Hex Bolts
What are Hex Bolts?
Hex bolts are six-sided, externally threaded fasteners designed for assembly with a nut or tapped hole. Known for their superior clamping strength and versatility, hex bolts are widely used in structural assemblies, machinery, automotive applications, and heavy equipment.
Asiad Steel Industries is a trusted manufacturer, supplier, and exporter of premium Hex Bolts available in various types, sizes, grades, and finishes, providing strong, durable, and reliable fastening solutions for a wide range of industrial and construction applications worldwide.
Key Features
Leak-Proof
Jointing
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Size | M3 to M100 (custom sizes available) |
| Pressure Ratings | ANSI / ASME Class | Class 150, 300, 600, 900, 1500, 2500 |
| PN Ratings | PN6, PN10, PN16, PN25, PN40, PN64 | – |
| Product Types | Hex Bolts | Full Thread, Partial Thread, Standard Length, Custom Length |
| Hex Bolt Material | Carbon Steel | Grades 4.6, 8.8, 10.9, 12.9 |
| Stainless Steel | SS304, SS316, SS316L | |
| Alloy Steel | Custom alloy options | |
| Standards & Certifications | ASTM | ASTM A325, ASTM A490, ASTM F568M, ASTM F593 |
| ASME / ANSI | ASME B18.2.1, ASME B18.2.2 | |
| ISO / DIN | ISO 4014, ISO 4017, DIN 931, DIN 933 | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175, RoHS | |
| Design Features | Head Type | Hex Head, Heavy Hex, Flange Hex |
| Thread Type | Coarse, Fine, Metric, UNC, UNF | |
| Surface Treatment | Zinc Plated, Hot Dip Galvanized, Black Oxide, Passivated | |
| Tolerance | As per ASTM / ASME / ISO standards | |
| Coating & Surface Finish | Anti-Corrosion Coating | Zinc, Nickel, Phosphate, Passivation |
| Optional Coatings | PTFE, PVD, Anodizing | |
| Surface Finish | Mill Finish, Polished, Bead Blasted | |
| Mechanical Properties | Tensile Strength | 400 – 1200 MPa (grade dependent) |
| Yield Strength | 200 – 1000 MPa | |
| Hardness | 120 – 350 HB | |
| Elongation | ≥ 10 – 25 % | |
| Modulus of Elasticity | ~200 GPa | |
| Fatigue Strength | 250 – 450 MPa | |
| Corrosion Resistance | Good to Excellent (SS > CS > Alloy Steel) | |
| Operating Temperature Range | -40 to 600 °C (material-dependent) | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic (where applicable) |
| Non-Destructive Testing | Magnetic Particle, Ultrasonic, Dye Penetrant | |
| Destructive Testing | Tensile, Hardness, Impact |
Dimensions (Hex Bolt – ISO Metric)
| Nominal Size (M) | Thread Pitch (mm) | Bolt Length (mm) | Head Width Across Flats (mm) | Head Height (mm) | Shank Diameter (mm) | Approx. Weight (kg) |
|---|---|---|---|---|---|---|
| M3 | 0.5 | 6 – 50 | 5.5 | 2 | 3 | 0.002 – 0.01 |
| M4 | 0.7 | 8 – 60 | 7 | 3 | 4 | 0.004 – 0.02 |
| M5 | 0.8 | 10 – 80 | 8 | 4 | 5 | 0.01 – 0.04 |
| M6 | 1.0 | 12 – 100 | 10 | 4 | 6 | 0.02 – 0.08 |
| M8 | 1.25 | 16 – 120 | 13 | 5 | 8 | 0.05 – 0.15 |
| M10 | 1.5 | 20 – 150 | 17 | 6 | 10 | 0.1 – 0.3 |
| M12 | 1.75 | 25 – 200 | 19 | 8 | 12 | 0.2 – 0.6 |
| M16 | 2.0 | 30 – 250 | 24 | 10 | 16 | 0.5 – 1.5 |
| M20 | 2.5 | 40 – 300 | 30 | 13 | 20 | 1 – 3 |
| M24 | 3.0 | 50 – 350 | 36 | 16 | 24 | 2 – 5 |
| M30 | 3.5 | 60 – 400 | 46 | 20 | 30 | 4 – 8 |
| M36 | 4.0 | 80 – 450 | 55 | 24 | 36 | 7 – 12 |
| M42 | 4.5 | 100 – 500 | 65 | 28 | 42 | 12 – 20 |
| M48 | 5.0 | 120 – 600 | 75 | 32 | 48 | 18 – 30 |
| M56 | 5.5 | 150 – 700 | 85 | 36 | 56 | 25 – 40 |
| M64 | 6.0 | 180 – 800 | 95 | 40 | 64 | 35 – 60 |
| M72 | 6.0 | 200 – 900 | 105 | 45 | 72 | 50 – 80 |
| M80 | 6.0 | 220 – 1000 | 120 | 50 | 80 | 70 – 100 |
| M100 | 8.0 | 250 – 1200 | 150 | 60 | 100 | 120 – 200 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 400 – 1200 | MPa (grade-dependent: 4.6, 8.8, 10.9, 12.9) |
| Yield Strength | 240 – 1000 | MPa |
| Hardness | 120 – 360 | HB (Brinell) |
| Elongation | ≥ 10 – 25 | % |
| Density | 7.8 | g/cm³ |
| Impact Toughness | ≥ 20 – 60 | J (Charpy) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 200 – 500 | MPa |
| Corrosion Resistance | Good to Excellent (SS > CS > Alloy Steel) | – |
| Thermal Conductivity | 15 – 50 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.40 – 0.85 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Surface Finish | Plain, Zinc Plated, Galvanized, Black Oxide | – |
| Thread Type | Metric, UNC, UNF | – |
| Operating Temperature Range | -40 to 400 | °C (material-dependent) |
| Torque Values | See standard charts per grade & diameter | N·m |
| Pressure Rating | Applicable to bolted joints | ASME / ISO Standards |
Chemical Composition
| Element | SS 304 (%) | SS 304L (%) | SS 316 (%) | SS 316L (%) |
|---|---|---|---|---|
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 | 10.0 – 14.0 | 10.0 – 14.0 |
| Carbon (C) | ≤ 0.08 | ≤ 0.03 | ≤ 0.08 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
Applications of Hex Bolts
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
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Why are hex bolts commonly used in industrial setups?
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