S-91251A968 7/8"-9 x 8 1/2" 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 for reliable performance in high-stress and heavy-duty applications.
- Superior corrosion resistance provided by the black-oxide finish, extending service life in harsh industrial environments.
- High hardness rating of Rockwell C37 ensures excellent wear resistance and durability under repeated use.
- Precise Class 3A thread fit for secure, vibration-resistant fastening and easy assembly.
- Convenient 3/4" hex drive allows for high-torque installation and removal with standard tools.
- Partially threaded design offers optimal grip and clamping force where full threading isn't required.
- Compliance with ASTM A574 guarantees consistent quality and performance for engineering applications.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical industrial challenges, such as vibration loosening and material fatigue. The 7/8"-9 coarse UNRC thread ensures quick assembly and robust holding power in heavy machinery, construction equipment, and automotive systems. Its high tensile strength and Rockwell C37 hardness prevent stripping and deformation under extreme loads, while the black-oxide surface treatment provides a durable barrier against rust and corrosion. Ideal for applications requiring reliable, long-lasting fasteners that maintain integrity in demanding environments, this screw delivers consistent performance and reduces maintenance needs.
Specification Summary & Compliance
This socket head cap screw features a 7/8"-9 coarse thread with Class 3A thread fit for precise engagement and a partially threaded rod design. It complies with ASTM A574 specifications for material and manufacturing standards, ensuring dimensional accuracy and reliability. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
