Ring Gear Flange: Bolt Size M10-M14, Flange Thickness 15-25 mm

Component Specifications

Definition

The Ring Gear Flange is a critical interface component in automotive differential systems that serves as the mounting surface and torque transfer point between the ring gear and differential case. It features precisely machined bolt holes, pilot surfaces, and mounting faces that maintain concentricity and perpendicularity between the ring gear and differential housing. This component must withstand high torsional loads, shear forces, and thermal cycling while maintaining dimensional stability throughout the vehicle's service life.

Working Principle

The flange operates by providing a rigid, precisely aligned connection between the ring gear and differential case. When torque is applied through the drive pinion to the ring gear, the flange transmits this rotational force to the differential case while maintaining proper gear mesh alignment. The bolt pattern distributes clamping forces evenly, while the pilot diameter ensures concentric alignment to prevent runout and vibration.

Materials

Typically forged or machined from SAE 8620 or SAE 4140 alloy steel, heat-treated to 28-32 HRC for optimal strength and wear resistance. Alternative materials include ductile iron (ASTM A536) for cost-sensitive applications or micro-alloyed steels for weight reduction.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bolt Size	M10-M14
Bolt Quantity	8-12
Surface Finish	Ra 1.6-3.2 μm
Flange Thickness	15-25 mm
Runout Tolerance	0.08 mm
Flatness Tolerance	0.05 mm
Bolt Circle Diameter	150-250 mm
Pilot Diameter Tolerance	H7/h6

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 286-2, DIN 3961, SAE J429, ISO 2768-mK

Parent Products

This component is used in the following industrial products

Differential Case

The housing that encloses and protects the differential gears and components within a front differential assembly.

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Engineering Analysis

Risks & Mitigation

Bolt hole elongation under cyclic loading
Surface fretting corrosion
Fatigue cracking at stress concentrations
Thermal distortion affecting alignment
Improper bolt torque leading to joint failure

FMEA Triads

Trigger: Insufficient bolt torque or uneven tightening sequence
Failure: Joint slippage leading to fretting wear and eventual catastrophic failure
Mitigation: Implement torque-angle tightening procedures with calibrated tools and verify with ultrasonic bolt tension measurement

Trigger: Material inclusions or improper heat treatment
Failure: Fatigue cracking originating from subsurface defects
Mitigation: Implement 100% magnetic particle inspection and batch material certification to ASTM A388 standards

Trigger: Thermal cycling in extreme operating conditions
Failure: Differential thermal expansion causing loss of preload and misalignment
Mitigation: Design with matched thermal expansion coefficients and implement thermal barrier coatings where applicable

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 1101, dimensional tolerances per ISO 286-2, surface finish per ISO 1302

Test Method

Dimensional verification with CMM, surface hardness testing per ASTM E18, magnetic particle inspection per ASTM E1444, torque-to-yield testing per SAE J1740

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 Ring Gear Flange

Manufacturer profiles associated with Ring Gear 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 ring gear flange?

The primary function is to provide a rigid, precisely aligned connection between the ring gear and differential case, ensuring proper torque transfer while maintaining gear mesh alignment under varying load conditions.

Can ring gear flanges be interchanged between different vehicle models?

No, they are typically model-specific due to variations in bolt patterns, pilot diameters, and thickness requirements. Always consult manufacturer specifications before attempting interchange.

What are common failure modes for ring gear flanges?

Common failures include bolt hole elongation, surface fretting, pilot diameter wear, and fatigue cracking at stress concentration points, often caused by improper torque, misalignment, or material defects.

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.

Ring Gear Flange