What standards and grades do your alloy steel fasteners conform to?

Our alloy steel fasteners are manufactured in accordance with ASTM A193 (B7, B7M, B16), ASTM A320 (L7, L7M, L43), ASTM A194 (2H, 2HM, 4, 7), ASTM A563, and ASME SA563 (Grades F1, F5, F9, F12, F91), as well as international DIN and ISO specifications.

What technical quality documentation is provided with international shipments?

Every shipment is accompanied by EN 10204 3.1 Material Test Certificates (MTC), full chemical and mechanical testing reports, heat-number traceability marks, NABL accredited laboratory test results, and third-party inspection reports (TPI) such as TUV, SGS, or Bureau Veritas upon request.

What surface coatings are available for corrosion protection on alloy steel fasteners?

We offer protective surface treatments including PTFE / Xylan coating, Hot-Dip Galvanizing (HDG to ASTM A153), Electro-Zinc Plating, Zinc-Nickel Plating, Cadmium Plating, and Phosphate coating to withstand aggressive marine and chemical environments.

Can you manufacture non-standard alloy steel fasteners according to custom engineering drawings?

Yes, our advanced CNC machining and hot-forging facility produces custom alloy steel fasteners, non-standard thread pitches, oversize diameters, and specific lengths strictly according to client-provided drawings and technical datasheets.

Alloy Steel Fasteners Manufacturer & Exporter in India

ISO 9001:2015 Certified Manufacturer

High-Strength Alloy Steel Fasteners Manufacturer & Exporter

Stud Bolt India is a premier Alloy Steel Fasteners Manufacturer and Global Exporter based in Mumbai, India. We specialize in producing precision-engineered, high-tensile alloy steel bolting components engineered specifically for extreme pressure, elevated temperature, and sub-zero service conditions. Our comprehensive product inventory includes alloy steel stud bolts, heavy hex bolts, socket cap screws, heavy hex nuts, hardened flat washers, and fully threaded rods conforming to ASTM, ASME, DIN, ISO, and BS standards.

Manufactured using premium alloy steels such as Chrome-Moly (Cr-Mo) and Nickel-Chromium-Molybdenum grades (including ASTM A193 B7, B7M, B16, ASTM A320 L7, L7M, L43, and ASTM A563 / ASME SA563 Grades F1, F5, F9, F12, F91), our fasteners offer exceptional yield strength, superior fatigue resistance, and outstanding structural integrity for oil refineries, chemical processing plants, power stations, and heavy engineering projects worldwide.

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High-Performance Alloy Steel Fastener Range

We supply a full spectrum of high-grade alloy steel fastening components tailored for high-load pressure vessels, piping flanges, turbine casings, and structural joints:

Alloy Steel Stud Bolts

Fully threaded studs and double-end studs engineered for ASME B16.5 high-pressure pipe flanges and pressure vessel assemblies.

Alloy Steel Hex Bolts

Heavy hex and standard hex cap screws manufactured in grades 8.8, 10.9, 12.9, ASTM A193 B7, and ASTM A320 L7.

Alloy Steel Heavy Hex Nuts

Quenched and tempered high-strength nuts conforming to ASTM A194 Grades 2H, 2HM, 4, 7, 7M, and ASME SA563 F9/F91.

Alloy Steel Screws

Socket head cap screws, countersunk screws, machine screws, and Allen cap screws designed for high-stress mechanical equipment.

Alloy Steel Threaded Rods

Metric and imperial continuous threaded bars supplied to DIN 975/976 and ASTM A193 B7/B16 up to 3-meter lengths.

Alloy Steel Washers

ASTM F436 hardened flat washers, spring lock washers, and heavy-duty ogee washers providing optimal bolt tension retention.

Technical Specifications & Manufacturing Standards

Our manufacturing facility strictly adheres to international metallurgical and dimensional standards to ensure flawless performance in critical service applications.

