Jun 2025
High Tensile Bolts Specifications and Grades | Pankaj International
In the world of industrial fasteners, high tensile bolts are known for their strength, reliability, and durability. These bolts are used in demanding applications such as construction, automotive, railways, heavy engineering, and structural steel frameworks — where standard bolts simply won’t do.
At Pankaj International, based in Ludhiana (India), we specialize in manufacturing and exporting high-quality high tensile bolts and screws for a wide range of industries across the globe. Whether you need standard bolts or custom solutions, we’ve got you covered.
In this blog post, we’ll break down the specifications and grades of high tensile bolts in simple terms — helping you choose the right fastener for your needs.
What Are High Tensile Bolts?
High tensile bolts are stronger than regular bolts and made from carbon steel or alloy steel that’s heat-treated for higher strength. These bolts are built to withstand high stress and heavy loads without deforming or breaking.
The term “high tensile” refers to the tensile strength of the material — how much pulling force the bolt can handle before failing. These fasteners are ideal for critical joints in heavy-duty applications
High Tensile Bolt Specifications:
High tensile bolts follow international standards and specifications to ensure consistent quality and performance. Below are some of the commonly followed specifications:
Standards We Follow at Pankaj International:
ISO 898-1
DIN 931 / 933
ASTM A325 / A490
IS 1364 / IS 1367
BS 3692
EN 14399
Available Sizes:
Diameter: M6 to M64 (or as per requirement)
Length: 10mm to 500mm
Threads: Metric / UNC / UNF / BSW
Surface Coating Options:
Black Oxide
Zinc Plated (Blue / Yellow)
Hot-Dip Galvanized (HDG)
Dacromet / Geomet Coating
Phosphated
We also provide customized fasteners as per your drawings, specific neck profiles, or thread types.
High Tensile Bolt Grades
High tensile bolts are available in different grades depending on their tensile and yield strength. Choosing the right grade is crucial based on your load requirements.
Common High Tensile Bolt Grades We Manufacture:
| Grade |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Application |
| 8.8 |
800 |
640 |
General industrial use, machinery |
| 10.9 |
1040 |
940 |
Automotive, heavy engineering |
| 12.9 |
1220 |
1100 |
High-performance applications |
| ASTM A325 |
830 |
660 |
Structural steel, bridges |
Note: The higher the grade, the stronger the bolt. However, higher grades also mean reduced flexibility — so selection must be based on the application’s load and vibration behavior.
Applications of High Tensile Bolts :
At Pankaj International, our high tensile bolts are used in a wide range of industries including:
Construction (steel structures, bridges)
Automotive & Heavy Vehicles
Railway Tracks & Coaches
Industrial Machinery
Oil & Gas Pipelines
Wind Turbines & Power Plants
Each application demands high strength, corrosion resistance, and long-term performance — which is why we provide bolts that meet global standards.
Why Choose High Tensile Bolts from Pankaj International?
Pankaj International is a leading manufacturer and exporter of fasteners from Ludhiana, India. With over 25+ years of experience, our ISO 9001:2015 & BS EN 15048-1:2007 certified plant ensures world-class manufacturing and quality control.
Key Features:
In-house hot & cold forging
CNC machining & thread rolling
Advanced testing (tensile, hardness, MPI, spectrometry)
Custom designs as per customer drawings
Global export capabilities
Whether you need bulk orders for standard bolts or custom solutions for specific applications — we provide both at competitive prices with on-time delivery.
Packaging & Delivery:We offer customized packaging options like:
Wooden pallets
Corrugated boxes
Plastic drums or bags
Barcoded & labeled packaging as per client requirements
We ensure quick and safe delivery across India and international markets including the US, Europe, and the Middle East.
Final Words:
Choosing the right high tensile bolt grade and specification is essential for the safety and performance of your application. At Pankaj International, we not only offer the right fastener — we offer the right advice, support, and partnership.
If you’re looking for a reliable supplier of high tensile bolts, look no further.
Reach out to us today with your inquiry and drawings, and we’ll provide a fast and accurate quote tailored to your requirements.