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Yancheng Hexagon Socket Head Bolt
QS Fastener: Yancheng Hexagon Socket Head Bolt
Product: Yancheng Hexagon Socket Head Bolt
Thread: 9 UNC
Standard: ASME B18.3, GB 70.1
Dimension: 7/8 IN
Length: 90 mm
Material: ASTM A193 B16
Coating: Hot Dip Galvanized (HDG)
Thread: 9 UNC
Standard: ASME B18.3, GB 70.1
Dimension: 7/8 IN
Length: 90 mm
Material: ASTM A193 B16
Coating: Hot Dip Galvanized (HDG)
Quantity
The Hexagon Socket Head Bolt is a high-performance fastening solution precision-engineered for demanding industrial applications requiring superior strength, temperature resistance, and long-term reliability. Manufactured from premium ASTM A193 B16 alloy steel and finished with Hot Dip Galvanized coating, this bolt delivers exceptional mechanical properties and corrosion protection for mission-critical bolted connections.
Material Excellence – ASTM A193 B16
ASTM A193 Grade B16 is a chromium-molybdenum-vanadium (Cr-Mo-V) alloy steel specifically formulated for elevated temperature service . Through quenching and tempering heat treatment, this material achieves a minimum tensile strength of 860 MPa (125 ksi) and a yield strength of 725 MPa (105 ksi) . The vanadium addition and higher tempering temperature (635°C minimum) provide significantly superior stress relaxation resistance compared to standard Grade B7, making B16 the preferred choice for continuous operating temperatures from 400°C up to 480°C (900°F) . This exceptional high-temperature stability ensures maintained bolt preload and joint integrity over extended service life.
ASTM A193 Grade B16 is a chromium-molybdenum-vanadium (Cr-Mo-V) alloy steel specifically formulated for elevated temperature service . Through quenching and tempering heat treatment, this material achieves a minimum tensile strength of 860 MPa (125 ksi) and a yield strength of 725 MPa (105 ksi) . The vanadium addition and higher tempering temperature (635°C minimum) provide significantly superior stress relaxation resistance compared to standard Grade B7, making B16 the preferred choice for continuous operating temperatures from 400°C up to 480°C (900°F) . This exceptional high-temperature stability ensures maintained bolt preload and joint integrity over extended service life.
Dimensional Specifications
The bolt features a 7/8 inch nominal diameter with 9 UNC thread series, providing optimal strength and stability for heavy-duty bolted connections. The 90mm length accommodates diverse design requirements across various industrial applications. Thread stress area for 7/8-9 UNC is 0.462 square inches, supporting substantial load-bearing capacity .
The bolt features a 7/8 inch nominal diameter with 9 UNC thread series, providing optimal strength and stability for heavy-duty bolted connections. The 90mm length accommodates diverse design requirements across various industrial applications. Thread stress area for 7/8-9 UNC is 0.462 square inches, supporting substantial load-bearing capacity .
Design Standards and Quality Assurance
Manufactured in full compliance with ASME B18.3 and GB 70.1 standards, this Hexagon Socket Head Bolt guarantees dimensional accuracy, consistent quality, and reliable performance. The hexagon socket head design enables convenient installation with standard hex keys, providing precise torque control during tightening.
Manufactured in full compliance with ASME B18.3 and GB 70.1 standards, this Hexagon Socket Head Bolt guarantees dimensional accuracy, consistent quality, and reliable performance. The hexagon socket head design enables convenient installation with standard hex keys, providing precise torque control during tightening.
Advanced Corrosion Protection
The Hot Dip Galvanized (HDG) coating provides robust corrosion resistance, significantly extending bolt lifespan in harsh environments. While HDG offers excellent protection against atmospheric corrosion, it should be noted that high-strength galvanized fasteners require careful handling to mitigate hydrogen embrittlement risks associated with the galvanizing process .
The Hot Dip Galvanized (HDG) coating provides robust corrosion resistance, significantly extending bolt lifespan in harsh environments. While HDG offers excellent protection against atmospheric corrosion, it should be noted that high-strength galvanized fasteners require careful handling to mitigate hydrogen embrittlement risks associated with the galvanizing process .
Application Scenarios
This Hexagon Socket Head Bolt is ideally suited for:
- Power Generation: Steam turbine and gas turbine bolting, boiler connections, and heat exchanger assemblies operating at elevated temperatures
- Petrochemical Industry: Pressure vessels, valves, flanges, and high-temperature/high-pressure piping systems where B7 bolts are insufficient
- Refinery Equipment: Main steam lines, hot reheat piping, and heater piping with Cr-Mo alloy components
- Industrial Furnaces: High-temperature furnace equipment and kiln fastening applications
- Nuclear Power: Nuclear power plant components requiring high-temperature integrity and reliability
This Hexagon Socket Head Bolt is ideally suited for:
- Power Generation: Steam turbine and gas turbine bolting, boiler connections, and heat exchanger assemblies operating at elevated temperatures
- Petrochemical Industry: Pressure vessels, valves, flanges, and high-temperature/high-pressure piping systems where B7 bolts are insufficient
- Refinery Equipment: Main steam lines, hot reheat piping, and heater piping with Cr-Mo alloy components
- Industrial Furnaces: High-temperature furnace equipment and kiln fastening applications
- Nuclear Power: Nuclear power plant components requiring high-temperature integrity and reliability
Performance Advantages
The combination of ASTM A193 B16 material, precision UNC threading, and HDG coating delivers a fastening solution that excels in elevated temperature environments while maintaining corrosion resistance. The bolt maintains structural integrity where standard B7 fasteners would experience significant stress relaxation and preload loss . This makes it the preferred choice for safety-critical industrial applications demanding long-term, reliable performance under extreme service conditions.
The combination of ASTM A193 B16 material, precision UNC threading, and HDG coating delivers a fastening solution that excels in elevated temperature environments while maintaining corrosion resistance. The bolt maintains structural integrity where standard B7 fasteners would experience significant stress relaxation and preload loss . This makes it the preferred choice for safety-critical industrial applications demanding long-term, reliable performance under extreme service conditions.
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