S-91253A375 1/2"-20 x 1 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat 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 130,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Corrosion-resistant black-oxide finish on alloy steel enhances durability and longevity in harsh industrial environments.
- Precision Class 3A thread fit provides superior engagement and vibration resistance for secure, long-lasting assemblies.
- Fully threaded UNF fine spacing offers excellent holding power and minimizes loosening under dynamic loads.
- Hex drive (5/16") design allows for easy installation and high torque application with standard tools.
- 82° countersink angle and flat head profile enable a flush finish, improving aesthetics and safety in assembled products.
- Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interoperability in regulated industries.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Flat Head Screw is engineered to address critical challenges in industrial assembly, where vibration resistance, corrosion protection, and high tensile strength are paramount. The UNF fine threading and Class 3A fit ensure precise alignment and secure fastening in machinery, automotive components, and heavy equipment, reducing maintenance needs and downtime. The fully threaded design maximizes grip length, while the 82° countersink allows for seamless integration into surfaces, preventing snagging and enhancing operational safety. Ideal for applications requiring reliable performance under stress, these screws deliver consistent results in demanding environments.
Specification Summary & Compliance
This screw features a 1/2"-20 UNF thread with Class 3A precision fit and fine thread spacing, ensuring tight tolerances per industry standards. Manufactured to meet ASME B18.3 and ASTM F835 specifications, it also complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally conscious and safe industrial practices.
