Premier Manufacturer & Global Exporter of Carbon Steel Fasteners
Stud Bolt India is an established manufacturer and international exporter of high-grade Carbon Steel Fasteners (CS Fasteners) engineered for heavy engineering, construction, oil and gas, petrochemical, and power generation infrastructure. Operating from our ISO-certified manufacturing hub in Mumbai, India, we produce precision industrial fasteners utilizing state-of-the-art cold forging, hot forging, thread rolling, and CNC machining technologies.
Our carbon steel fastening portfolio encompasses low carbon, medium carbon, and high carbon steel grades designed to meet rigorous tensile strength, yield strength, and shear load requirements. Manufactured in compliance with ASTM A307 (Grades A & B), ASME SA307, ASTM A563, ASTM F844, DIN 931/933/934, and ISO 4014/4017 standards, every lot undergoes stringent mechanical testing and mill traceability verification before international dispatch.
Industrial Range of Carbon Steel Fasteners
We supply a comprehensive suite of standardized and custom carbon steel fastening components tailored to client engineering specifications and drawings:
Carbon Steel Bolts
Hex bolts, heavy hex structural bolts, carriage bolts, flange bolts, and eye bolts manufactured to ASTM A307 Grade A & B, Property Class 4.8, 8.8, and 10.9 with precise thread tolerances.
Carbon Steel Nuts
Standard hex nuts, heavy hex nuts, lock nuts, coupling nuts, and castle nuts to ASTM A563 (Grades A, B, C) and DIN 934, ensuring optimal thread mating and clamping load performance.
Carbon Steel Stud Bolts
Continuous thread stud bolts, double-end studs, and tap-end studs engineered to ASME B18.31.2 for high-pressure flanged joint connections in piping and vessel assemblies.
Threaded Rods & Bars
Fully threaded studs and metric/unc threaded bars manufactured to DIN 975 / DIN 976 standards, available in custom lengths up to 3 meters with cut-to-length capabilities.
Carbon Steel Washers
Plain flat washers, spring lock washers, heavy hardened washers (ASTM F436), square plate washers, and bevel washers designed for effective load distribution.
Industrial Screws & Anchors
Socket cap screws, set screws, machine screws, self-tapping screws, as well as L-bolts, J-bolts, sleeve anchors, and wedge anchors for civil foundation tie-downs.
Technical Specifications & Engineering Data
Our carbon steel fasteners are engineered to perform across diverse thermal, structural, and atmospheric exposure conditions. Review key specifications below for procurement planning:
| Parameter | Manufacturing & Material Specifications |
|---|---|
| Standard Specifications | ASTM A307 (Gr. A & B), ASME SA307, ASTM A563, ASTM F844, DIN 931, DIN 933, DIN 934, DIN 975, ISO 4014 / 4017 |
| Property Classes / Grades | Grade A, Grade B, Grade C; ISO Property Classes 4.8, 5.8, 6.8, 8.8, 10.9 |
| Nominal Size Range | Metric: M3 to M100 | Imperial: 1/8" to 4" (Custom sizes manufactured to customer drawings) |
| Thread Profiles | UNC (Coarse), UNF (Fine), UN (8-Thread Series), Metric Coarse, Metric Fine (Pitch to ASME B1.1 / ISO 261) |
| Surface Coatings & Finishes | Plain / Light Oiled, Black Oxide, Hot-Dip Galvanized (HDG to ASTM A153), Electro-Zinc Plating (Yellow/Clear), PTFE / Xylan Fluoropolymer, Zinc-Nickel Plating |
| Testing & Inspection | Tensile Testing, Proof Load Testing, Hardness Testing (HRB/HRC), Dimensional Check, Thread Gauge (2A/2B, 6g/6H), PMI Raw Material Verification |
| Material Certification | EN 10204 Type 3.1 Inspection Certificate, Mill Test Reports (MTR), Third-Party Inspection Reports (SGS, TUV, BV, Lloyd's on request) |
Mechanical & Chemical Composition Overview
Understanding the metallurgical properties ensures proper fastener selection for structural joint integrity and load balance:
| Grade / Standard | Tensile Strength (min.) | Yield Strength (min.) | Elongation (min.) | Typical Hardness |
|---|---|---|---|---|
| ASTM A307 Grade A | 60 ksi (414 MPa) | Not Specified | 18% | 121 to 241 HBW |
| ASTM A307 Grade B | 60 to 100 ksi (414 - 689 MPa) | Not Specified | 18% | 121 to 241 HBW |
| ISO 898-1 Class 8.8 | 800 MPa (116 ksi) | 640 MPa (93 ksi) | 12% | 22 to 32 HRC |
| ISO 898-1 Class 10.9 | 1040 MPa (150 ksi) | 940 MPa (136 ksi) | 9% | 32 to 39 HRC |
Quality Assurance & Export Testing Standards
At Stud Bolt India, quality control is integrated into every stage of production. From raw material intake to final packaging, our inspection system ensures compliance with global engineering standardizations:
Global Export Packaging & Logistics Capabilities
To ensure our fasteners arrive damage-free at international job sites, we enforce stringent seaworthy export packaging standards. Products are coated with anti-rust oil, bundled in heavy-duty plastic bags, packed in strong corrugated cartons, and secured in heat-treated ISPM-15 compliant wooden crates or ISPM-15 wooden pallets.
We regularly export carbon steel fasteners to major industrial hubs across the Middle East (UAE, Saudi Arabia, Qatar, Kuwait, Oman), Europe (Germany, UK, Netherlands, Poland), North America (USA, Canada), Australia, and Southeast Asia.
Frequently Asked Questions
What international standards govern your carbon steel fasteners?
What surface coatings are available for corrosion protection on carbon steel fasteners?
Do you provide EN 10204 3.1 Material Test Reports (MTR) with export orders?
What size range and thread profiles do you manufacture in carbon steel?
Need High-Quality Carbon Steel Fasteners for Your Next Project?
Contact our technical sales team for immediate price quotations, material datasheets, mill test sample reports, and lead time confirmations tailored to your project requirements.
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