Our Alloy Steel Fasteners are precision-engineered to provide maximum clamping force and structural reliability in extreme environments where standard fasteners would fail due to creep or thermal expansion.
Manufactured from heat-treated Chrome-Molybdenum alloy steel, these fasteners are essential for securing high-pressure pipe flanges, pressure vessels, and turbine casings. Our bolting solutions maintain their high tensile strength and fatigue resistance even at sustained operating temperatures up to 600°C. By utilizing controlled quenching and tempering processes, we ensure a uniform crystalline structure that prevents hydrogen embrittlement and stress corrosion cracking in aggressive industrial services.
We supply a massive range of ASTM A193 B7 and B16 Stud Bolts paired with ASTM A194 Grade 2H and Grade 7 Heavy Hex Nuts. Available in various finishes including Zinc plating, PTFE coating (Xylan), and Hot Dip Galvanizing, our fasteners are designed for easy breakout and corrosion protection. Every fastener is rigorously tested for hardness, proof load, and dimensional accuracy to comply with ASME B18.2.1 and B18.2.2 standards, ensuring total safety in critical energy and petrochemical infrastructures.
| Specification | Technical Details |
|---|---|
| Bolting Standards | ASTM A193, A320 (Low Temp), ASME B18.2.1 (Heavy Hex Bolts) |
| Nut Standards | ASTM A194, ASME B18.2.2 (Heavy Hex Nuts) |
| Available Bolting Grades | Grade B7, B7M, B16, L7, L7M (Chrome-Moly High Tensile) |
| Available Nut Grades | Grade 2H, 2HM, Grade 4, Grade 7, 7M (Quenched & Tempered) |
| Fastener Types | Stud Bolts (Fully Threaded), Heavy Hex Bolts, Cap Screws, Eye Bolts, U-Bolts, Spring Washers |
| Size Range | Diameter: M6 to M100 | 1/4" to 4" Inch sizes (Custom lengths available) |
| Thread Types | UNC (Unified Coarse), UNF (Fine), 8-UN (Constant Pitch), Metric Coarse/Fine |
| Surface Coatings | PTFE/Xylan Coating, Zinc Plating (Cr3+), Cadmium, Hot Dip Galv (HDG), Manganese Phosphating |
| Mechanical Testing | Tensile Strength Test, Yield Strength, Proof Load, Hardness (Brinell/Rockwell), Charpy V-Notch |
| Industry Compliance | NACE MR0175 (H2S Compliance), ISO 9001:2015, CE Certified |
| Standard / Classification | Available Material Grades & Engineering Attributes |
|---|---|
| ASTM A193 (High-Temp Bolting) | Grade B7, B7M, B16, B5, B6 (Chrome-Moly High Tensile Studs) |
| ASTM A320 (Low-Temp Bolting) | Grade L7, L7M, L43 (Impact tested for cryogenic service) |
| ASTM A194 (Nut Standards) | Grade 2H, 2HM, Grade 4, Grade 7, 7M (Heavy Hex High-Strength Nuts) |
| Dimensional Standards | ASME B18.2.1 (Bolts), ASME B18.2.2 (Nuts), ASME B18.3 (Cap Screws) |
| Thread Standards | UNC, UNF, 8-UN (Constant Pitch for High Pressure), Metric Coarse/Fine |
| Surface Protection Coatings | PTFE/Xylan (Blue/Green), Hot Dip Galvanized (HDG), Zinc (Cr3+), Cadmium |
| Mechanical Properties | Tensile Strength up to 125 ksi (B7), Yield Strength, Proof Load Testing |
| NACE Compliance | NACE MR0175 / ISO 15156 Compliance for Sour Gas (H2S) Service |
| Quality Certification | EN 10204 3.1 / 3.2 MTC, PMI Tested, 100% Thread Gauging |
The industry standard for flange bolting. Fully threaded rods designed to distribute tension evenly across high-pressure gaskets.
High-strength nuts with a larger width across flats than standard nuts, providing better load distribution and resistance to stripping.
Engineered for heavy-duty structural joints and machinery. Features a robust head design for high-torque industrial tightening.
Used in precision machinery and tight clearance applications. Internal hex drive allows for high-torque fastening in confined spaces.
Versatile alloy rods available in lengths up to 6 meters. Ideal for custom anchoring, supports, and specialized fabrication projects.
Hardened flat and spring washers designed to maintain preload and prevent loosening due to thermal expansion or vibration.
Dhanavir Steel is a premier stockholder and global supplier of high-performance Stainless Steel, Special Alloys and Nickel Alloys.
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Dhanavir Steel provides end-to-end industrial steel solutions, specializing in Pipes, Fittings, and Flanges. We combine technical expertise in NACE and IBR testing with a robust global supply chain to deliver quality-assured materials for demanding environments.
Dhanavir Steel provides end-to-end industrial steel solutions, specializing in Pipes, Fittings, and Flanges. We combine technical expertise in NACE and IBR testing with a robust global supply chain to deliver quality-assured materials for demanding environments.