Quality Assurance
Every Fastener Checked for
Maximum Accuracy and Performance
Explore CNXD’s Proven Quality in
Automotive & Industrial Fasteners
As a subsidiary of CNRL, CNXD manufactures and supplies bolts, nuts, washers, circlips, CNC machined parts, keys, and aftermarket fasteners—including wheel nuts, lug bolts, eccentric camber bolts, and truck bolts—carrying forward over 30 years of quality and trust.
Certified to IATF 16949 and equipped with advanced CNC machining and 50+ high-precision inspection devices, we provide reliable fastening solutions for automotive, energy, and heavy machinery industries.
Inspection Process Flow
How We Ensure Fastener Quality
Whether for precision automotive projects or large-scale infrastructure, CNXD delivers bolts, nuts, washers, circlips, and CNC parts with rigorous quality control.
01
Incoming Material
Inspection
Each batch undergoes strict testing with advanced spectrometers, ensuring raw materials meet GB, DIN, and JIS standards for high-performance fasteners.
02
In-Process Inspection
Real-time monitoring during CNC machining, cold heading, and thread rolling ensures precise tolerances, reducing defects and improving production efficiency.
03
Final Product Inspection
100% inspection or statistical sampling with 50+ advanced devices guarantees defect-free delivery and consistent compliance with customer specifications.
04
Documentation & Traceability
Complete PPAP III, FMEA, and inspection reports ensure full process traceability and compliance for every fastener shipped.
Comprehensive Quality Checks
Precision Testing That
Guarantees Reliable Fasteners
When you source bolts, nuts, or CNC parts from CNXD, every piece is verified through world-class testing and certified to ISO, DIN, JIS, ANSI, BS, GB, and QB standards—ensuring precision fit, dependable strength, and lasting performance in your projects.
CMM Inspection
CMM machines provide high-precision geometric verification to ensure perfect component alignment and reliable assembly performance across all production batches.
- ±0.005 mm Accuracy
- 3D Dimensional Mapping
- Zero Rework Guarantee
Hardness Verification
To ensure lasting strength, each fastener undergoes Rockwell and Vickers testing to confirm hardness consistency across production batches.
- 20–60 HRC Range
- Dual Test Methods
- Batch Consistency Check
Torque Performance
We validate torque up to industrial-grade limits to guarantee stable clamping force and long-term joint reliability under vibration and load.
- 2000 Nm Validation
- Anti-Loosening Control
- Vibration Resistance
Tensile Strength
Every fastener is tested for high tensile endurance, ensuring dependable load-bearing capacity for demanding mechanical and structural applications.
- 800+ MPa Strength
- Load Simulation Test
- Structural Reliability
Metallographic Analysis
Inside each component lies precision. We analyze grain structure and surface layers to detect decarburization or defects before mass production.
- Grain Structure Check
- Decarburization Detection
- Material Integrity Proof
Salt Spray Test
Corrosion resistance is verified through long-hour salt spray exposure, ensuring coating durability even in harsh or coastal environments.
- 500+ Hours Resistance
- Corrosion Simulation
- Coating Durability Test