Specification Category	Technical Details & International Standards
Manufacturing Standards	ASTM A193, ASTM A194, ASTM A320, ASTM A563, ASME SA563, ASME B18.2.1, ASME B18.2.2, ASME B18.31.2, DIN 931, DIN 933, DIN 934, DIN 975, ISO 4014, ISO 4032
Material Grades	ASTM A193 Grade B7, B7M, B16 \| ASTM A320 Grade L7, L7M, L43 \| ASTM A194 Grade 2H, 2HM, 4, 7, 7M \| ASME SA563 Grade F1, F5, F9, F12, F91 \| Property Class 8.8, 10.9, 12.9
Diameter Size Range	Metric: M3 to M100 \| Imperial: 1/8" to 4" Inches (Custom sizes available upon request)
Length Range	3 mm to 3000 mm / Up to 12 Feet cut lengths
Thread Types	UNC, UNF, UNEF, Metric Coarse, Metric Fine, BSW, 8-UN Series (ASME B1.1 Class 2A/2B fit)
Protective Coatings	PTFE / Xylan 1424 Coated, Hot-Dip Galvanized (HDG to ASTM A153), Electro-Zinc Plated, Zinc-Nickel (Zn-Ni), Cadmium Plated, Black Oxide, Phosphate Coated
Quality Testing & Certifications	EN 10204 3.1 MTC, 100% PMI Testing, Hardness Testing (HRC/HBW), Charpy V-Notch Impact Test, Microstructure Analysis, NABL Lab Reports, TPI (SGS, TUV, BV)

Mechanical Properties of Key Alloy Steel Grades

Every lot of alloy steel material undergoes rigorous tensile, yield, elongation, and impact testing to comply with international specifications:

Grade Designation	Tensile Strength (MPa)	Yield Strength Min. (MPa)	Elongation Min. (%)	Hardness (Max.)
ASTM A193 Grade B7 (≤ 2.5")	860 (125 ksi)	720 (105 ksi)	16%	321 HBW / 35 HRC
ASTM A320 Grade L7	860 (125 ksi)	720 (105 ksi)	16%	321 HBW (-101°C Impact Test)
Alloy Steel Grade F1	485	275	20%	217 HBW
Alloy Steel Grade F5	485	275	20%	217 HBW
Alloy Steel Grade F9	585	380	20%	241 HBW
Alloy Steel Grade F12	415	220	20%	217 HBW
Alloy Steel Grade F91	585	415	20%	250 HBW

Chemical Composition Analysis (%)

Grade	Carbon (C)	Manganese (Mn)	Silicon (Si)	Chromium (Cr)	Molybdenum (Mo)	Phosphorus (P)	Sulfur (S)
Grade B7 / B7M	0.37 - 0.49	0.65 - 1.10	0.15 - 0.35	0.75 - 1.20	0.15 - 0.25	≤ 0.035	≤ 0.040
Grade F1	0.28 max	0.60 - 0.90	0.15 - 0.30	-	0.44 - 0.65	≤ 0.045	≤ 0.045
Grade F5	0.15 max	0.30 - 0.60	0.50 max	4.00 - 6.00	0.44 - 0.65	≤ 0.030	≤ 0.030
Grade F9	0.15 max	0.30 - 0.60	0.50 - 1.00	8.00 - 10.00	0.90 - 1.10	≤ 0.030	≤ 0.030
Grade F12	0.05 - 0.15	0.30 - 0.60	0.50 max	1.00 - 1.50	0.44 - 0.65	≤ 0.045	≤ 0.045
Grade F91	0.08 - 0.12	0.30 - 0.60	0.20 - 0.50	8.00 - 9.50	0.85 - 1.05	≤ 0.020	≤ 0.010

Quality Control & Export Packaging Standards

At Stud Bolt India, maintaining world-class quality control is fundamental to our operation. Every batch of alloy steel fasteners undergoes chemical verification via Spectrometer, ultrasonic flaw detection, thread pitch micrometer inspection, and mechanical hardness testing before packing.

Material Traceability & MTC

Full heat-number embossing ensures complete traceability from the steel melt shop to the final installed bolt. Every shipment is supplied with authentic EN 10204 3.1 mill test reports detailing chemical analysis, mechanical values, and heat treatment charts.

Seaworthy Export Packaging

Fasteners are rust-protected with anti-corrosion oil, shrink-wrapped in heavy-duty plastic sleeves, packed in corrugated cardboard boxes, and secured insideISPM-15 compliant fumigated wooden crates or steel-strapped pallets for ocean and air transit.

Global Industrial Applications

Our alloy steel fasteners are extensively deployed across critical engineering sectors that demand absolute dependability under severe operating parameters:

Global Export Destinations

Stud Bolt India regularly exports high-tensile alloy steel bolts, nuts, and stud bolts to engineering procurement companies (EPC), stockists, and industrial end-users in over 24 countries across North America, Europe, the Middle East, and Asia-Pacific.

United States United Arab Emirates Saudi Arabia Qatar Kuwait Oman United Kingdom Germany Italy Singapore Malaysia Australia Canada Brazil

Request Technical Quotation for Alloy Steel Fasteners

Need custom sizes, specialized coatings (Xylan/PTFE), or urgent project deliveries? Contact our engineering sales specialists for fast B2B export quotes.