S-94705A502 7/8"-9 x 3" ASTM A193 Steel Heavy Hex Head Screws for High-Pressure Applications
Steel Heavy Hex Head Screws for High-Pressure Applications
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional load-bearing capacity with 125,000 PSI tensile strength for reliable performance in high-stress applications
- Superior hardness and durability thanks to Rockwell C35 rating, resisting deformation under heavy loads
- Optimized thread engagement with Class 2A fit UNC coarse threads ensuring secure fastening and vibration resistance
- Enhanced installation efficiency through external hex drive design providing maximum torque transfer
- Reduced stress concentration with partially threaded design, minimizing failure risk in critical connection points
- Proven material reliability using ASTM Grade B7 steel, specifically engineered for high-temperature and high-pressure service
- Industry-standard compatibility with 7/8"-9 UNC coarse threading for easy replacement and system integration
Professional Applications & Engineering Value
This ASTM Grade B7 hex head screw delivers critical performance where ordinary fasteners fail. The high-strength steel construction combined with Rockwell C35 hardness provides exceptional resistance to creep and relaxation in elevated temperature applications common in petrochemical, power generation, and heavy machinery industries. The partially threaded design concentrates strength where needed most, while the coarse UNC threading with Class 2A fit ensures rapid installation and reliable clamping force maintenance despite vibration and thermal cycling. Engineered to meet ASTM A193 specifications, this external hex drive fastener offers predictable performance in pressure vessel flanges, valve assemblies, and structural connections where failure is not an option.
Specification Summary & Compliance
This 7/8"-9 UNC hex head screw features precise Class 2A thread fit tolerances with coarse thread spacing and right-hand thread direction. Manufactured to meet ASTM A193 specifications for high-temperature service, the fastener complies with industry standards for dimensional accuracy and mechanical properties. The inch system measurements include 3" overall length, 1" grip length, and 1-7/16" head width for consistent performance across industrial applications.
