S-94705A835 1 1/4"-8 x 4 1/4" 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 tensile strength of 125,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure
- ASTM Grade B7 steel construction provides superior durability and resistance to corrosion in demanding industrial environments
- Class 2A thread fit offers precise, consistent engagement for easier assembly while maintaining secure connections
- Partially threaded design with optimized grip length allows for controlled clamping force and vibration resistance
- External hex drive configuration enables high-torque installation with standard tools for efficient maintenance operations
- Rockwell C35 hardness rating ensures excellent wear resistance and long service life under repetitive loading conditions
- UN fine threading provides superior resistance to loosening under vibration compared to coarse thread alternatives
Professional Applications & Engineering Value
This high-strength hex head screw delivers critical engineering solutions for heavy-duty industrial applications where reliability is paramount. The ASTM Grade B7 steel composition, combined with 125,000 PSI tensile strength, addresses common failure points in high-pressure systems, pressure vessels, and structural connections. The partially threaded design with precise 1½" grip length ensures optimal stress distribution, preventing thread stripping while the UN fine thread pattern maintains integrity in vibrating environments. The external hex drive facilitates installation in confined spaces, making these industrial hex bolts ideal for petrochemical, power generation, and heavy machinery applications where ASTM A193 compliance is required for safety-critical assemblies.
Specification Summary & Compliance
This 1¼"-8 hex head screw features Class 2A thread fit tolerances per UN standards with 2¾" thread length and 4¼" total length. Manufactured to meet ASTM A193 specifications for high-temperature service, the fastener complies with industry standards for heavy-duty applications. The right-hand thread direction and fine thread spacing ensure compatibility with standard industrial components while delivering the mechanical properties required for critical bolting applications.
