S-91253A202 8-32 x 1 3/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – 130,000 psi rating ensures reliable performance under high-stress conditions, reducing failure risks in demanding applications.
• Precision Class 3A Thread Fit – Delivers superior thread engagement and vibration resistance, minimizing loosening in dynamic environments.
• Corrosion-Resistant Black-Oxide Finish – Extends service life by protecting the alloy steel from oxidation and wear in harsh industrial settings.
• Flush-Mount 82° Countersink Design – Allows for seamless surface integration, eliminating protrusions and improving aesthetic and safety in assembled products.
• Hex Drive Compatibility – 3/32" hex drive enables secure, high-torque installation with standard tools, speeding up assembly processes.
• Partially Threaded Configuration – Provides optimal grip and clamping force control, ideal for materials requiring precise fastening without over-compression.
• High Hardness Rating – Rockwell C39 hardness ensures durability and resistance to deformation, maintaining fastener integrity over repeated use.

Professional Applications & Engineering Value

Engineered for industrial and mechanical assemblies, these 8-32 UNC flat head screws address common challenges like vibration-induced loosening and corrosion. The Black-Oxide Alloy Steel construction, combined with a coarse thread spacing and Class 3A thread fit, ensures quick installation and long-term reliability in machinery, automotive, and electronic enclosures. The partially threaded design and 82° countersink angle facilitate flush mounting, reducing snag hazards and improving airflow in compact designs. Ideal for right-hand thread applications requiring high tensile strength and compliance with rigorous industry standards, these screws minimize maintenance needs and enhance product lifespan.

Specification Summary & Compliance

This screw adheres to precise dimensional tolerances, including Class 3A thread fit and UNC thread standards, ensuring consistent performance. It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and suitability for global industrial markets.