S-91251A903 7/8"-9 x 10" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
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 extends service life in harsh industrial environments, minimizing maintenance needs.
- High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
- Class 3A thread fit offers precise, tight tolerances for secure fastening and vibration resistance in critical assemblies.
- Partially threaded design allows for controlled clamping force and easier alignment in structural applications.
- 3/4" hex drive enables high-torque installation with standard tools, speeding up assembly processes.
- Compliance with ASTM A574 guarantees consistent quality and material properties for engineering reliability.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as joint loosening under dynamic loads and corrosion in demanding environments. The UNRC coarse thread design facilitates quick assembly and disassembly while providing strong holding power in materials like steel and cast iron. With its partially threaded configuration, it ensures optimal stress distribution, preventing thread stripping in soft substrates. Ideal for heavy machinery, automotive frames, and construction equipment, this fastener combines high tensile strength and corrosion-resistant surface treatment to deliver long-term reliability in applications where safety and durability are paramount.
Specification Summary & Compliance
This socket head cap screw features a Class 3A thread fit for precision and a UNRC coarse thread with 7/8"-9 size. Manufactured to ASTM A574 specifications, it ensures consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious industrial settings without hazardous substances.
