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Xiamen B7 2H Bolt and Nut
QS Fastener: Xiamen B7 2H Bolt and Nut
Name: Xiamen B7 2H Bolt and Nut
Size: 9/16 Inch
Material for Stud Bolt: ASTM A193 B7
Material for Stud Nut: ASTM A194 2H
Thread: 12 UNC
Total Length: 3.5 Inch
Standard for Bolt: ASME B18.31.2
Standard for Nut: ASME B18.2.2
Application: Design for Flanges as per ASME B16.5
Size: 9/16 Inch
Material for Stud Bolt: ASTM A193 B7
Material for Stud Nut: ASTM A194 2H
Thread: 12 UNC
Total Length: 3.5 Inch
Standard for Bolt: ASME B18.31.2
Standard for Nut: ASME B18.2.2
Application: Design for Flanges as per ASME B16.5
Quantity
The B7 2H Bolt and Nut assembly is a high-strength, temperature-resistant fastening system engineered for critical bolted connections in pressure vessels, piping systems, and flanged joints. This matched set comprises a stud bolt manufactured from ASTM A193 Grade B7 alloy steel (chrome-molybdenum) and a heavy hex nut produced from ASTM A194 Grade 2H carbon steel – a combination that delivers proven reliability in high-pressure, high-temperature environments. Designed with a 12 UNC thread(unified coarse pitch) and a nominal size of 9/16 Inch, this fastener pair offers excellent load distribution and vibration resistance, making it the preferred choice for refinery, petrochemical, power generation, and oil & gas infrastructure projects.
Dimensions & Standards Compliance
- Bolt Standard: ASME B18.31.2 (Continuous-Thread Stud Bolts)
- Nut Standard: ASME B18.2.2 (Heavy Hex Nuts)
- Total Length: 3.5 Inch (stud bolt overall length)
- Thread Specification: 12 UNC – Class 2A external / 2B internal fitment ensures consistent torque-tension relationships during installation.
- Bolt Standard: ASME B18.31.2 (Continuous-Thread Stud Bolts)
- Nut Standard: ASME B18.2.2 (Heavy Hex Nuts)
- Total Length: 3.5 Inch (stud bolt overall length)
- Thread Specification: 12 UNC – Class 2A external / 2B internal fitment ensures consistent torque-tension relationships during installation.
Each component is dimensionally inspected to meet ASME B16.5 flange bolt-hole patterns, ensuring seamless compatibility with raised-face and ring-joint flange connections from NPS ½ through NPS 24. The 9/16"diameter is ideally suited for Class 150, 300, and 600 flange ratings, providing a balanced cross-section for gasket compression and joint integrity.
Application Scenarios
This B7 2H Bolt and Nut set is universally specified for:
- Flange-to-flange connections in accordance with ASME B16.5 (pipe flanges and flanged fittings).
- Valve and pump mounting in high-temperature steam lines (up to 1,000°F under creep-rupture conditions).
- Heat exchanger channel covers, pressure vessel manways, and boiler external piping.
- Offshore platforms and onshore compressor stations where cyclic loading and corrosive atmospheres are present (supplemental coating recommended for severe marine exposure).
This B7 2H Bolt and Nut set is universally specified for:
- Flange-to-flange connections in accordance with ASME B16.5 (pipe flanges and flanged fittings).
- Valve and pump mounting in high-temperature steam lines (up to 1,000°F under creep-rupture conditions).
- Heat exchanger channel covers, pressure vessel manways, and boiler external piping.
- Offshore platforms and onshore compressor stations where cyclic loading and corrosive atmospheres are present (supplemental coating recommended for severe marine exposure).
Performance Advantages
The A193 B7 stud bolt offers a minimum tensile strength of 125 ksi and yield strength of 105 ksi, while the matching A194 2H nut provides through-hardened bearing surfaces that resist galling and thread stripping under repeated make-and-break cycles. The 12 UNC thread pitch facilitates rapid assembly with standard pneumatic or manual torque tools, and the 3.5-inch overall length accommodates standard flange thicknesses with sufficient thread engagement beyond the nut face – a critical safety factor for leak-free service.
The A193 B7 stud bolt offers a minimum tensile strength of 125 ksi and yield strength of 105 ksi, while the matching A194 2H nut provides through-hardened bearing surfaces that resist galling and thread stripping under repeated make-and-break cycles. The 12 UNC thread pitch facilitates rapid assembly with standard pneumatic or manual torque tools, and the 3.5-inch overall length accommodates standard flange thicknesses with sufficient thread engagement beyond the nut face – a critical safety factor for leak-free service.
Quality Assurance
Every lot is traceable to mill test reports (MTRs) and positively identified with material grade markings. Hardness tests, dimensional gauging, and magnetic particle inspection (optional) ensure zero defects. Supplied with a light rust-preventive oil film, these fasteners are ready for immediate installation in new construction or maintenance turnarounds. For critical bolting applications demanding integrity, safety, and code compliance, the Xiamen B7 2H Bolt and Nut set delivers field-proven performance – backed by full ASME conformance and global supply-chain reliability.
Every lot is traceable to mill test reports (MTRs) and positively identified with material grade markings. Hardness tests, dimensional gauging, and magnetic particle inspection (optional) ensure zero defects. Supplied with a light rust-preventive oil film, these fasteners are ready for immediate installation in new construction or maintenance turnarounds. For critical bolting applications demanding integrity, safety, and code compliance, the Xiamen B7 2H Bolt and Nut set delivers field-proven performance – backed by full ASME conformance and global supply-chain reliability.
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