S-91253A217 8-32 x 3" 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 in high-stress industrial applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in machinery and equipment.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance, prolonging service life in harsh or humid environments.
• Hex drive design with 3/32" drive size allows for easy installation and high torque application, minimizing slippage and tool wear.
• Partially threaded shank with 7/8" minimum thread length enables optimal grip and alignment in materials, improving joint integrity.
• 82° countersink angle and standard flat head profile facilitate flush mounting, reducing protrusion and enhancing aesthetic and safety in finished products.
• Compliance with ASTM F835, RoHS 3, and REACH standards ensures environmental safety and meets rigorous industry regulations for global supply chains.

Professional Applications & Engineering Value

These 8-32 UNC flat head screws are engineered to address common challenges in industrial settings, such as vibration loosening and corrosion-induced degradation. Made from black-oxide alloy steel with a Rockwell C39 hardness, they withstand heavy loads and repetitive stress in machinery assembly, automotive components, and structural frameworks. The coarse UNC thread and Class 3A fit ensure quick, secure fastening in metals and composites, reducing installation time and maintenance needs. Ideal for applications requiring flush mounting with an 82° countersink, these screws provide a sleek finish while maintaining high tensile strength, making them a dependable choice for engineers prioritizing durability and regulatory compliance in demanding environments.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC coarse threading with a thread size of 8-32. It meets manufacturing specifications per ASTM F835 and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it is free from hazardous substances and suitable for international industrial use.