High-Tensile Hex Bolts
High-Tensile Hex Bolts are heavy-duty fasteners designed for high-load, high-stress, and critical structural applications. These bolts are manufactured from hardened alloy or carbon steel, offering exceptional tensile strength, shear resistance, and durability.
Used in construction, heavy machinery, infrastructure, and automotive industries, our high-tensile hex bolts conform to ISO, ASME, SAE, DIN, ASTM, and IS standards, ensuring they meet global engineering and safety requirements.
Head & Hex Design Specifications
Hexagonal Head Design
Provides superior torque application and prevents slipping during tightening.
Compatible with standard and impact wrenches, making it ideal for heavy-duty applications.
High-Precision Machined Head
Ensures consistent bearing surface, reducing stress concentration and increasing durability.
Available in full thread and partial thread configurations for flexibility in applications.
Chamfered or Radiused Edges
Improves bolt seating and load distribution for vibration resistance.
Meets the tolerance and precision standards of ISO, ASME, and DIN specifications.
Thread Specifications & Precision Engineering
| Thread Type | Description | Application |
|---|---|---|
| Coarse Thread (UNC/ISO Metric) | General-purpose, high durability | Heavy machinery, automotive, construction |
| Fine Thread (UNF/Metric Fine) | Increased tensile strength, more thread engagement | Aerospace, high-precision assembly |
| Partially Threaded Bolts | Higher shear strength, better clamping | Structural fastening, automotive |
| Fully Threaded Bolts | Allows maximum adjustability and load distribution | General fastening, repairs, and assemblies |
Thread Fitment & Compliance
- Metric threads conform to ISO 6g tolerances, ensuring accurate engagement with nuts and mating components.
- Imperial hex bolts adhere to ASTM A325, ASME B1.1, and SAE J429 standards.
Corrosion Resistance & Environmental Suitability
High-tensile hex bolts are often exposed to moisture, chemicals, and extreme weather conditions, requiring protective coatings for longevity.
| Coating Type | Corrosion Protection Level | Ideal Applications |
|---|---|---|
| Plain Steel (No Coating) | Low | Indoor use only |
| Zinc Plated (Yellow/Blue/White/Black) | Moderate (48-96 hours SST) | General industrial applications |
| Hot-Dip Galvanized (HDG) | High (600+ hours SST) | Outdoor, marine, bridges, heavy structures |
| Black Oxide Coating | Medium corrosion resistance with a sleek appearance | Automotive, machinery, industrial tools |
| Geomet/PTFE Coatings | Extreme (1000+ hours SST) | Aerospace, chemical, high-performance environments |
Salt Spray Testing (SST) per ASTM B117 & ISO 9227 ensures long-term rust prevention and durability.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Diameters: M6 to M36 (Metric) | ISO 7091 – International standard for flange bolts |
| Diameters: 1/4" to 1-1/2" (Imperial) | ASME B18.2.2 – American standard for hex flange bolts |
| Lengths: Variable | ISO 4162 – Metric flange bolts for high-strength applications |
| DIN 6921 – German standard for hex flange bolts |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Mild Steel & Carbon Steel | 4.6, 5.6, 8.8 | ISO 898-1, DIN 603, ASME B18.5 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506, DIN 603, ISO 8677 |
| High-Tensile Steel | Class 8.8, 10.9 | ISO 898-1, ASME B18.5, DIN 603 |
| Alloy Steel (Heat Treated) | Class 10.9 | ISO 898-1, ASTM A325 |
Common Applications of High-Tensile Hex Bolts
- Structural Engineering & Bridges – Used in steel-to-steel connections, frameworks, and high-load joints.
- Heavy Machinery & Industrial Equipment – Essential for gear assemblies, compressors, mining equipment, and turbines.
- Automotive & Aerospace – Provides secure fastening in engines, suspensions, and aircraft components.
- Railway & Metro Projects – Used in rail track fastening, metro rail, and locomotive assemblies.
- Power Plants & Renewable Energy – Fastens wind turbines, transmission towers, and heavy infrastructure
Why Choose Rajal Industries for High-Tensile Hex Bolts?
Manufactured to International Standards
Ensuring dimensional accuracy, strength, and durability.
High-Performance Materials
Hardened and heat-treated for superior tensile & shear strength.
High-Quality Material Selection
Ensuring long-lasting durability and reliability
Stringent Quality Control
Each bolt undergoes tensile testing, hardness testing, and thread fitment checks
Competitive Pricing & Timely Delivery
Efficient production and supply chain management
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Our Offices
C-204, Vaibhav Platina, Nr. Kaveri Trishra, S P Ring road, Shilaj, Ahmedabad, Gujarat-380054
Call us
+91-846 036 2030
Email Us
rajalfast@gmail.com sales@rajalindustries.com