S-91263A211 7/16"-14 x 1 1/4" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Zinc-plated alloy steel construction provides superior corrosion resistance, extending service life in harsh industrial environments.
• Class 3A thread fit offers tighter tolerances for secure, vibration-resistant assemblies with minimal backlash.
• Fully threaded UNC coarse spacing enables faster installation and improved grip in a wide range of materials.
• 82° countersink angle with standard flat head profile ensures a flush, professional finish while distributing clamp load effectively.
• Hex drive design (1/4") allows for high-torque application with common tools, speeding up assembly and disassembly.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety regulations.

Professional Applications & Engineering Value

These zinc-plated alloy steel flat head hex screws are engineered to address critical challenges in heavy-duty industrial applications, such as machinery assembly, structural frameworks, and automotive components. The UNC coarse thread spacing and Class 3A thread fit provide superior resistance to loosening under vibration, a common issue in dynamic environments. The fully threaded design ensures consistent clamping force along the entire length, while the 82° countersink angle allows for seamless integration into countersunk holes, preventing protrusions that could interfere with moving parts. With a Rockwell C32 hardness and robust alloy steel material, these screws withstand repetitive loads and harsh conditions, reducing maintenance needs and enhancing operational reliability in sectors like manufacturing, construction, and equipment repair.

Specification Summary & Compliance

This product features precise Class 3A thread fit per UNC standards, with dimensions including a 7/16"-14 thread size, 1-1/4" length, and 1/4" hex drive. It is manufactured in compliance with ASME B18.3 specifications for flat head screws, ensuring dimensional accuracy and performance consistency. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in regulated industries without hazardous substances.