• tan@nbzyl.com
Our company has over twenty years of experience in production and sales, with strict control over product quality, and all products have undergone international quality testing

Our factory’s main product is high strength hex bolts, which are widely used in various industries and applications where strong and reliable connections are required. The quality requirements for high strength hex bolts are crucial to ensure their performance and safety.

1. Material: High strength hex bolts are typically made from alloy steel, such as grade 8.8 or 10.9 bolt. The material must meet the required tensile, yield, and hardness specifications.
2. Manufacturing process: The manufacturing process should involve precision machining and heat treatment to achieve the desired mechanical properties. This includes proper forging, threading, and tempering processes.
3. Dimensional accuracy: High precision is crucial for hex bolts. The dimensions, including thread pitch, diameter, and length, should comply with international standards, such as ISO, DIN, or ASTM.
4. Thread quality: The threading on high strength hex bolts must be accurate and smooth to ensure proper engagement with mating parts. The thread profile, pitch, and depth should meet the required standards to prevent thread stripping or galling.
5. Surface finish: The hex bolts should have a smooth and clean surface finish to prevent corrosion and ensure ease of installation. Common surface treatments include zinc plating, black oxide, or galvanizing.
6. Mechanical properties: High strength hex bolts require specific mechanical properties, such as high tensile and shear strength. The bolts should undergo rigorous testing to ensure they meet the required strength and hardness specifications.
7. Quality control and certification: The production of high strength hex bolts should be subject to strict quality control procedures, including inspection at various stages of manufacturing. The bolts should be accompanied by relevant certifications, such as material certificates and test reports.

By adhering to these quality requirements, high strength hex bolts can provide strong and reliable connections in various applications, ensuring the safety and performance of the connected structures or equipment.

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