S-91253A111 4-40 x 5/32" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi for reliable performance in demanding applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in various industrial environments.
• Precise Class 3A thread fit ensures tight, secure fastening with minimal play, enhancing assembly integrity.
• Hex drive compatibility allows for easy installation and removal with standard tools, improving workflow efficiency.
• Fully threaded design provides consistent holding power along the entire length, ideal for thin materials.
• 82° countersink angle enables a flush fit in standard countersunk holes, creating a smooth surface finish.
• Compliance with ASTM F835, RoHS 3, and REACH guarantees adherence to strict quality and environmental standards for global use.

Professional Applications & Engineering Value

Engineered for precision and durability, these 4-40 UNC flat head screws in black-oxide alloy steel address common industrial challenges such as vibration loosening and corrosion. The coarse thread and Class 3A fit provide excellent grip in materials like metal and plastic, reducing the need for frequent maintenance. With a hex drive and fully threaded body, they ensure quick, secure installations in tight spaces, making them ideal for machinery, electronics, and automotive assemblies where reliability is critical. The combination of high tensile strength and environmental compliance supports long-term performance in rigorous applications.

Specification Summary & Compliance

This screw adheres to inch system dimensions with a Thread Fit: Class 3A for precise tolerance, Thread Type: UNC coarse spacing, and Right Hand threading. It meets ASTM F835 specifications for mechanical properties and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safety and environmental responsibility.