SAE J431 Grade Brake Discs — Bulk Supply G3000 Gray Iron Automotive Brake Rotors

High carbon brake disc
Automotive brake disc factory
High carbon brake disc
Automotive brake disc factory

CORINTH SAE J431 Grade Brake Discs | Bulk Supply G3000 Gray Iron Automotive Brake Rotors - KLT325490

1. SAE J431 Grade G3000 Material Specification: Manufactured from gray cast iron conforming to SAE J431 Grade G3000, the globally recognized automotive brake rotor material standard specifying minimum tensile strength of 200 MPa (30,000 psi) and consistent graphite microstructure for reliable braking performance.

2. Verified Material Quality & Traceability: Every production batch is tested for tensile strength, hardness, chemical composition and microstructure to verify compliance with SAE J431 G3000 requirements, with material test reports provided to wholesale customers for quality documentation and regulatory compliance.

3. Bulk Supply for High-Volume Distribution: Structured for high-volume bulk supply with consistent material quality across production runs, enabling distributors to confidently supply SAE-specification rotors to professional workshops, fleet operators and retail customers who require documented material compliance.

4. Stable Friction & Thermal Performance: G3000 gray iron's flake graphite microstructure provides excellent thermal conductivity, stable friction coefficient and good wear resistance, delivering consistent braking performance and long service life that matches original equipment rotor material standards.

5. IATF 16949 Certified Production & Zinc Coated: Manufactured in IATF 16949 certified facilities with full process control and 100% dimensional inspection, with anti-corrosion zinc coating on all non-friction surfaces for extended service life and clean appearance.


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  • Product Description

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  • Qualification Certification

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CertificationsIATF 16949, R90
TypesSolid Disc, Ventilated Disc, Drilled Disc, Slotted Disc, Drilled & Slotted Disc
MaterialsCast Iron G3000, High Carbon Alloy
Part Number

OE#LR084067 / LR161897

BrandCORINTH/Support brand customization
Vehicle CompatibilityLand Rover Discovery 5  / Range Rover 4  / Range Rover Sport 
LocationBackboard
Product AttributesMiddle hole diameter:79 mm
External diameter:325 mm
Pitch diameter: 120 mm
Overall height:49 mm
Brake pad thickness:25 mm
Minimum thickness:23 mm
Number of Bolt Holes:5

Product Overview

CORINTH SAE J431 Grade G3000 brake discs are manufactured to the globally recognized SAE (Society of Automotive Engineers) J431 material standard for automotive gray iron brake components. G3000 is the most widely specified brake rotor material grade in the global automotive industry, used by original equipment manufacturers and aftermarket producers alike. These rotors provide distributors with a material-compliant, fully documented product that meets the technical expectations of professional buyers and quality-conscious markets worldwide.

Core Material & Quality Advantages

· SAE J431 G3000 Material Compliance: SAE J431 is the standard specification for automotive gray iron castings used in brake drums and discs, and Grade G3000 specifies a minimum tensile strength of 200 MPa (approximately 30,000 psi, hence the designation G3000) along with requirements for chemical composition, hardness and microstructure. CORINTH G3000 rotors are cast from iron formulated to meet this specification, with carbon content in the flake graphite range that provides the thermal and friction properties essential for brake rotor applications. Full material compliance means these rotors match the material standard used by original equipment manufacturers, ensuring equivalent performance and durability.

· Batch-Level Material Verification & Traceability: Every batch of CORINTH G3000 brake rotors undergoes material verification testing including tensile strength testing (to confirm minimum 200 MPa), Brinell hardness testing (typically 180–240 BHN range per G3000), spectroscopic chemical composition analysis (carbon, silicon, manganese, phosphorus, sulfur content) and metallographic microstructure examination (to verify Type A flake graphite distribution). Test reports are retained with full batch traceability and provided to wholesale customers on request. This documentation is valuable for distributors supplying to regulated markets, fleet operators with procurement standards, and customers who require material compliance verification.

· Consistent Performance from Controlled Material: The G3000 flake graphite microstructure provides inherent benefits for brake rotor applications: graphite flakes act as lubricants during braking to prevent pad squeal, the material dissipates heat effectively through its thermal conductivity, and it maintains dimensional stability through thermal cycling. By strictly controlling material composition and casting parameters, CORINTH ensures that every rotor delivers consistent friction behavior, predictable wear rates and resistance to thermal distortion — qualities that professional installers and fleet managers rely on.

Application & Supply Scope

· Material Standard: SAE J431 Grade G3000 gray cast iron (equivalent to ISO 185 Grade 200, EN-GJL-200, JIS FC200, GB HT200).

· Vehicle Coverage: Universal application across all major global vehicle brands — Japanese, German, American, Korean and Chinese passenger cars, SUVs, light trucks and commercial vehicles. 5,000+ SKUs available in G3000 material.

· Target Customers: Global automotive parts distributors, importers, wholesalers, fleet maintenance operators, fast-fit chains and retail parts buyers who specify or require SAE J431 G3000 material compliance.

· Documentation: Material test reports (MTR) per batch, SAE J431 compliance declaration, IATF 16949 quality certificate, dimensional inspection reports, ECE R90 certificates (where applicable), certificates of origin and full export documentation.

Quality Assurance & Certification

Manufactured in IATF 16949 and ISO 9001 certified facilities. Every production batch verified for SAE J431 G3000 material compliance with retained test samples. 100% dimensional inspection, dynamic balance verification and visual quality inspection on every rotor. Anti-corrosion zinc coating applied as standard. ECE R90 certification available for European market models. AMECA listing available for North American applications. Wholesale pricing, bulk supply terms and sample evaluation available for new distribution partners. Custom material grades (including high-carbon G3500 equivalent) available by special order for performance and heavy-duty applications.


