S-91251A308 7/8"-14 x 2 1/2" 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.
- Precision Class 3A thread fit provides superior engagement and vibration resistance, maintaining joint integrity in demanding environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in industrial conditions.
- 3/4" hex drive with standard socket head allows for high-torque installation and easy access in confined spaces.
- Fully threaded design ensures consistent clamping force along the entire 2 1/2" length for uniform load distribution.
- Rockwell C37 hardness provides excellent wear resistance, reducing deformation under repeated use.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chains.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in heavy machinery, automotive, and construction assemblies. Its 7/8"-14 UNRF fine threads and Class 3A fit deliver precise alignment and superior resistance to loosening under dynamic loads, minimizing maintenance downtime. The high tensile strength and Rockwell C37 hardness ensure durability in high-vibration environments, while the black-oxide surface treatment protects against rust and wear. Ideal for applications requiring reliable inch fasteners with consistent performance, this screw supports robust engineering designs by providing secure, long-lasting fastening solutions.
Specification Summary & Compliance
This socket head cap screw features a 7/8"-14 UNRF fine thread with Class 3A tolerance for precise fit. It is manufactured in accordance with ASTM A574 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial use.
