Nuts
What are Nuts?
Nuts are internally threaded fasteners designed to mate with bolts, screws, or studs, creating a secure and detachable joint. They are used across a wide range of industries to clamp components together and provide structural stability in machines, assemblies, and frameworks. Available in various materials like carbon steel, alloy steel and more, nuts come in multiple shapes and designs to suit different engineering and installation needs.
Whether used in automotive manufacturing or heavy structural projects, nuts offer reliable fastening strength and compatibility with a wide range of threaded components.
Key Features
Leak-Proof
Jointing
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Diameter (Metric) | M6 to M100 |
| Nominal Diameter (Inch) | ¼” to 4” | |
| Pressure Ratings | Applicable Classes | Class 150, 300, 600, 900, 1500, 2500 (when used with flanges & fittings) |
| Strength Grades | 4.6, 8.8, 10.9, 12.9 (as per ISO / DIN standards) | |
| Nut Types | Standard Hex Nuts | DIN 934, ISO 4032 |
| Heavy Hex Nuts | ASME B18.2.2 | |
| Lock Nuts | Nylon Insert Lock Nut, All-Metal Lock Nut | |
| Dome / Cap Nuts | DIN 1587 | |
| Coupling Nuts | Long Nuts for joining threaded rods | |
| Wing Nuts | Hand-tightening applications | |
| Square & Flange Nuts | Square: Traditional / Structural fastening; Flange Nuts: With integrated washer face | |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Carbon Steel | ASTM A563, ASTM A194 | |
| Alloy Steel | ASTM A194 Grade 2H, 2HM, 7, 7M | |
| Duplex & Super Duplex | Duplex 2205, Super Duplex 2507 | |
| Other Materials | Monel 400/K500, Inconel 600/625/825, Nickel 200/201, Titanium (Grade 2, Grade 5) | |
| Standards & Certifications | ASME / ANSI | ASME B18.2.2 (Square & Hex Nuts), ASME B18.16 (Lock Nuts) |
| ASTM | ASTM A563, ASTM A194 | |
| ISO / DIN | ISO 4032, DIN 934, DIN 1587 | |
| Certifications | — | ISO 9001, PED 2014/68/EU, NACE MR0175, IBR Approved |
| Design Features | Threads | Metric (M), Unified National (UNC/UNF), BSW, BSP |
| Tolerance | As per ISO 4759 / ASME B18.2.2 | |
| Finish | Machined, Cold-Formed, Hot-Forged | |
| Coating & Surface Finish | Anti-Corrosion Coating | Zinc Plated, Hot-Dip Galvanized, Black Oxide |
| Optional Coatings | PTFE, Cadmium Plating, Epoxy | |
| Surface Finish | Polished, Passivated, Self-Colour | |
| Testing & Inspection | Mechanical Testing | Tensile Strength, Proof Load, Hardness |
| Non-Destructive Testing | Magnetic Particle (MPI), Ultrasonic (UT), Dye Penetrant (DPT) | |
| Destructive Testing | Wedge Load Test, Proof Load Test |
Dimensions
| Nut Size | Thread Pitch | F | E | T | ||
|---|---|---|---|---|---|---|
| Width Across Flats | Width Across Corners | Thickness of the Nut | ||||
| max. | min. | min. | max. | min. | ||
| M1.6 | 0.35 | 3.20 | 3.02 | 3.41 | 1.30 | 1.05 |
| M2 | 0.4 | 4.00 | 3.82 | 4.32 | 1.60 | 1.35 |
| M2.5 | 0.45 | 5.00 | 4.82 | 5.45 | 2.00 | 1.75 |
| M3 | 0.5 | 5.50 | 5.32 | 6.01 | 2.40 | 2.15 |
| M3.5* | 0.6 | 6.00 | 5.82 | 6.58 | 2.80 | 2.55 |
| M4 | 0.7 | 7.00 | 6.78 | 7.66 | 3.20 | 2.90 |
| M5 | 0.8 | 8.00 | 7.78 | 8.79 | 4.70 | 4.40 |
| M6 | 1 | 10.00 | 9.78 | 11.05 | 5.20 | 4.90 |
| M8 | 1.25 | 13.00 | 12.73 | 14.38 | 6.80 | 6.44 |
| M10 | 1.5 | 16.00 | 15.73 | 17.77 | 8.40 | 8.04 |
| M12 | 1.75 | 18.00 | 17.73 | 20.03 | 10.80 | 10.37 |
| M14* | 2 | 21.00 | 20.67 | 23.36 | 12.80 | 12.10 |
| M16 | 2 | 24.00 | 23.67 | 26.75 | 14.80 | 14.10 |
| M18* | 2.5 | 27.00 | 26.16 | 29.56 | 15.80 | 15.10 |
| M20 | 2.5 | 30.00 | 29.16 | 32.95 | 18.00 | 16.90 |
| M22* | 2.5 | 34 | 33 | 37.29 | 19.40 | 18.10 |
| M24 | 3 | 36 | 35 | 39.55 | 21.50 | 20.20 |
| M27* | 3 | 41 | 40 | 45.20 | 23.80 | 22.50 |
| M30 | 3.5 | 46 | 45 | 50.85 | 25.60 | 24.30 |
| M33* | 3.5 | 50 | 49 | 55.37 | 28.70 | 27.40 |
| M36 | 4 | 55.00 | 53.80 | 60.79 | 31.00 | 29.40 |
| M39* | 4 | 60.00 | 58.80 | 66.44 | 33.40 | 31.80 |
| M42 | 4.5 | 65.00 | 63.10 | 71.30 | 34.00 | 32.40 |
| M45* | 4.5 | 70.00 | 68.10 | 76.95 | 36.00 | 34.40 |
| M48 | 5 | 75.00 | 73.10 | 82.60 | 38.00 | 36.40 |
| M52* | 5 | 80.00 | 78.10 | 88.25 | 42.00 | 40.40 |
| M56 | 5.5 | 85.00 | 82.80 | 93.56 | 45.00 | 43.40 |
| M60* | 5.5 | 90.00 | 87.80 | 99.21 | 48.00 | 46.40 |
| M64 | 6 | 95.00 | 92.80 | 104.86 | 51.00 | 49.10 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 400 – 1000 | MPa (depends on material & grade: MS, SS 304/316, Alloy Steel) |
| Yield Strength | 240 – 650 | MPa |
| Hardness | 120 – 320 | HB (Brinell) |
| Elongation | ≥ 15 – 25 | % |
| Density | 7.8 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 27 – 80 | J (Charpy, varies with grade) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 150 – 400 | MPa |
| Corrosion Resistance | Moderate to Excellent | (depends on coating / SS grade) |
| Thermal Conductivity | 15 – 55 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.55 – 0.65 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 320 | HB |
| Surface Finish | Zi | – |
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 Nuts
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What are the most commonly used types of nuts?
Do you offer anti-vibration or locking nut options?
Can I order nuts with customized threads or coatings?
Do you supply nuts in bulk for industrial procurement?
