S-91255A585 5/16"-18 x 1 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish extends service life in harsh environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections, enhancing assembly integrity and reducing loosening over time.
• High hardness (Rockwell C39) provides excellent wear resistance, maintaining thread integrity through repeated installations and removals.
• Coarse UNC threading allows for faster installation and better performance in materials prone to stripping or where quick assembly is critical.
• Hex drive design with 3/16" drive size offers easy installation with standard tools, improving efficiency and reducing labor time.
• Full threading ensures consistent grip along the entire length, providing uniform clamping force and versatility in various material thicknesses.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these Black-Oxide Alloy Steel Rounded Head Screws address common challenges like corrosion, vibration loosening, and high tensile stress. The 5/16-18 UNC coarse thread design is ideal for applications in machinery, automotive assemblies, and structural frameworks where rapid installation and disassembly are essential. The rounded button head provides a low-profile, aesthetically pleasing finish while reducing the risk of snagging. Combined with hex drive functionality, these screws ensure secure fastening in tight spaces, making them perfect for maintenance-heavy sectors. Their robust construction meets rigorous standards, offering long-term reliability in industrial screw applications without compromising on compliance or performance.

Specification Summary & Compliance

This product adheres to Class 3A thread fit for precise dimensional accuracy and is manufactured in accordance with ASME B18.3 and ASTM F835 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for global industrial use.