S-91251A886 7/8"-9 x 3 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 ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides corrosion resistance and a durable finish, extending service life in demanding environments.
- Class 3A thread fit offers precise, tight tolerances for secure fastening and vibration resistance in critical assemblies.
- 3/4" hex drive with standard socket head allows for high torque application and easy installation in confined spaces.
- Partially threaded design enables accurate clamping force control and secure grip on components.
- UNRC coarse threads facilitate quick assembly and disassembly, saving time in maintenance and production.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global industrial use.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening and corrosion in heavy machinery, automotive, and construction equipment. The alloy steel construction, combined with a Rockwell C37 hardness, provides superior durability and resistance to wear, making it ideal for high-load applications. The UNRC coarse thread design ensures reliable engagement in materials prone to debris, while the 3/4" hex drive allows for efficient torque transmission without stripping. By meeting ASTM A574 specifications, it guarantees consistent performance in critical assemblies, reducing downtime and maintenance costs.
Specification Summary & Compliance
This socket head cap screw features a 7/8"-9 thread size with Class 3A thread fit for precise dimensional accuracy per UNRC standards. It is manufactured in accordance with ASTM A574 for high-strength alloy steel fasteners and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for industrial use worldwide.
