GB812 Carbon Steel Black Oxide Round Nut
GB812 carbon steel black oxide round nut is a precision locking and adjustment fastener designed for applications requiring secure positioning, anti-loosening performance, and compact structural design. The GB812 carbon steel black oxide round nut is widely used in machine tools, mechanical assemblies, transmission systems, and industrial equipment where space-saving fastening and reliable torque retention are required.
Manufactured from carbon steel with a black oxide finish, the GB812 carbon steel black oxide round nut provides improved surface hardness, basic corrosion resistance, and excellent compatibility with threaded shafts and locking systems. It is a commonly used component in adjustment mechanisms and mechanical locking structures.
Product Overview
The GB812 carbon steel black oxide round nut is designed with a circular body and locking notches, allowing installation and tightening using specialized tools such as hook spanners or pin wrenches. Its structure provides stable axial positioning and prevents loosening under vibration.
This GB812 carbon steel black oxide round nut is widely used in precision machinery, bearing assemblies, and mechanical adjustment systems where controlled tightening is required. The round shape allows compact installation in confined spaces.
As a reliable industrial fastener, it plays an important role in mechanical locking and positioning systems across multiple industries.
Product Specifications
| Item | Description |
|---|---|
| Standard | GB812 |
| Product Name | GB812 Carbon Steel Black Oxide Round Nut |
| Material | Carbon Steel |
| Surface Finish | Black Oxide |
| Nut Type | Round Lock Nut |
| Drive Type | Notch / Hook Spanner Compatible |
| Thread Type | Metric Internal Thread |
| Size Range | M10–M100 |
| Strength Grade | Standard / High Strength (custom) |
| Corrosion Resistance | Moderate (enhanced by oiling/black oxide) |
| Packaging | Carton / Industrial bag / OEM packaging |
| Customization | Size, thread, surface treatment available |
Technical Parameters
| Parameter | Value |
|---|---|
| Tensile Strength | ≥ 400–800 MPa (depending on grade) |
| Yield Strength | Varies by carbon steel grade |
| Hardness | HV 180–280 |
| Density | 7.85 g/cm³ |
| Corrosion Resistance | Moderate (black oxide + oil film) |
| Operating Temperature | -40°C to 300°C |
| Thread Tolerance | 6H Standard |
| Manufacturing Standard | GB812 / Industrial equivalent |
Materials and Manufacturing Process
The GB812 carbon steel black oxide round nut is manufactured through precision machining and controlled finishing processes to ensure dimensional accuracy and stable performance.
- Raw material selection: High-quality carbon steel forging blanks
- Forging or turning: Formation of round nut body
- CNC machining: Precision shaping of notches and threads
- Thread tapping: Internal thread processing
- Heat treatment (optional): Improves mechanical strength
- Black oxide treatment: Surface oxidation for protection
- Anti-rust oil coating: Enhances corrosion resistance
- Inspection: Dimensional and functional testing
- Packaging: Industrial-grade export packaging
Each GB812 carbon steel black oxide round nut is designed for stable mechanical locking and long service life in industrial environments.
Applications of the Product
GB812 carbon steel black oxide round nuts are widely used in:
- Machine tools: Spindle and shaft locking systems
- Mechanical engineering: Adjustment and positioning systems
- Bearings: Preload and locking assemblies
- Automotive: Transmission and mechanical joints
- Industrial equipment: Precision adjustment mechanisms
- Hydraulic systems: Control and locking components
- Heavy machinery: Shaft and rotating system fixation
- Manufacturing systems: Equipment calibration and fastening
Their round structure makes them ideal for precise mechanical adjustment applications.
Why Choose This Product
- Compact round structure for tight installation spaces
- Stable locking performance under vibration
- Compatible with precision adjustment tools
- Cost-effective carbon steel construction
- Black oxide finish improves surface protection
- Suitable for mechanical positioning systems
- Available in multiple sizes and custom options
- Reliable performance in industrial environments
- Widely used standardized design (GB812)
The GB812 carbon steel black oxide round nut ensures stable and precise mechanical fastening performance.
Why Choose Flybear
Flybear is a professional manufacturer specializing in industrial fastening systems and precision mechanical components.
- Advanced CNC machining and forging capabilities
- Stable mass production for industrial supply chains
- Custom engineering support based on drawings
- Strict quality inspection and control systems
- Global export experience in fastener manufacturing
- Technical consultation for mechanical applications
Flybear provides reliable fastening solutions for OEM manufacturers, distributors, and industrial engineering projects.
Quality Inspection and Control
Strict quality control ensures precision and reliability:
- Raw material chemical analysis
- Dimensional accuracy inspection
- Thread gauge testing
- Hardness testing after heat treatment
- Surface finish and black oxide inspection
- Functional fit testing
- Packaging quality verification
All processes comply with ISO quality management standards.
Selection Guide
When selecting GB812 carbon steel black oxide round nuts, consider:
- Thread size and pitch compatibility
- Load and torque requirements
- Installation tool compatibility
- Space constraints in assembly
- Corrosion environment conditions
- Required mechanical precision level
Proper selection ensures safe and stable operation in mechanical systems.
FAQ
1. What is a GB812 round nut used for?
It is used for mechanical locking and adjustment in machinery and equipment.
2. What tool is used to install it?
Hook spanners or pin-type wrenches are typically used.
3. Is black oxide corrosion resistant?
It provides basic protection and is often enhanced with anti-rust oil.
4. Can it be reused?
Yes, if threads and notches are not damaged.
5. Can custom sizes be made?
Yes, Flybear supports customized specifications and machining.
We always adhere to the philosophy of quality first and customer first, providing customers with high-quality fastener products and one-stop fastener solutions.
Contact us for quotation, customization, and technical support via Contact Us.
