Studs
What are Studs?
Studs are long threaded rods or shafts with threads on both ends or continuously along the entire length. Unlike bolts, studs do not have a head and are used where high-strength clamping is required between heavy components, such as engines, piping, or structural parts. Studs are ideal for precise torque applications, often paired with nuts on both ends.
Asiad Steel Industries is a trusted manufacturer, supplier, and exporter of high-strength studs, crafted for superior performance in heavy-duty, high-pressure, and high-temperature applications.
Key Features
Leak-Proof
Jointing
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Diameter | M6 to M100 (¼” to 4”) |
| Length | 20 mm to 6000 mm (custom cut lengths available) | |
| Thread Types | Metric Threads | ISO Metric (Coarse & Fine) – per ISO 261 / ISO 965 |
| Unified Threads | UNC, UNF per ASME B1.1 | |
| Special Threads | ACME, Buttress, Left-Hand threads on request | |
| Stud Types | Full Threaded Studs | Threads along entire length |
| Double End Studs | Threads on both ends with unthreaded shank in the middle | |
| Tap End Studs | Short thread on one end, long thread on the other for equipment mounting | |
| Continuous Thread Rods | Supplied in long bars, cut to required lengths | |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Carbon Steel | ASTM A193 Grade B7, B7M, B16 | |
| Alloy Steel | ASTM A193 Grade B16, 4140/4142 quenched & tempered | |
| Duplex & Super Duplex | Duplex 2205, Super Duplex 2507 | |
| Other Materials | Inconel 600/625/718, Monel 400/K500, Titanium Gr.2/5, Hastelloy C22/C276 | |
| Standards & Certifications | ASME / ANSI | ASME B1.1 (Unified Threads), ASME B18.31.2 (Studs) |
| ASTM | ASTM A193 / A320 (High-temp & low-temp service) | |
| DIN / ISO | DIN 976 (Threaded Rods), ISO 898-1 (Mechanical Properties) | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175, IBR Approved | |
| Design Features | Ends | Chamfered, Rounded, or Cut Square |
| Strength Grades | 4.8, 8.8, 10.9, 12.9 (per ISO 898-1) | |
| Heat Treatment | Quenched & Tempered, Solution Annealed | |
| Surface Tolerance | As per ISO 4759 / ASME B18.31.2 | |
| Coating & Surface Finish | Anti-Corrosion Coating | Black Oxide, Zinc Plated, Hot-Dip Galvanized |
| Optional Coatings | PTFE (Xylan), Cadmium, Nickel, Dacromet | |
| Surface Finish | Self-Colored, Polished, Passivated | |
| Testing & Inspection | Mechanical Testing | Tensile, Proof Load, Hardness |
| Non-Destructive Testing | Ultrasonic, Magnetic Particle, Dye Penetrant | |
| Destructive Testing | Wedge Test, Impact Test |
Dimensions
| Stud Diameter (Nominal Size) | Pitch (mm) | Across Flats (Nut Size, mm) | Across Corners (Nut, mm) | Standard Lengths (mm) | Length Tolerance (mm) |
|---|---|---|---|---|---|
| M6 | 1.0 | 10 | 11.05 | 20 – 200 | ±1.0 |
| M8 | 1.25 | 13 | 14.38 | 25 – 300 | ±1.5 |
| M10 | 1.5 | 17 | 18.90 | 30 – 400 | ±1.5 |
| M12 | 1.75 | 19 | 21.10 | 40 – 500 | ±2.0 |
| M16 | 2.0 | 24 | 26.75 | 50 – 600 | ±2.0 |
| M20 | 2.5 | 30 | 32.95 | 60 – 800 | ±2.5 |
| M24 | 3.0 | 36 | 39.55 | 80 – 1000 | ±3.0 |
| M27 | 3.0 | 41 | 45.20 | 100 – 1200 | ±3.0 |
| M30 | 3.5 | 46 | 50.85 | 120 – 1600 | ±3.5 |
| M36 | 4.0 | 55 | 60.79 | 150 – 2000 | ±4.0 |
| M42 | 4.5 | 65 | 71.30 | 200 – 2500 | ±4.5 |
| M48 | 5.0 | 75 | 82.60 | 250 – 3000 | ±5.0 |
| M56 | 5.5 | 85 | 93.00 | 300 – 4000 | ±6.0 |
| M64 | 6.0 | 95 | 104.0 | 400 – 6000 | ±6.0 |
| M72 | 6.0 | 105 | 115.0 | 500 – 6000 | ±6.0 |
| M80 | 6.0 | 115 | 126.0 | 600 – 6000 | ±6.0 |
| M90 | 6.0 | 130 | 142.0 | 600 – 6000 | ±6.0 |
| M100 | 6.0 | 145 | 156.0 | 600 – 6000 | ±6.0 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 400 – 1100 | MPa (depends on material: MS, SS 304/316, Alloy Steel, High-Tensile grades) |
| Yield Strength | 240 – 900 | MPa |
| Hardness | 120 – 340 | HB (Brinell) |
| Elongation | ≥ 12 – 25 | % |
| Density | 7.8 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 27 – 80 | J (Charpy, grade-dependent) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 150 – 450 | MPa |
| Corrosion Resistance | Moderate to Excellent | (coated or stainless grades) |
| Thermal Conductivity | 15 – 55 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.55 – 0.75 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 340 | HB |
| Surface Finish | Zinc plated, Galvanized, Black oxide, Polished SS | – |
| Operating Temperature Range | -50 to 450 | °C (depends on grade) |
| Standards Covered | DIN, ISO, ASTM, ASME, BS | – |
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 Studs
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
When should I use a stud instead of a bolt?
Can studs be supplied in custom lengths or grades?
What are double-end studs used for?
Do you offer traceability for critical-use studs?
