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Jiangsu ASTM A193 B7 Bolt
QS Fastener: Jiangsu ASTM A193 B7 Bolt
Product: Jiangsu ASTM A193 B7 Bolt
Surface Treatment: Electric Zinc Coating
Standard: API 20E BSL 2
Length: 225 mm
Size: 1-1/8 Inch
Material: ASTM A193 B7
Surface Treatment: Electric Zinc Coating
Standard: API 20E BSL 2
Length: 225 mm
Size: 1-1/8 Inch
Material: ASTM A193 B7
Quantity
The ASTM A193 B7 Bolt represents a benchmark in high-strength fastening technology, engineered for demanding industrial applications where reliability and performance are non-negotiable. Manufactured in Jiangsu, this bolt combines premium materials with precision engineering to deliver exceptional service in critical environments.
Material & Mechanical Properties
This bolt is manufactured from chromium-molybdenum alloy steel (AISI 4140/4142), quenched and tempered to achieve its characteristic high-strength properties . The ASTM A193 B7 specification mandates a minimum tensile strength of 125 ksi (862 MPa) and a minimum yield strength of 105 ksi (724 MPa) for diameters up to 2-1/2 inches . With a hardness range of 235-331 HB, this B7 bolt provides the mechanical robustness required for high-pressure and high-temperature service conditions up to 450°C (840°F) .
This bolt is manufactured from chromium-molybdenum alloy steel (AISI 4140/4142), quenched and tempered to achieve its characteristic high-strength properties . The ASTM A193 B7 specification mandates a minimum tensile strength of 125 ksi (862 MPa) and a minimum yield strength of 105 ksi (724 MPa) for diameters up to 2-1/2 inches . With a hardness range of 235-331 HB, this B7 bolt provides the mechanical robustness required for high-pressure and high-temperature service conditions up to 450°C (840°F) .
The API 20E BSL 2 certification signifies compliance with stringent technical, quality, and qualification requirements for bolting used in the petroleum and natural gas industries . BSL-2 represents an intermediate level of quality assurance, with rigorous material traceability, manufacturing process control, and documentation standards that exceed general commercial requirements .
Surface Treatment – Electric Zinc Coating
The electric zinc coating provides dual-action corrosion protection: a barrier layer that isolates the steel from moisture and contaminants, and a sacrificial layer that corrodes preferentially to protect the base material . This coating process, performed in accordance with ISO 4042 standards for electroplated fasteners, enhances corrosion resistance while maintaining critical thread tolerances . Post-plating heat treatment is applied to mitigate the risk of hydrogen embrittlement, ensuring the bolt maintains its full mechanical integrity .
The electric zinc coating provides dual-action corrosion protection: a barrier layer that isolates the steel from moisture and contaminants, and a sacrificial layer that corrodes preferentially to protect the base material . This coating process, performed in accordance with ISO 4042 standards for electroplated fasteners, enhances corrosion resistance while maintaining critical thread tolerances . Post-plating heat treatment is applied to mitigate the risk of hydrogen embrittlement, ensuring the bolt maintains its full mechanical integrity .
Applications
The ASTM A193 B7 Bolt is the industry standard for bolting carbon steel flanges and pressure-containing equipment. Key application areas include:
The ASTM A193 B7 Bolt is the industry standard for bolting carbon steel flanges and pressure-containing equipment. Key application areas include:
- Oil & Gas Industry: Wellhead equipment, pipeline flanges, and offshore drilling components
- Petrochemical Plants: High-temperature/high-pressure process piping systems
- Power Generation: Steam systems and turbine connections
- Pressure Vessels & Valves: Critical bolting for pressure-retaining joints
- General Industrial: Heavy machinery, structural connections, and high-stress fastening applications
- Petrochemical Plants: High-temperature/high-pressure process piping systems
- Power Generation: Steam systems and turbine connections
- Pressure Vessels & Valves: Critical bolting for pressure-retaining joints
- General Industrial: Heavy machinery, structural connections, and high-stress fastening applications
For optimal joint performance, this bolt should be paired with ASTM A194 Grade 2H heavy hex nuts, ensuring matched strength and load-bearing capacity .
Why Choose This Product ?
This Jiangsu-manufactured ASTM A193 B7 Bolt delivers the perfect balance of strength, durability, and corrosion protection. The API 20E BSL 2 certification provides independent assurance of quality and traceability, making it the preferred choice for engineers and procurement professionals seeking reliable bolting solutions for critical service applications.
This Jiangsu-manufactured ASTM A193 B7 Bolt delivers the perfect balance of strength, durability, and corrosion protection. The API 20E BSL 2 certification provides independent assurance of quality and traceability, making it the preferred choice for engineers and procurement professionals seeking reliable bolting solutions for critical service applications.
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