S-91253A763 1/2"-13 x 10" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating on alloy steel, ideal for harsh industrial environments
• Superior load-bearing capacity with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Precise, secure fastening ensured by Class 3A thread fit and UNC coarse threading for reduced cross-threading risks
• Efficient installation and flush mounting with hex drive and 82° countersink angle for seamless surface integration
• Optimized thread engagement through partially threaded design, minimizing material stress in non-critical sections
• Reliable compliance with ASTM F835 standards, RoHS 3, and REACH for safe, regulated use in global markets
• Durable long-term performance in structural assemblies, machinery, and equipment requiring high-strength fasteners

Professional Applications & Engineering Value

This 1/2"-13 UNC flat head screw is engineered to address critical challenges in industrial fastening, where vibration resistance, tensile load capacity, and environmental durability are paramount. The black-oxide alloy steel construction provides a protective barrier against oxidation and wear, extending service life in demanding settings such as heavy machinery, construction frameworks, and automotive assemblies. The coarse UNC thread and Class 3A fit deliver tight tolerances, reducing the risk of loosening under dynamic loads while facilitating quicker installation. With a partially threaded shank, it concentrates clamping force where needed, preventing joint failure. These features make it an optimal choice for engineers seeking high-strength, compliant fasteners that meet rigorous ASTM F835 specifications and regulatory requirements.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including UNC coarse threads with Class 3A thread fit for superior accuracy and a 10" length with partial threading. It conforms to ASTM F835 manufacturing specifications, ensuring consistent performance in mechanical and structural applications. Additionally, the product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, verifying the absence of restricted hazardous substances and supporting environmentally responsible procurement.