Rajal Industries

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 TypeDescriptionApplication
Coarse Thread
(UNC/ISO Metric)
General-purpose, high durabilityHeavy machinery, automotive, construction
Fine Thread
(UNF/Metric Fine)
Increased tensile strength, more thread engagementAerospace, high-precision assembly
Partially Threaded
Bolts
Higher shear strength, better clampingStructural fastening, automotive
Fully Threaded BoltsAllows maximum adjustability and load distributionGeneral fastening, repairs, and assemblies

Thread Fitment & Compliance

Corrosion Resistance & Environmental Suitability

High-tensile hex bolts are often exposed to moisture, chemicals, and extreme weather conditions, requiring protective coatings for longevity.

Coating TypeCorrosion Protection

Level
Ideal Applications
Plain Steel (No Coating)LowIndoor 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 CoatingMedium corrosion resistance with a sleek appearanceAutomotive, machinery, industrial tools
Geomet/PTFE CoatingsExtreme (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 RangeStandards
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: VariableISO 4162 – Metric flange bolts for high-strength applications
DIN 6921 – German standard for hex flange bolts

Material & Strength Grades

Material TypeAvailable Strength

Grades
Industry Standards
Mild Steel & Carbon Steel4.6, 5.6, 8.8ISO 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 SteelClass 8.8, 10.9ISO 898-1, ASME B18.5, DIN 603
Alloy Steel (Heat Treated)Class 10.9ISO 898-1, ASTM A325

Common Applications of High-Tensile Hex Bolts

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