The Grade 10 blackened fine thread hex nut is a high-strength fastener with unique structural characteristics and excellent mechanical properties.
- "Grade 10" indicates its strength classification, belonging to the high-strength nut category.
- "Blackened" refers to the surface treatment, forming a black oxide layer that enhances aesthetics and provides basic rust resistance.
- "Fine thread" means the thread pitch is finer than standard, offering better anti-loosening performance and higher connection precision.
Key Specifications & Parameters
Thread Sizes: Common fine-thread series include M4, M5, M6, M8, M10
Strength Grade:10 (Tensile strength ≥1000 MPa)
Material: Typically 35CrMo, 45# steel, or other alloy steels
Surface Treatment: Black oxide coating (blackening)
Width Across Flats: Complies with GB/T6175 standard
Thickness: Slightly thicker than standard nuts for enhanced strength
Performance Characteristics
High Strength – Withstands heavy loads and vibrations
Superior Anti-Loosening – Fine threads increase contact area for better grip
Moderate Corrosion Resistance – Blackening provides basic rust protection
Precision Fit – Fine threads allow for tighter tolerances
Aesthetic Appeal – Black finish suits various industrial applications
Application Scenarios
Machinery & Equipment
Precision Machine Tools
Used in high-accuracy applications:
Spindle housing fixation
Guide rail installation
Transmission system connections
Protective cover fastening
Construction Machinery (Excavators, Loaders, etc.)
Ideal for harsh working conditions:
Hydraulic system pipe connections
Structural component fastening
Undercarriage & critical load-bearing parts
Cab assembly
Automotive Manufacturing & Repair
Engine & transmission mounting
Suspension & braking systems
High-performance aftermarket modifications
Electronics & Electrical Equipment
Server racks & data center assemblies
Precision instrument mounting
Power distribution systems
Rail & Transportation
Bogies & chassis connections
Interior panel fastening
Electrical equipment installation
Aerospace (Non-Critical Applications)
Avionics & equipment bay mounting
Ground support tooling
Proper Installation & Usage
Pre-Installation Checks
✔ Verify thread compatibility with bolts
✔ Inspect for thread damage or coating defects
✔ Clean threads to remove debris
Recommended Tools
Torque wrenches (for precise tightening)
Fine-thread alignment guides
Anti-seize lubricant (for high-torque applications)
Common Issues & Solutions