S-91247A900 7/8"-9 x 8" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 Steel Hex Head Screws
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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 120,000 psi tensile strength, ideal for heavy-duty structural connections.
- Superior corrosion resistance due to zinc plating, extending service life in demanding environments.
- Reliable mechanical performance ensured by Grade 5 classification and Rockwell C25 hardness.
- Efficient installation and removal with an external hex drive and coarse UNC thread for quick assembly.
- Optimized thread engagement with a Class 2A fit, providing consistent clamping force and vibration resistance.
- Versatile partial threading allows for precise adjustment and secure fastening in varied material thicknesses.
- Compliance with industry standards including ASME B18.2.1, ensuring interchangeability and quality assurance.
Professional Applications & Engineering Value
This 7/8"-9 UNC hex head screw is engineered from zinc plated steel to address critical challenges in industrial assembly, such as joint integrity under high stress. The coarse thread design and partial threading enhance grip in soft materials and prevent loosening from vibrations, making it ideal for construction machinery, agricultural equipment, and heavy transport frameworks. Its Grade 5 strength and external hex drive facilitate secure, high-torque installations, reducing downtime and maintenance costs. By meeting ASME B18.2.1 specifications, it ensures compatibility and reliability in heavy-duty screw applications, providing long-term performance in corrosive or high-load environments.
Specification Summary & Compliance
This fastener adheres to precise dimensional standards, including a Class 2A thread fit for consistent tolerance and a UNC thread type with 7/8"-9 coarse spacing. It conforms to ASME B18.2.1 and SAE J429 manufacturing specifications, guaranteeing mechanical properties like tensile strength and hardness. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence for global supply chains.
