Hex Nut
What are Hex Nuts?
A Hex Nut is a six-sided internally threaded fastener engineered to pair with bolts, screws, or studs, forming a secure and detachable joint. Its hexagonal design provides excellent grip and torque, enabling quick tightening and loosening with standard tools.
Whether used in load-bearing structures or precision assemblies, hex nuts ensure dependable performance and long-term fastening reliability.
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 2, 5, 8, 10, 12 |
| PN Ratings | – | PN6, PN10, PN16, PN25, PN40, PN64 |
| Product Types | Hex Nut Types | Standard Hex Nut, Heavy Hex Nut, Jam Nut, Flange Nut, Lock Nut |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Carbon Steel | ASTM A194, ASTM A563, ASTM A105 | |
| Alloy Steel | Alloy Steel Grade 8, ASTM A194 Grade 2H | |
| Other Materials | Brass, Bronze, Monel, Nickel, Titanium | |
| Standards & Certifications | ASTM | ASTM A194, ASTM A563, ASTM A105 |
| ASME / ANSI | ASME B18.2.2, ASME B18.2.4.6 | |
| European Standards | DIN 934, EN 24032 | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175 | |
| Design Features | Thread Type | Full Threaded, Partially Threaded, Coarse, Fine |
| Tolerance | As per ISO, ANSI, DIN standards | |
| Surface Treatment | Plain, Zinc Plated, Nickel Plated, Hot Dip Galvanized, Passivated | |
| Coating & Surface Finish | Anti-Corrosion Coating | Zinc, Nickel, PTFE, Passivation |
| Optional Coatings | Black Oxide, Phosphate, Epoxy | |
| Surface Finish | Plain, Polished, Passivated | |
| Testing & Inspection | Mechanical Testing | Tensile Strength, Hardness, Yield Strength |
| Non-Destructive Testing | Visual Inspection, Thread Gauge, Magnetic Particle Testing (if applicable) | |
| Destructive Testing | Tensile, Hardness, Impact |
Dimensions
| Nominal Size (M) | Thread Pitch (mm) | Across Flats (AF, mm) | Across Corners (AC, mm) | Height (H, mm) | Weight per Nut (g) | Standard |
|---|---|---|---|---|---|---|
| M3 | 0.5 | 5.5 | 6.05 | 2.4 | 0.5 | ISO 4032 |
| M4 | 0.7 | 7 | 8 | 3 | 1.1 | ISO 4032 |
| M5 | 0.8 | 8 | 9.19 | 4 | 1.8 | ISO 4032 |
| M6 | 1.0 | 10 | 11.05 | 5 | 3 | ISO 4032 |
| M8 | 1.25 | 13 | 14.38 | 6.5 | 6 | ISO 4032 |
| M10 | 1.5 | 17 | 18.57 | 8 | 12 | ISO 4032 |
| M12 | 1.75 | 19 | 20.78 | 10 | 19 | ISO 4032 |
| M16 | 2.0 | 24 | 26.78 | 13 | 41 | ISO 4032 |
| M20 | 2.5 | 30 | 33.06 | 16 | 75 | ISO 4032 |
| M24 | 3.0 | 36 | 39.6 | 19 | 125 | ISO 4032 |
| M30 | 3.5 | 46 | 50.56 | 24 | 230 | ISO 4032 |
| M36 | 4.0 | 55 | 60.33 | 30 | 400 | ISO 4032 |
| M42 | 4.5 | 65 | 71.11 | 34 | 630 | ISO 4032 |
| M48 | 5.0 | 75 | 82.05 | 38 | 950 | ISO 4032 |
| M56 | 5.5 | 85 | 93 | 45 | 1450 | ISO 4032 |
| M64 | 6.0 | 95 | 104.6 | 50 | 2100 | ISO 4032 |
| M72 | 6.0 | 105 | 116 | 55 | 2900 | ISO 4032 |
| M80 | 6.0 | 120 | 132 | 60 | 4000 | ISO 4032 |
| M90 | 6.0 | 130 | 143 | 70 | 5400 | ISO 4032 |
| M100 | 6.0 | 150 | 165 | 75 | 7000 | ISO 4032 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 400 – 800 | MPa (Carbon Steel, Stainless Steel, Alloy Steel) |
| Yield Strength | 200 – 500 | MPa |
| Hardness | 120 – 250 | HB (Brinell) |
| Elongation | ≥ 15 – 30 | % |
| Density | 7.8 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 20 – 70 | J (Charpy, grade-dependent) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 200 – 450 | MPa |
| Corrosion Resistance | Good to Excellent (SS > CS > Alloy Steel) | – |
| Thermal Conductivity | 15 – 50 | W/m·K |
| Coefficient of Thermal Expansion | 10 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.40 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 250 | HB |
| Surface Finish | Plain / Machined / Zinc Plated / Hot Dip Galvanized | – |
| Thread Type | Coarse / Fine / Metric / UNC / UNF | – |
| Operating Temperature Range | -50 to 600 | °C (material-dependent) |
| Standard | ISO 4032, DIN 934, ANSI B18.2.2 | – |
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 Nuts
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
Why is the hex nut shape preferred in fastening?
Can I get hex nuts in stainless steel or special coatings?
Do you support custom threads or non-standard sizes?
Are hex nuts available for bulk and export orders?
