Product Overview
Our ASTM A193 B7 Stud Bolts are high-strength fasteners manufactured from Chromium-Molybdenum alloy steel (4140). They are specifically designed for high-temperature and high-pressure service in Bolted Joints, such as pipeline flanges, pressure vessels, and valves in the Oil & Gas industry.
Russian Name: Шпилька резьбовая B7 / Шпилька для фланцевых соединений
Included Hardware: Usually supplied with two heavy hex nuts (ASTM A194 Grade 2H).
Key Features
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Extreme Durability: Quenched and tempered to handle high pressures and temperatures up to 450°C.
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Grade Options:
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Grade B7: The industry standard for general high-temp applications.
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Grade B7M: Lower hardness requirement for resistance to sulfide stress cracking (NACE MR0175 compliance).
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Grade L7: For low-temperature service (down to -100°C).
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Surface Treatment: Available in Black Oxide (Standard), Cadmium Plated, or Xylan/PTFE (Blue/Green) for superior corrosion resistance in offshore environments.
Technical Specifications
| Property | Specification |
| Product Name | Stud Bolt, Threaded Stud, Flange Bolt |
| Russian Name | Шпилька ГОСТ 9066 / ASTM A193 |
| Material | Alloy Steel (AISI 4140) |
| Diameter | 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1-1/8″ … up to 4″ |
| Length | Custom lengths based on ASME B16.5 flange charts |
| Hardness | HRC 35 Max (B7), HRC 22 Max (B7M) |
| Finish | Black Oxide, Zinc Plated (Yellow/White), Hot Dip Galvanized, PTFE/Xylan |
| Matching Nut | ASTM A194 Grade 2H Heavy Hex Nuts |
| Standard | ASTM A193, ASME B18.31.2 |
Applications
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Oil & Gas: Securing pipe flanges in refineries and petrochemical plants.
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Power Generation: High-pressure steam lines and turbines.
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Water Treatment: Valve assembly and large diameter pumping systems.
Get a Quote
We hold a large stock of B7 raw materials to ensure fast delivery for urgent project shutdowns.
To request a quote for Stud Bolts (complete with 2H nuts), please Contact Us with your size list.
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