Hex bolts are widely used across various industries due to their simple design, high strength, and ease of installation. Below are key applications and advantages:

The markings on bolt heads are not decorative, but serve to identify certain properties of the bolt.
For example:
Strength grade
The most common are numerical designations, such as 8.8, 10.9, 12.9.
The first number ×100 = minimum tensile strength (MPa).
The second number ÷10 = yield ratio.
For example, ‘12.9’ denotes a tensile strength ≥1200 MPa and a yield strength ≥1080 MPa.

• Construction Industry: Used in structural steel connections for bridges, building frameworks, and scaffolding.
• Machinery Manufacturing: Essential for fastening mechanical parts in lathes, heavy-duty equipment, and assembly lines.
• Automotive and Transportation: Secures critical parts like chassis, engines, and transmission systems.
• Home Appliances and Electronics: Provides reliable connections for air conditioners, washing machines, and televisions.
• Energy and Petrochemical Industry: Crucial for wind turbines, nuclear power plants, and petrochemical plants.
• Marine and Offshore Engineering: Used in shipbuilding and offshore platforms with corrosion-resistant stainless steel variants.
• Furniture Manufacturing: Provides stability and durability for beds, tables, chairs, and cabinets.

Carbon steel is an iron-carbon alloy with carbon content ranging from 0.0218% to 2.11%. It generally contains small amounts of silicon, manganese, sulfur, and phosphorus.

Classification:

• By Use: Carbon structural steel, carbon tool steel, and free-cutting structural steel
• By Smelting Method: Flat furnace steel, converter steel
• By Deoxidation Method: Boiling steel (F), sedentary steel (Z), semi-sedentary steel (b), special sedentary steel (TZ)
• By Carbon Content: Low carbon steel (≤0.25%), medium carbon steel (0.25%-0.6%), high carbon steel (≥0.6%)
• By Quality: Ordinary carbon steel, high-quality carbon steel, premium steel