and surface treatments such as galvanizing or powder coating for corrosion protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bolt Size	M16-M24
Surface Finish	Ra 3.2 μm or better
Flange Thickness	20-40 mm
Bolt Hole Quantity	8-16
Flatness Tolerance	0.1 mm per 100 mm
Bolt Circle Diameter	200-500 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 4014, ISO 4017, DIN 931, DIN 933, ASME B18.2.1

Parent Products

This component is used in the following industrial products

Mast (Tower)

The vertical structural framework of a tower crane that provides height and stability.

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Inlet/Outlet Manifolds

Distribution components that manage fluid flow into and out of heating coil systems

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Engineering Analysis

Risks & Mitigation

Misalignment during assembly leading to stress concentrations
Bolt fatigue or loosening under dynamic loads
Corrosion compromising structural integrity
Improper torque application causing joint failure

FMEA Triads

Trigger: Incorrect bolt torque during installation
Failure: Joint loosening or bolt shearing under load
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications

Trigger: Corrosion due to environmental exposure
Failure: Reduced flange strength and potential cracking
Mitigation: Apply protective coatings and use corrosion-resistant materials like stainless steel

Trigger: Manufacturing defects in bolt holes or surfaces
Failure: Misalignment and uneven load distribution
Mitigation: Implement quality control checks and precision machining standards

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Bolt hole positional tolerance: ±0.5 mm; Surface flatness: within 0.1 mm per 100 mm

Test Method

Ultrasonic testing for material defects, torque testing for bolt tightness, and dimensional inspection using CMM (Coordinate Measuring Machine)

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.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Connection Flanges

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Longan Flange

Zhejiang, CN

Also makes: Pressure Vessel, Forged Steel Flange

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Soft Connection flanges”
View source page ↗ longanflange.com · recorded 2026-08-31

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Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

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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Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What is the primary function of connection flanges in a mast?

The primary function is to securely join mast sections, ensuring structural integrity, alignment, and efficient load transfer under operational stresses.

How are connection flanges typically installed?

They are installed by aligning bolt holes between flanges on adjacent mast sections, inserting bolts, and tightening them to a specified torque to create a rigid, load-bearing joint.

What factors influence material selection for connection flanges?

Factors include mechanical load requirements, corrosion resistance needs, environmental conditions (e.g., exposure to moisture or chemicals), and cost considerations.

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.

Connection Flanges