Bolts
What are Bolts?
Bolts are externally threaded fasteners used with nuts (or threaded holes) to create strong, tension-bearing joints. They are used in nearly every mechanical, civil, and structural application where durable, removable connections are needed.
Asiad Steel Industries is a leading manufacturer, supplier, and exporter of high-quality bolts in various types, sizes, grades, and finishes, delivering reliable fastening solutions across multiple industries worldwide.
Key Features
Leak-Proof
Jointing
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Diameter | M3 to M100 (metric) / 1/8” to 4” (imperial) |
| Length | 6 mm to 1000 mm (custom sizes available) | |
| Thread Types | Metric Threads | Coarse (M), Fine (MF), Extra Fine (MEF) |
| Unified Threads | UNC, UNF, UNEF | |
| Other Options | BSW, BSF, Acme, ISO, Left-Hand Threads | |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321, SS 410, SS 904L |
| Carbon Steel | ASTM A307, A325, A490 | |
| Alloy Steel | ASTM A193 Grade B7, B16, L7 | |
| Duplex & Super Duplex | Duplex 2205, Super Duplex 2507 | |
| Standards & Certifications | International Standards | ISO 898-1, ISO 4014/4017, DIN 931/933, ASTM A193, ASTM A320, BS 3692, JIS B1180 |
| Certifications | ISO 9001, CE Marking, PED 2014/68/EU, NACE MR0175, IBR Approved | |
| Bolt Types | Hex Bolt | Standard hexagonal head bolts for structural & general applications |
| U-Bolt | U-shaped bolts for piping, support systems & anchoring | |
| Strength Grades | Carbon & Alloy Steel | Grade 4.6, 8.8, 10.9, 12.9 |
| Stainless Steel | A2-50, A2-70, A4-70, A4-80 | |
| Coating & Surface Finish | Standard Finish | Self-Colored, Polished |
| Protective Coatings | Zinc Plated, Hot-Dip Galvanized, Black Oxide | |
| Specialized Coatings | PTFE, Xylan, Geomet, Epoxy | |
| Design Features | Shank Types | Full Threaded, Partially Threaded |
| Drive Types | Hex, Allen/Socket, Torx, Slotted, Phillips | |
| Tolerance | As per ISO, DIN, and ANSI standards | |
| Testing & Inspection | Mechanical Testing | Tensile, Hardness, Proof Load |
| Non-Destructive Testing | Ultrasonic, Magnetic Particle (MPI), Dye Penetrant (DPT) | |
| Corrosion Testing | Salt Spray Test, Humidity Test |
Dimensional Standards ANSI B18.21
| Nominal Size of Basic Bolt Dia. | Body Dia. (E) | Width Across Flats (F) | Width Across Corners (G) | Height (H) | Radius of Fillet (R) | Thread Length (LT) | Transition Thread Length (Y) | Runout of Bearing Surface FIR |
|---|---|---|---|---|---|---|---|---|
| Max | Min | Basic | Max | Min | Max | Min | Basic | |
| ½ | 0.5000 | 0.515 | 0.482 | 7/8 | 0.875 | 0.850 | 1.010 | 0.969 |
| ⅝ | 0.6250 | 0.642 | 0.605 | 1 1/16 | 1.062 | 1.031 | 1.227 | 1.175 |
| ¾ | 0.7500 | 0.768 | 0.729 | 1 1/4 | 1.250 | 1.212 | 1.443 | 1.383 |
| ⅞ | 0.8750 | 0.895 | 0.852 | 1 7/16 | 1.438 | 1.394 | 1.660 | 1.589 |
| 1 | 1.0000 | 1.022 | 0.976 | 1 5/8 | 1.625 | 1.575 | 1.876 | 1.796 |
| 1 1/8 | 1.1250 | 1.149 | 1.098 | 1 13/16 | 1.812 | 1.756 | 2.093 | 2.002 |
| 1 1/4 | 1.2500 | 1.277 | 1.223 | 2 | 2.000 | 1.938 | 2.309 | 2.209 |
| 1 3/8 | 1.3750 | 1.404 | 1.345 | 2 3/16 | 2.188 | 2.119 | 2.526 | 2.416 |
| 1 1/2 | 1.5000 | 1.531 | 1.470 | 2 3/8 | 2.375 | 2.300 | 2.742 | 2.622 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 400 – 1200 | MPa (depends on grade: MS, SS 304/316, Alloy Steel, High-Tensile) |
| 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, varies with grade) |
| Modulus of Elasticity (E) | ~200 | GPa |
| Fatigue Strength | 150 – 450 | MPa |
| Corrosion Resistance | Moderate to Excellent | (MS, coated, or stainless steel 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, Hot-dip galvanized, Black oxide, Polished SS | – |
| Operating Temperature Range | -50 to 450 | °C (material dependent) |
| 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 |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | A307 / A325 / A490 |
| DIN | 933 / 931 / 912 |
| ISO | 4014 / 4017 / 4762 |
| JIS | B1180 |
| BS | 3692 / 4190 |
Applications of Bolts
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What types of bolts are best for structural applications?
Do you provide bolts with certification and traceability?
Can bolts be customized in terms of thread length and head design?
Do you export bolts globally?
