S-94705A779 7/8"-9 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 industrial applications, reducing failure risks.
- High durability with Rockwell C35 hardness provides excellent resistance to wear and deformation under extreme conditions.
- ASTM A193 Grade B7 material offers superior corrosion resistance and mechanical properties for long-term reliability.
- Class 2A thread fit with UNC coarse threading enables quick and secure assembly, minimizing cross-threading issues.
- Partially threaded design with 2" grip length ensures precise clamping force distribution and vibration resistance.
- External hex drive and hex head allow for easy installation and removal with standard tools, improving maintenance efficiency.
- Right-hand thread direction and inch system measurements ensure compatibility with existing North American industrial equipment.
Professional Applications & Engineering Value
This 7/8"-9 UNC Grade B7 steel hex head screw is engineered to address critical challenges in heavy-duty industrial settings, such as pressure vessels, valve systems, and structural assemblies. The ASTM A193-compliant steel and Rockwell C35 hardness provide exceptional resistance to thermal cycling and mechanical stress, preventing loosening under vibration. The coarse UNC thread and Class 2A fit ensure rapid, secure fastening in high-torque applications, while the partial threading optimizes load distribution across the 2" grip length. Ideal for industries requiring 125,000 PSI tensile strength, this fastener delivers reliable performance in extreme temperature and pressure environments, reducing downtime and maintenance costs.
Specification Summary & Compliance
This fastener adheres to ASTM A193 specifications for high-temperature service, with thread fit Class 2A ensuring precise dimensional accuracy. The UNC coarse thread (7/8"-9) follows standardized inch measurements, while the partially threaded design and external hex drive meet common industrial assembly requirements. Compliant with RoHS and REACH for material safety, it is suitable for applications demanding 125,000 PSI tensile strength and Rockwell C35 hardness, providing consistent performance in regulated environments.
