Custom CNC Machined 40CrNiMo Alloy Steel Hub
Custom CNC Machined 40CrNiMo Alloy Steel Hub
Product Overview
This custom CNC machined hub is manufactured from 40CrNiMo high-strength alloy steel, combining precision CNC turning, multi-axis milling, drilling, tapping, and controlled heat treatment to achieve excellent mechanical performance.
The component integrates multiple precision features—including a central bore, threaded mounting holes, locating holes, and internal reinforcement ribs—into a single machined part. It is designed for demanding industrial applications requiring high strength, dimensional stability, fatigue resistance, and reliable long-term service.
Why Choose 40CrNiMo Alloy Steel?
40CrNiMo is a chromium–nickel–molybdenum alloy steel widely used for highly loaded mechanical parts because it can achieve an excellent balance of:
- High tensile strength
- Good toughness
- High fatigue resistance
- Excellent hardenability
- Wear resistance after heat treatment
- Stable performance under heavy cyclic loading
Its properties depend heavily on the selected quenching and tempering process, making heat treatment a critical part of manufacturing.
Key Product Features
- CNC turned outer cylindrical surface
- Precision center bore
- Four threaded mounting holes
- Two locating holes
- Internal reinforcement ribs
- Large precision-machined cavity
- Heat-treated alloy steel
- Excellent concentricity
- High structural rigidity
- Custom geometry according to customer drawings
Manufacturing Process
40CrNiMo Forged Round Bar
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Material Certification
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Rough CNC Turning
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Stress Relief (If Required)
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Semi-Finish Turning
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CNC Milling
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Drilling
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Thread Tapping
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Heat Treatment (Quenching & Tempering)
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Finish Machining
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Deburring
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100% Dimensional Inspection
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PackagingHeat Treatment Advantages
For 40CrNiMo, quenching and tempering are commonly used to develop a combination of high strength and good toughness. The exact temperatures and holding times depend on the required mechanical properties and component size. Proper heat treatment also improves fatigue performance and service life in heavily loaded applications.
Typical benefits include:
- Increased core strength
- Improved toughness
- Better wear resistance
- Enhanced fatigue life
- Improved dimensional stability after finish machining
Engineering Design Features
Precision Center Bore
The accurately machined bore provides reliable shaft alignment and concentric assembly.
Threaded Mounting Holes
The four threaded holes allow secure fastening while maintaining uniform load distribution.
Internal Reinforcing Ribs
The rib structure increases stiffness without requiring a completely solid design, helping optimize strength-to-weight characteristics.
Locating Holes
Precision locating holes support repeatable assembly and accurate positioning during installation.
Technical Specifications
| Property | Description |
|---|---|
| Material | 40CrNiMo Alloy Steel |
| Manufacturing Process | CNC Turning + CNC Milling |
| Heat Treatment | Quenched & Tempered (Custom Specification) |
| Surface Finish | Precision Machined |
| Mounting Holes | Threaded |
| Locating Features | Precision Bores |
| OEM / ODM | Supported |
| Prototype | Available |
| Drawing Formats | STEP / STP / IGS / X_T / DWG / PDF |
Why Heat Treatment Matters
Unlike aluminum components, high-strength alloy steels such as 40CrNiMo rely on heat treatment to achieve their final mechanical properties. Inadequate quenching or tempering can reduce strength or toughness, while excessive temperatures may coarsen the grain structure and degrade performance. Process parameters should therefore be selected according to the part geometry and required service conditions.
Typical Applications
Components with this geometry are commonly found in:
- Industrial Automation Equipment
- Heavy Machinery
- Servo Drive Systems
- Gearbox Assemblies
- Mining Equipment
- Construction Machinery
- Motion Control Systems
- Machine Tools
- Precision Fixtures
- Custom OEM Mechanical Equipment
The final application depends on the customer’s engineering design.
Quality Inspection
Every production batch may include:
- Coordinate Measuring Machine (CMM)
- Bore Gauge Inspection
- Thread Plug Gauge Inspection
- Runout Measurement
- Concentricity Inspection
- Hardness Testing (after heat treatment)
- Visual Cosmetic Inspection
- Material Traceability
OEM Customization
We support customization of:
- Overall dimensions
- Bore diameter
- Thread specification
- Hole pattern
- Heat treatment requirements
- Hardness targets
- Surface roughness
- Surface coatings (if required)
- Laser marking
- Packaging
Frequently Asked Questions
Why is 40CrNiMo selected instead of carbon steel?
40CrNiMo offers higher hardenability, strength, toughness, and fatigue resistance after proper heat treatment, making it suitable for demanding mechanical components.
Is finish machining performed before or after heat treatment?
Many precision components are rough-machined first, heat treated to achieve the required properties, and then finish-machined to meet final dimensional tolerances. The exact sequence depends on the design and tolerance requirements.
Can hardness requirements be customized?
Yes. Required hardness and heat-treatment specifications can be defined according to customer drawings or engineering standards.
Which CAD formats are supported?
STEP, STP, IGS, Parasolid (X_T), DWG, DXF, and PDF are commonly accepted.
Related Products
- CNC Machined Alloy Steel Flanges
- Precision Heat-Treated Steel Bushings
- CNC Machined Drive Hubs
- Heavy-Duty Bearing Housings
- Custom Transmission Components
Request a Quote
Upload your engineering drawing or 3D model to receive:
- Free DFM (Design for Manufacturability) Review
- Material Selection Recommendations
- Heat Treatment Process Suggestions
- Competitive CNC Machining Quotation
- Prototype & Mass Production Support
