INDUSTRY COMPONENT

Mounting Flange

Mounting flange for precision alignment and secure attachment of bearings in CNC machined aluminum housings.

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Component Specifications

Definition
A mounting flange is a critical interface component in aluminum CNC machined bearing housings, designed to provide precise radial and axial positioning of bearings while ensuring secure mechanical attachment to adjacent structures. It features machined surfaces with tight tolerances for bearing seat alignment, bolt hole patterns for fastening, and often includes sealing surfaces or lubrication channels. This component distributes mechanical loads, maintains bearing preload, and prevents misalignment in rotating machinery applications.
Working Principle
The mounting flange operates by creating a rigid, precisely machined interface between the bearing outer race and the housing structure. It uses mechanical fastening (typically bolts) to apply clamping force, ensuring the bearing remains fixed in its designated position. The flange's geometry controls bearing alignment through reference surfaces, while its stiffness prevents deformation under operational loads. In aluminum housings, it compensates for thermal expansion differences between materials and provides corrosion-resistant mounting points.
Materials
Typically manufactured from 6061-T6 or 7075-T6 aluminum alloy for CNC machined versions, offering high strength-to-weight ratio, excellent machinability, and good corrosion resistance. Alternative materials include cast aluminum alloys (A356) for high-volume production or stainless steel (304/316) for corrosive environments.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Weight0.1-2.0 kg (depending on size)
Hardness75-85 HRB for aluminum alloys
Bolt SizeM6-M12
Outer Diameter50-200 mm (varies by bearing size)
Surface FinishRa 1.6-3.2 μm for bearing seats
Bolt Hole Quantity4-8 holes (typically)
Flatness Tolerance0.02-0.05 mm
Bolt Circle DiameterStandardized to bearing housing dimensions

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 1132-1, DIN 5412, ISO 286-2, DIN 718-2

Parent Products

This component is used in the following industrial products

Aluminum CNC Machined Bearing Housing

This CNC machined aluminum component is designed to securely mount and protect bearings in mechanical assemblies.

View Product Details

Aluminum Die Casting Connector Housing

This aluminum die-cast connector housing is a precision component designed to encase and protect electrical or electronic connector assemblies.

View Product Details

Polycarbonate Injection Molded Lens Housing

This precision injection molded component is designed to house and protect optical elements in industrial applications.

View Product Details

Engineering Analysis

Risks & Mitigation
  • Improper bolt torque causing uneven clamping
  • Thermal expansion mismatch with steel bearings
  • Galvanic corrosion when coupled with dissimilar metals
  • Machining errors leading to misalignment
  • Fatigue failure under cyclic loads
FMEA Triads
Trigger: Insufficient bolt torque during assembly
Failure: Bearing loosening and vibration
Mitigation: Use calibrated torque wrenches and follow specified torque values; implement torque verification procedures
Trigger: Thermal expansion differential between aluminum flange and steel bearing
Failure: Bearing preload loss or excessive preload
Mitigation: Design with appropriate clearance/tolerance for thermal expansion; use temperature-stable lubricants
Trigger: Surface corrosion on aluminum flange
Failure: Reduced clamping force and misalignment
Mitigation: Apply protective coatings (anodizing, powder coating); use corrosion-resistant alloys in harsh environments

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Geometric tolerances per ISO 1101:2017; dimensional tolerances per ISO 286-1:2010; typically IT7-IT8 for critical dimensions
Test Method
Dimensional verification using CMM; surface finish measurement with profilometer; flatness testing with optical flats or laser interferometry; hardness testing per ASTM E18

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 Mounting Flange

Manufacturer profiles associated with Mounting 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 mounting flange in bearing housings?

The primary function is to provide precise alignment and secure mechanical attachment for bearings within the housing, ensuring proper load distribution and preventing misalignment during operation.

Why is aluminum commonly used for CNC machined mounting flanges?

Aluminum offers excellent machinability, good strength-to-weight ratio, corrosion resistance, and thermal conductivity, making it ideal for precision components in bearing housings where weight reduction and heat dissipation are important.

How do mounting flanges prevent bearing misalignment?

Through precisely machined reference surfaces with tight flatness and perpendicularity tolerances, which ensure the bearing outer race seats correctly and maintains alignment under operational loads and thermal cycling.

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.

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