What Are Threaded Hex Bolts? A Complete Guide for Industrial Use

In the world of industrial fasteners, threaded hex bolts stand out as one of the most essential and widely used components. Whether you're working in construction, heavy machinery, automotive, or infrastructure projects, hex bolts provide unmatched strength, reliability, and versatility.

What Are Threaded Hex Bolts?
Threaded hex bolts, also known as hex head bolts or hex cap screws, are mechanical fasteners characterized by:
A six-sided hexagonal head for wrench-tightening
A partially or fully threaded shank for secure fastening
High tensile strength and torque resistance
They are typically used in conjunction with nuts and washers to join two or more parts together, especially in high-stress industrial environments.

Why Choose Threaded Hex Bolts for Industrial Use?
Threaded hex bolts are ideal for industrial applications due to the following advantages:
Strong Grip & Load-Bearing Capacity
Perfect for heavy-duty assembly and structural integrity.
Ease of Installation
The hexagonal head allows multiple wrenching options.
Variety of Materials & Coatings
Available in stainless steel, carbon steel, alloy steel, and galvanized finishes for corrosion resistance.
Global Standard Compliance
Manufactured according to ISO, DIN, ASTM, and BS standards for international compatibility.
Common Applications in Industry
Threaded hex bolts are essential in a wide range of industries:
Industry    Application
Construction    Steel structures, bridges, tunnels
Automotive    Engine blocks, chassis, suspension systems
Machinery    Equipment assembly, motor housing, gear systems
Oil & Gas    Pipeline systems, drilling rigs
Shipbuilding    Hull assembly, marine engines (often using stainless steel)

Types of Threaded Hex Bolts
Understanding the different types helps you choose the most effective bolt for your needs:
Fully Threaded Hex Bolts
Entire shank is threaded – ideal for adjustable or clamping applications.
Partially Threaded Hex Bolts
Stronger in shear – preferred for heavy-load structural joints.
Hex Tap Bolts
Nearly full-length threads with tighter tolerances, often used in precision machinery.

Materials and Finishes
Material    Features    Use Case
Carbon Steel    High strength, economical    General purpose
Stainless Steel (304/316)    Corrosion-resistant    Marine, chemical industries
Alloy Steel    Extra hardness    High-temperature or stress areas
Galvanized / Zinc Plated    Rust-resistant coating    Outdoor or moist environments

How to Select the Right Threaded Hex Bolt
When sourcing or installing hex bolts, consider these critical factors:
Diameter & Length – Match to hole size and load-bearing requirements.
Thread Pitch & Type – Metric or imperial (UNC/UNF); ensure compatibility with nuts or tapped holes.
Bolt Grade – Indicates strength (e.g., Grade 5, 8, or ASTM A325).
Environmental Conditions – Use coated or stainless bolts in corrosive or high-moisture environments.
Torque Requirements – Proper installation torque is key to ensuring bolt performance and safety.

Standards and Grades Reference
Standard    Region    Common Grades
ASTM A307 / A325 / A490    USA    Grade 2, 5, 8
DIN 933 / DIN 931    Germany    Class 8.8, 10.9, 12.9
ISO 4014 / 4017    Global    M6–M30 sizes commonly used

Looking for a Reliable Hex Bolt Manufacturer?
When choosing a threaded hex bolt supplier, quality assurance, technical expertise, and global export experience are essential. At Yuyao Safe Pipe Industry Co., Ltd., we not only manufacture high-quality hex bolts, but also offer OEM/ODM support, custom specifications, and strict quality control for industrial-grade fasteners.

We supply to clients across Southeast Asia, Europe, the Middle East, Africa, and North America — ensuring timely delivery, competitive prices, and consistent performance.

Custom Threaded Hex Bolt Solutions Available
We support:
Custom sizes (M6–M30)
Custom thread types (UNC, UNF, metric)
Surface finishes: Zinc plating, black oxide, hot-dip galvanizing
Packaging: Bulk or branded packaging available
Free samples for bulk buyers