S-94705A812 1 1/8"-8 x 3 1/2" 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 corrosion and wear resistance thanks to ASTM Grade B7 steel construction and Rockwell C35 hardness
- Precise and secure fastening ensured by UN fine threading and Class 2A fit for minimal vibration loosening
- Full-length threading provides maximum grip and adjustability across the entire 3 1/2" length
- Easy installation and removal with standard 1 13/16" external hex head compatible with common tools
- Industry-standard compliance meeting ASTM A193 specifications for guaranteed quality and interoperability
- Heavy-duty construction designed for demanding industrial environments requiring inch-system components
Professional Applications & Engineering Value
These high-strength hex head screws deliver critical reliability in demanding applications where failure is not an option. The ASTM Grade B7 steel composition provides exceptional resistance to creep and relaxation under sustained loads, making them ideal for pressure vessels, structural connections, and heavy machinery assemblies. The UN fine threading (1 1/8"-8) offers superior resistance to vibrational loosening compared to coarse threads, while the Class 2A fit ensures consistent engagement without binding. With full threading along the entire 3 1/2" length, these fasteners provide maximum clamping force distribution and flexibility in assembly depth. The external hex drive design allows for high torque application with standard tools, ensuring secure installations in confined spaces common in industrial settings.
Specification Summary & Compliance
Manufactured to ASTM A193 specifications with Class 2A thread fit tolerance for precision engagement. Features UN fine threading (1 1/8"-8) with right-hand direction and fully threaded 3 1/2" length. The ASTM Grade B7 steel construction delivers 125,000 PSI tensile strength and Rockwell C35 hardness. Complies with industry standards for heavy-duty inch system fasteners used in critical engineering applications.
