S-91251A575 5/16"-18 x 1/4" 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 under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tighter tolerances for secure fastening and vibration resistance in critical assemblies.
- High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threads enable quick installation and superior grip in various materials, improving assembly efficiency.
- Hex socket drive design allows for high torque application and easy access in confined spaces, enhancing installation versatility.
- Full threading along the 1/4" length ensures consistent clamping force and flexibility in adjustment applications.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these black-oxide alloy steel socket head cap screws address common challenges in machinery, automotive, and equipment manufacturing. The 5/16"-18 UNC coarse thread with Class 3A fit provides superior resistance to loosening under vibration, while the 170,000 psi tensile strength ensures structural integrity in high-load scenarios. The black-oxide surface treatment significantly enhances corrosion resistance, making these fasteners ideal for environments exposed to moisture, chemicals, or temperature variations. Their hex drive socket head design facilitates secure installation in tight spaces, reducing assembly time and improving maintenance accessibility for industrial fastening systems requiring precision and durability.
Specification Summary & Compliance
This socket head cap screw features precise Class 3A thread fit with 5/16"-18 UNC coarse threads and right-hand thread direction. Manufacturing complies with ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting environmental and safety standards for industrial use worldwide.
