S-91864A055 5/8"-18 x 3/4" 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 industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish prolongs service life in harsh environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tight tolerances for secure, vibration-resistant assemblies in machinery and equipment.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Standard hex socket drive allows for easy installation with common tools, speeding up assembly processes.
- Fine UNF threads deliver enhanced clamping force and better adjustment precision compared to coarse threads.
- Compliance with ASTM A574, RoHS 3, and REACH ensures 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-duty applications, such as machinery assembly, automotive systems, and construction equipment. The fine UNF threads and Class 3A fit provide superior resistance to loosening under vibration, a common issue in dynamic environments. With a tensile strength of 170,000 psi and Rockwell C37 hardness, it withstands extreme loads and wear, reducing downtime and replacement costs. The black-oxide surface treatment enhances corrosion resistance, making it ideal for outdoor or humid conditions. Its fully threaded design and 1/2" hex drive facilitate quick, secure installations, optimizing efficiency in industrial maintenance and manufacturing operations.
Specification Summary & Compliance
This socket head cap screw features a 5/8"-18 UNF fine thread with Class 3A tolerance for precise fit, and is manufactured to ASTM A574 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and material consistency. The inch system measurements include a 3/4" length and 15/16" head diameter, supporting reliable performance in regulated industrial applications.
