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Help CenterBlack Oxide Coated Gear Ring, 40Cr Steel, Module 2.5, Precision Ground, Maximum Load 500Nm
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As a professional manufacturer based in Luoyang, Henan, China, Henan San Kuang Machinery Technology Co., Ltd. specializes in high-precision gear components for demanding industrial applications. Our Black Oxide Coated Gear Ring, crafted from premium 40Cr alloy steel with a module of 2.5, is precision ground to ensure exceptional wear resistance and dimensional stability under heavy loads. Designed for torque transmission up to 500 Nm, this gear ring offers a reliable solution for machinery requiring consistent performance and long service life.
Our manufacturing facility spans 10,000–30,000 square meters and is equipped with advanced CNC grinding and heat treatment lines. With an annual export value of US$2.5–5 million and a team of 51–100 skilled employees, we deliver gear components that meet international standards for rotary systems, reducers, and heavy equipment transmissions.
Product Highlights & Technical Specifications
- Material Strength: 40Cr alloy steel offers high hardenability and toughness after quenching and tempering.
- Surface Protection: Black oxide coating provides corrosion resistance and reduces friction during operation.
- Precision Ground: Ground tooth flanks ensure smooth meshing, low noise, and high efficiency.
- Load Capacity: Rated for 500 Nm continuous torque, making it suitable for medium-duty power transmission.
- Customizable Dimensions: Available in various inner/outer diameters and keyway configurations upon request.
- Consistent Quality: 100% dimensional inspection and hardness testing performed on every batch.
| Parameter | Value |
| Material | 40Cr Alloy Steel (equivalent to AISI 5140) |
| Module | 2.5 |
| Number of Teeth | Customizable (standard ranges available) |
| Surface Hardness | HRC 50–55 (after heat treatment) |
| Precision Grade | DIN 6–7 (ground finish) |
| Maximum Torque | 500 Nm |
| Surface Coating | Black Oxide (magnetite layer) |
| Application | Gearboxes, reducers, conveyors, agricultural machinery, industrial drives |
Key Advantages for Your Application
- Reduced maintenance frequency due to the black oxide layer’s anti-rust properties and low friction coefficient.
- Enhanced durability under cyclic loads – 40Cr steel’s fatigue resistance extends component life in demanding environments.
- Quiet operation: precision-ground teeth minimize vibration and noise levels compared to hobbed or milled gears.
- Easy integration: gear ring can be custom bored and keyed to fit your shafts, with pilot bore available for quick mounting.
- Cost-effective alternative to case-hardened gears while still providing adequate wear performance for many industrial tasks.
Our gear rings undergo strict quality control at every stage – from raw material analysis (chemical composition, cleanliness) to final dimensional verification using coordinate measuring machines (CMM). We maintain a robust supply chain and can accommodate both small prototype orders and large-volume production runs.
Trusted by Global Customers
Henan San Kuang Machinery Technology Co., Ltd. has established a solid reputation in North America, South America, Europe, Southeast Asia, Africa, and Oceania. With convenient shipping from Shanghai, Lianyungang, Qingdao, and Tianjin, we ensure timely delivery worldwide. Our annual export value of US$2.5–5 million reflects our commitment to satisfaction and quality.
We invite you to experience the performance and reliability of our Black Oxide Coated Gear Ring. Contact our sales team today for a quote, technical drawing, or sample testing. Let us support your machinery with precision gear solutions that deliver consistent results.
Frequently Asked Questions
- What is the difference between black oxide and other coatings? Black oxide is a conversion coating that provides mild corrosion resistance and reduces light reflection. It does not add significant thickness, so it maintains the gear’s dimensional precision.
- Can this gear ring be used in high-temperature environments? Black oxide typically withstands up to 300°F (150°C) continuously. For higher temperatures, please inquire about alternative finishes.
- Is the 40Cr material comparable to 4140 or 5140? Yes, 40Cr is equivalent to AISI 5140, offering similar hardenability and strength after heat treatment.
- What is the typical lead time for a custom gear ring? For standard sizes, it is 25–30 days. Custom dimensions may require 35–45 days depending on complexity and quantity.
- Do you provide heat treatment data? Yes, we can supply hardness test reports and microstructural analysis upon request.
- Can the gear ring be supplied without a black oxide coating? Absolutely, we can provide raw, phosphated, or nickel-plated surfaces as alternatives.
- How do I mount the gear ring to a shaft? We can machine keyways, set screws, or interference fits. Our standard version comes with a pilot bore for customer finishing.
- What is the minimum order quantity (MOQ)? We accept orders starting from 10 pieces for standard specifications. Custom orders have flexible MOQs based on material and tooling.
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