S-91251A900 7/8"-9 x 8" 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 hardness rating (Rockwell C37) provides excellent wear resistance and durability for extended service life in demanding environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a clean, professional appearance.
- Large 3/4" hex drive allows for high torque application and secure installation, minimizing stripping and improving assembly efficiency.
- Class 3A thread fit ensures precise, secure mating with nuts and tapped holes, providing vibration resistance and reliable clamping force.
- Partially threaded design concentrates threads where needed, optimizing grip and reducing material usage without compromising strength.
- Coarse UNRC threads enable quicker installation and are less prone to clogging in dirty or debris-filled industrial settings.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered for heavy-duty industrial applications where high tensile strength and durability are critical. The 7/8"-9 coarse UNRC thread and Class 3A fit provide superior engagement in machinery, construction equipment, and automotive assemblies, resisting loosening under vibration. The 3/4" hex drive accommodates high torque tools, ensuring tight fastening in confined spaces typical of industrial screws. Its partially threaded design focuses strength at the clamping point, making it ideal for precision engineering applications requiring reliable, long-lasting fastening solutions.
Specification Summary & Compliance
This socket head cap screw features a 7/8"-9 thread size with Class 3A thread fit and coarse UNRC thread type, ensuring dimensional accuracy and reliable performance. Manufactured to meet ASTM A574 specifications, it guarantees consistent quality and strength. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for industrial use.