Precision Manufacturing

Advanced CNC machinery and automated production lines deliver micron-level accuracy on every brake component, ensuring consistent fit and performance across the entire product range.

OE-Standard Quality Control

Every batch undergoes rigorous inspection — from raw material testing to final dimensional verification — matching original equipment specifications for reliability you can trust.

High-Efficiency Production Capacity

Streamlined workflows and smart factory scheduling enable large-volume order fulfillment without compromising lead times or product consistency.

Certified Compliance

Manufactured under IATF 16949 certified processes with ECE R90 and AMECA validated products, meeting global regulatory standards for safety and durability.

End-to-End Traceability

Full production data tracking from forging to packaging gives complete quality transparency and rapid issue resolution at every stage.



IATF 16949 Certified Production Manufactured in our IATF 16949 certified facility, every brake disc is produced under strictly controlled quality management systems aligned with global automotive standards.

Comprehensive In-Line Testing Each batch undergoes full-line inspection covering:

· Brinell hardness testing to verify material integrity and wear resistance

· Parallelism and thickness variation measurement for smooth, vibration-free braking

· Dynamic balance testing to eliminate judder at high speeds

· Salt spray corrosion testing on coated models for long-lasting surface protection

Global Regulatory Compliance Most mainstream vehicle applications are ECE R90 approved for the European market, with AMECA certification available on request to meet North American requirements.

Full Lot Traceability Complete production records are maintained for every manufacturing lot — from raw material sourcing through final packaging — enabling rapid identification and resolution at any stage.

Consistent Quality from Sample to Scale Rigorous sample validation protocols carry directly into mass production, ensuring the same performance and reliability are delivered across both prototype and high-volume orders.


Frequently Asked Questions

Q: What certifications do your brake discs have?

A: Our manufacturing facility operates under the IATF 16949 quality management system — the global automotive industry standard for quality and continuous improvement. The majority of our mainstream brake disc models are ECE R90 approved for the European market, and AMECA certification is available on request for North American applications. All test reports and certification documents are available for review upon inquiry.

Q: Do you offer OEM / private label service?

A: Yes, full OEM and private label solutions are available. We support custom logo laser engraving or printing, branded packaging design, custom part numbering, and tailored performance specifications — including friction material pairing, coating options, and dimensional fine-tuning. Our engineering team works directly with you from design review through first-article inspection to ensure your branded product meets your exact requirements.

Q: What is your minimum order quantity?

A: For stock models, the MOQ is just 20 pieces per size, making it easy to test market demand. Custom branded OEM orders start at 300 pieces per model. Mixed-container orders across multiple part numbers are also supported to help you optimize shipping costs and inventory breadth. Small trial orders are welcome for new customers.

Q: How do I find the correct brake disc model?

A: Simply send us any of the following: the OE part number, a competitor's cross-reference number, or full vehicle details (brand, model, year, and chassis/VIN number). Our technical team will match it accurately against our comprehensive catalog database, typically within one working day, and confirm fitment including front/rear axle position and wheel size compatibility.

Q: What is the lead time for bulk orders?

A: Stock items ship within 7–10 working days from order confirmation. Mass production orders with custom branding or specifications typically require 20–30 working days, depending on order volume and complexity. Rush production can be arranged for urgent orders — please contact our sales team to discuss feasibility and any associated expediting fees.

Q: Can I get samples before placing a bulk order?

A: Absolutely. We encourage customers to evaluate quality firsthand. Samples are available for performance testing and dimensional verification; the buyer covers shipping costs, and samples dispatch within 3–5 working days. For confirmed bulk orders, sample fees can be credited back against your first purchase order as a goodwill gesture.

Q: What is your warranty policy?

A: We offer a 12-month / 50,000 km warranty against manufacturing defects under normal driving conditions and professional installation. This covers material defects, cracking, and abnormal wear attributable to production. Warranty claims are processed efficiently with photo documentation and lot number traceability, and replacement or credit is issued promptly upon verification.

Q: What types of brake discs do you offer?

A: Our range covers solid discs for standard passenger vehicles, vented discs for improved heat dissipation, drilled and slotted performance discs for sport and heavy-duty applications, and anti-rust Geomet-coated options for corrosion-prone markets. We also offer high-carbon and composite rotor constructions for premium and performance segments, ensuring a solution for every price point and regional requirement.

Q: What payment terms do you accept?

A: We support T/T (30% deposit, 70% balance before shipment), L/C at sight for larger orders, and Alibaba Trade Assurance for secure transaction protection. Established customers may apply for extended payment terms after a review of order history and credit standing.

Q: How are the brake discs packaged for shipping?

A: Each disc is individually wrapped in anti-rust paper or film, then placed in a neutral or custom-branded carton with protective foam inserts to prevent transit damage. Palletized shipping is standard for bulk orders, and we can accommodate custom packaging requirements such as barcoding, labeled SKUs, and retail-ready display boxes.

Q: Which markets do you currently supply?

A: We export to over 40 countries across Europe, North America, the Middle East, Southeast Asia, Africa, and Oceania. Our catalog covers European, American, Japanese, Korean, and Chinese vehicle makes, with regular updates to include the latest models and emerging market applications.



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+86 15318655181

Jacky.pan@corinthauto.com

+86 18153529719

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