Chetak Steel, Hyderabad, is a leading manufacturer and supplier of premium Alloy Steel Gr B7 Fasteners. Known for precision, strength, and reliability, the company serves industries such as oil & gas, petrochemical, power generation, and heavy engineering. With advanced manufacturing facilities and stringent quality control, Chetak Steel ensures that every Gr B7 Fastener meets ASTM A193 standards and customer specifications. These fasteners are designed for high-pressure, high-temperature applications, providing excellent mechanical strength and corrosion resistance. Chetak Steel’s commitment to quality, durability, and timely delivery makes it a preferred supplier for critical industrial fastening solutions.
Alloy Steel Gr B7 Fasteners are medium-carbon chromium-molybdenum alloy steel products with controlled composition to provide high tensile strength, toughness, and hardness. They typically contain carbon (0.38–0.44%), chromium (0.80–1.10%), molybdenum (0.15–0.25%), and manganese (0.80–1.10%). Mechanically, these fasteners offer a minimum tensile strength of 125 ksi and superior yield strength, making them suitable for high-pressure and high-temperature environments. Heat treatment processes such as quenching and tempering enhance their mechanical properties, ensuring excellent performance, fatigue resistance, and durability in critical applications.
Specification :Â ASTM A193 / ASME SA193
Dimension :Â DIN, ISO, ASTM, JIS, BS, GB, IS and all International Standards
Size Range :Â M3 – M56 | 3/6″ to 2″ | Custom Sizes
Length :Â 3 mm to 200 mm
| Alloy Steel B7 | C | Mn | Si | P | S | Mo | Cr |
| 0.08-0.15 | 1.00 max | 1.00 max | 0.040 | 0.030 | 0.15-0.25 | 11.50-13.50 |
| Grade | Diameter | Tensile Strength | Yield Strength | Elongation | Reduction | Hardness |
| Grade B7 | M64 and under | 860 | 720 | 16 | 50 | 321 HBW or 35 HRC |
| Over M64 to M100 | 795 | 655 | 16 | 50 | 321 HBW or 35 HRC | |
| Over M100 to M180 | 690 | 515 | 18 | 50 | 321 HBW or 35 HRC |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
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Hexagon Bolts / Set Screws |
Stud Bolts |
Hexagon Nuts |
Socket Capscrews |
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DIN 931 |
BS4882 |
DIN 934 |
DIN 912 |
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DIN 933 |
DIN 976 |
BS 1768 |
DIN 6912 |
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BS 1768 |
BS 1769 |
DIN 7984 |
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UNI 5731 |
BS 1083 |
ANSI B18.3 |
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UNI 5739 |
BS 3692 |
ISO 4762 |
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ISO 4014 |
ISO 4032 |
UNI 5931 |
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ISO 4017 |
ISO 4033 |
BS 2470 |
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BS 1769 |
ANSI B18.2.2 |
BS 4168 |
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BS 3692 |
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ANSI B18.2.1 |
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Socket & Slotted Set Screws |
Socket & Slotted Countersunk Screws |
Studs |
Washers |
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DIN 913 |
DIN 963 |
DIN 938 |
DIN 125 |
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DIN 914 |
DIN 7991 |
DIN 939 |
DIN 9021 |
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DIN 915 |
BS 4168 |
DIN 2510 |
BS 4320 |
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DIN 916 |
BS 1981 |
BS 4439 |
BS 3410 |
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DIN 551 |
BS 483 |
BS 2693 |
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DIN 553 |
BS 2470 |
Spring Washers |
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DIN 438 |
DIN 127 |
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BS 4168 |
BS 4464 |
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BS 1802 |
Alloy Steel Gr B7 Fasteners are widely used in industries where high strength, reliability, and resistance to extreme conditions are essential. They are extensively applied in oil & gas pipelines, refineries, petrochemical plants, and pressure vessel assemblies. These fasteners are also used in power generation, chemical processing, and heavy engineering projects that require secure and durable connections under high pressure and temperature. Gr B7 fasteners are ideal for bolting flanges, valves, pumps, and critical structural joints. Their excellent mechanical strength, toughness, and heat-treated performance make them indispensable for safety-critical and high-performance industrial applications.
Chetak Steel is a leading manufacturer, supplier and exporter of high-quality Carbon Steel, Alloy Steel, Mild Steel and Galvanized Steel products. Our extensive product range includes Pipes, Tubes, Flanges, Pipe Fittings, Forged Fittings, Sheets and Plates, catering to various industries in Hyderabad, India.
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