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Help Center40Cr Internal Ring Gear for Gearbox DIN 6 Accuracy Heat Treated 1 Year Warranty
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Henan San Kuang Machinery Technology Co., Ltd. proudly presents our 40Cr Internal Ring Gear for Gearbox – DIN 6 Accuracy, Heat Treated, with a 1-Year Warranty. As a dedicated manufacturer with a 10,000-30,000 m² factory and 51-100 skilled employees, we engineer precision components that deliver reliable performance in demanding transmission applications. This ring gear combines the strength of 40Cr alloy steel with controlled heat treatment to achieve excellent wear resistance and dimensional stability. Whether you need to upgrade your existing gearbox or design a new powertrain, our internal ring gear offers the accuracy and durability to meet your requirements.
Key Features & Technical Specifications
Material Advantage: 40Cr steel provides high tensile strength and good toughness after quenching and tempering. It is widely used for gears that require both strength and wear resistance.
DIN 6 Accuracy: Manufactured to DIN 6 tolerance class, ensuring smooth and quiet operation within the gearbox. This precision reduces vibration, noise, and power loss.
Heat Treated: Carefully controlled heat treatment process delivers a surface hardness of 50–55 HRC (customizable), with a tough core to withstand impact loads.
1-Year Warranty: All our ring gears come with a 12-month warranty against manufacturing defects, giving you peace of mind.
Customizable Design: We can produce ring gears with module from 1 to 10, varying tooth counts, and specific internal diameters to fit your gearbox housing.
Applications: Ideal for industrial gearboxes, wind turbine drives, automotive transmissions, and heavy machinery.
Standard Parameter Table (Reference)
| Parameter | Value / Range |
|---|---|
| Material | 40Cr (AISI 5140 equivalent) |
| Accuracy Grade | DIN 6 |
| Hardness (Surface) | 50–55 HRC (adjustable) |
| Core Hardness | 28–35 HRC |
| Tooth Profile | Involute (standard, others available) |
| Module | 1–10 (custom) |
| Max Outer Diameter | Up to 1200 mm |
| Heat Treatment | Quenching + Tempering (optional carburizing) |
| Warranty | 1 Year |
Production & Quality Control
Every ring gear is machined from high-grade 40Cr billet using advanced CNC gear hobbing and shaping machines. Our in-house heat treatment workshop ensures consistent hardness and minimal distortion. After heat treatment, each gear undergoes final grinding and inspection on coordinate measuring machines (CMM) to verify tooth profile, pitch, and runout. We also perform 100% magnetic particle inspection to detect surface defects.
Customer Benefits
Reduced Downtime: Heat treated 40Cr ring gears resist wear and pitting, extending service life in heavy-duty gearboxes.
Energy Efficiency: DIN 6 accuracy minimizes friction losses, improving overall transmission efficiency by up to 2–3% compared to lower grades.
Noise Reduction: Precise tooth engagement lowers operating noise, which is critical for equipment used in noise-sensitive environments.
Easy Integration: Customizable dimensions allow direct replacement or new designs without major modifications to existing housings.
Trust & Support
Established in 2022, Henan San Kuang Machinery Technology Co., Ltd. has rapidly grown into a reliable partner for gear component solutions. With an annual export value of US$2.5–5 million and a factory spanning 10,000–30,000 m², we serve customers across North America, Europe, Southeast Asia, Africa, and more than 20 other regions. Our products are shipped from Shanghai, Lianyungang, Qingdao, and Tianjin ports with careful packaging to prevent damage. Beyond the 1-year warranty, we offer technical support and quick response to any inquiry. Choose our 40Cr Internal Ring Gear for a robust, long-lasting upgrade to your gearbox. Contact us today for a quote or sample testing!
Frequently Asked Questions
Q: What does DIN 6 accuracy mean for a ring gear?
A: DIN 6 is a high-precision standard for gear tolerances. It ensures consistent tooth spacing, profile, and runout, which results in smoother operation, lower noise, and better load distribution compared to lower grades like DIN 8 or 9.Q: Can you customize the internal diameter or tooth count?
A: Yes, we can customize the internal ring gear according to your gearbox design. Please provide your required module, number of teeth, inner diameter, and outer diameter.Q: What is the typical lead time for a custom order?
A: For standard sizes, lead time is 15–20 working days. Custom orders may take 25–35 working days depending on complexity and quantity. We prioritize urgent requests upon agreement.Q: How do you ensure the hardness is consistent across all teeth?
A: We use programmable furnace atmospheres and precise quenching parameters. After heat treatment, we conduct Rockwell hardness tests on multiple teeth and record the results for traceability.Q: Is the 1-year warranty applicable to all defects?
A: The warranty covers manufacturing defects such as material cracks, dimensional deviations beyond tolerance, and premature wear due to heat treatment issues. It does not cover damage from improper use or modification.Q: Do you provide samples before mass production?
A: Yes, we can supply a sample piece after evaluating your design. Sample cost is negotiable, and it will be deducted from the final order if you proceed with volume production.Q: What payment terms do you accept?
A: We commonly accept T/T, L/C, and Western Union. For new customers, a 30% deposit and 70% before shipment is typical. Long-term partners may enjoy flexible terms.Q: How is the ring gear packaged for export?
A: Each gear is individually wrapped with anti-rust paper and placed in a wooden crate with foam padding to prevent movement. We also provide moisture-proof and shock-proof packaging upon request.
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