S-91251A898 7/8"-9 x 7" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket 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 tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish prolongs service life in harsh industrial environments.
- Precise Class 3A thread fit provides excellent engagement and vibration resistance, minimizing loosening over time.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Heavy-duty hex drive design with 3/4" drive size allows for high torque application and easy installation in confined spaces.
- Partially threaded shank enables precise clamping force distribution and secure fastening in structural assemblies.
- Compliance with ASTM A574 and environmental regulations ensures material quality and safe use across global markets.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this black-oxide alloy steel socket head cap screw delivers exceptional reliability where failure is not an option. The 7/8"-9 coarse thread and Class 3A thread fit provide superior vibration resistance in heavy machinery, construction equipment, and automotive assemblies. The partially threaded design ensures optimal stress distribution while the hex socket drive enables high-torque installation in confined spaces. With 170,000 psi tensile strength and Rockwell C37 hardness, this fastener maintains integrity under extreme loads, making it ideal for critical connections in manufacturing, aerospace, and energy sectors where durability and precision are paramount.
Specification Summary & Compliance
This socket head cap screw features 7/8"-9 UNC coarse threads with Class 3A thread fit for precision engagement. The partially threaded design provides 2 1/4" minimum thread length on a 7" overall length. Manufactured to ASTM A574 specification, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring both performance reliability and regulatory compliance for industrial use.
