S-91253A056 1-72 x 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Precise Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in critical assemblies.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance and a durable, non-reflective surface suitable for industrial environments.
• Hex drive design allows for high-torque installation with standard tools, improving assembly efficiency and reducing strip-out risks.
• 82° countersink angle and flat head profile enable a flush fit in tapered seats, creating smooth, aerodynamic surfaces and preventing snagging.
• Fully threaded shank maximizes grip length and load distribution, ensuring secure fastening across the entire engagement area.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees material consistency, environmental safety, and adherence to international industrial standards.

Professional Applications & Engineering Value

These 1-72 UNF flat head screws are engineered for precision applications where space constraints and high strength are critical. The Black-Oxide Alloy Steel construction provides excellent durability and resistance to wear, making them ideal for electronics, aerospace, and machinery assemblies. The fine UNF thread and Class 3A fit ensure tight tolerances and reliable performance in vibration-prone environments, reducing maintenance needs. The hex drive facilitates secure installation in confined areas, while the 82° countersink allows for a seamless finish, preventing interference in precision equipment. These screws address common industrial challenges such as thread stripping, corrosion, and compliance requirements, offering a robust solution for high-performance fastening.

Specification Summary & Compliance

This screw features a 1-72 UNF fine thread with Class 3A thread fit for high precision and strength. It is manufactured from Alloy Steel with a Black-Oxide surface treatment, ensuring durability and corrosion resistance. The product meets ASTM F835 specifications for consistent quality and performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and adherence to environmental standards for industrial use.