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Henan San Kuang Machinery Technology Co., Ltd. is proud to offer custom machined components precision-engineered from 4140 alloy steel with a durable black oxide finish and a hardness of 45-50 HRC. As a manufacturer with over a decade of experience since 2014, we specialize in delivering high-strength, wear-resistant parts tailored to your exact specifications. Our components are ideal for demanding applications where reliability and longevity are critical.
Our 4140 alloy steel components are heat-treated to achieve a hardness of 45-50 HRC, providing an excellent balance of toughness and wear resistance. The black oxide finish not only enhances corrosion resistance but also reduces light reflection, making these parts suitable for visible assemblies. Each piece is machined using advanced CNC equipment, ensuring tight tolerances and consistent quality across every batch.
Key Features & Technical Specifications
- Material: 4140 alloy steel (chromium-molybdenum) – excellent strength-to-weight ratio and fatigue resistance.
- Hardness: 45-50 HRC (Rockwell C scale) – optimized for wear resistance without brittleness.
- Surface Finish: Black oxide (magnetite layer) – improves corrosion resistance and provides a matte appearance.
- Machining Capabilities: CNC turning, milling, drilling, threading, and grinding – complex geometries supported.
- Precision: Tolerances as tight as ±0.01 mm (achievable) – verified with CMM inspection.
- Customization: Dimensions, threads, keyways, holes, and surface treatments fully customizable.
- Applications: Gears, shafts, bushings, hydraulic components, automotive parts, oilfield equipment, and more.
- Quality Control: 100% inspection for critical dimensions and hardness testing per order.
| Parameter | Value |
| Material Grade | AISI 4140 (1.7225) |
| Hardness Range | 45-50 HRC |
| Surface Coating | Black Oxide (MIL-DTL-13924 compliant) |
| Max Diameter | Up to 500 mm (customizable) |
| Max Length | Up to 2000 mm (customizable) |
| Surface Roughness | Ra 0.8 μm (typical) |
| Inspection Equipment | CMM, Hardness Tester, Micrometer, Optical Comparator |
The combination of 4140 alloy steel and black oxide finish yields components that withstand high stress, cyclic loads, and moderate corrosion. For example, in hydraulic systems, these parts maintain dimensional stability under pressure; in gearboxes, they resist surface pitting. The 45-50 HRC hardness level provides a sweet spot – hard enough to resist abrasive wear, yet tough enough to avoid cracking under impact.
Benefits to customers: Reduced downtime due to longer part life, consistent performance in harsh environments, and cost savings from minimized replacements. Our custom approach means you get exactly the geometry you need, eliminating secondary operations.
Trust & Reliability
Backed by a 10,000-30,000 m² factory and a team of 51-100 skilled employees, Henan San Kuang Machinery Technology Co., Ltd. has been delivering precision components since 2014. Our annual export value of US$2.5–5 million reflects the trust placed in us by clients across North America, South America, Europe, Southeast Asia, Africa, and the Middle East. We hold multiple certifications including ISO9001, ISO14000, OHSAS18001, SA8000, and others, ensuring that our processes meet international quality, environmental, and social responsibility standards.
We ship from major ports: Shanghai, Lianyungang, Qingdao, and Tianjin, offering flexible logistics worldwide. Our commitment to quality is demonstrated by rigorous incoming material inspection, in-process checks, and final dimensional and hardness verification. Every order is backed by our responsive after-sales support.
Choose our custom machined 4140 alloy steel components with black oxide finish for your next project. Whether you need a prototype or high-volume production, we are ready to meet your requirements with competitive pricing and timely delivery. Contact us today to discuss your specifications and receive a customized quotation.
Frequently Asked Questions
- What is 4140 alloy steel and why is it used for these components? 4140 is a chromium-molybdenum steel known for its high strength, toughness, and fatigue resistance. It is commonly used in industrial machinery, automotive, and oilfield applications where parts must withstand heavy loads and wear.
- What does the black oxide finish do? Black oxide provides a thin, corrosion-resistant layer that also reduces light reflection and improves lubricant retention. It does not significantly change dimensions, making it ideal for precision parts.
- What does 45-50 HRC hardness mean in practice? This hardness range offers a balance of wear resistance and toughness. Parts are hard enough to resist abrasion but not brittle, suitable for gears, shafts, and bushings under moderate impact.
- Can you achieve tight tolerances like ±0.01 mm? Yes, we can hold tolerances as tight as ±0.01 mm depending on feature geometry and size. Our CNC machines and CMM inspection ensure consistency.
- What is the minimum order quantity (MOQ)? MOQ is negotiable based on complexity. We accept both small prototype runs and large production volumes. Contact us for a tailored quote.
- How long does delivery take? Typical lead time is 15–30 days from order confirmation, depending on quantity and complexity. Rush orders may be accommodated upon request.
- Do you provide certifications for material and heat treatment? Yes, we can provide material certificates (mill test reports) and hardness test reports. Our processes are certified under ISO9001, and we follow strict traceability procedures.
- How do you ensure the black oxide finish is consistent? We follow controlled immersion and oxidation processes, with regular bath testing and visual inspection. The finish meets MIL-DTL-13924 standards for thickness and uniformity.
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