S-91253A155 6-32 x 1 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 in demanding applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• Precise Class 3A thread fit provides secure, vibration-resistant connections, minimizing loosening over time.
• 82° countersink angle allows for a flush, professional finish, ideal for applications requiring a smooth surface.
• Hex drive design (5/64") offers high torque capability and easy installation with standard tools, speeding up assembly processes.
• Partially threaded shank enables better clamping force control, perfect for materials that require precise joint compression.
• Compliance with ASTM F835, RoHS 3, and REACH ensures environmental safety and meets rigorous industry standards for quality and reliability.

Professional Applications & Engineering Value

These 6-32 UNC flat head screws are engineered to address common industrial challenges, such as vibration-induced loosening and corrosion in demanding environments. The black-oxide alloy steel construction, combined with a Rockwell C39 hardness, provides excellent durability and wear resistance, making them ideal for machinery, automotive assemblies, and electronic enclosures. The coarse thread spacing and Class 3A thread fit ensure quick, secure fastening in metals and plastics, reducing installation time while maintaining joint integrity. Their partially threaded design allows for optimal grip without over-compression, solving alignment issues in precision applications. These screws deliver consistent performance in heavy-duty fastening scenarios, backed by compliance with key standards for long-term reliability.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including Class 3A thread fit per UNC standards and an 82° countersink angle for consistent seating. Manufacturing follows ASTM F835 specifications, ensuring high-quality alloy steel with a tensile strength of 130,000 psi. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental safety, free from restricted substances, supporting sustainable industrial practices.