S-90910A535 1/4"-20 x 2 1/2" ASME B18.3, ASTM F835 Steel Button Head Torx Plus Screws

Key Features & Benefits at a Glance

• Superior torque transmission with Torx Plus IP27 drive, reducing cam-out and tool wear for reliable fastening in high-stress applications
• Exceptional corrosion resistance from zinc-plated alloy steel, ensuring long-term durability in harsh industrial environments
• High tensile strength of 120,000 psi combined with Rockwell C39 hardness for reliable performance under heavy loads
• Precise Class 3A thread fit for secure engagement and vibration resistance in critical assemblies
• Fully threaded design provides consistent clamping force along the entire 2-1/2" length for uniform load distribution
• Low-profile rounded button head offers a finished appearance while minimizing protrusion in confined spaces
• Compliance with multiple industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental responsibility

Professional Applications & Engineering Value

These zinc-plated alloy steel screws with Torx Plus IP27 drive deliver exceptional engineering value in demanding industrial applications. The combination of 120,000 psi tensile strength and Rockwell C39 hardness ensures reliable performance in high-vibration environments where fastener failure is not an option. The fully threaded 1/4-20 UNC coarse thread design provides maximum grip strength and resistance to loosening, making these rounded head screws ideal for machinery assembly, automotive components, and heavy equipment manufacturing. The zinc plating offers superior corrosion protection, extending service life in challenging conditions while the Torx Plus drive system enables higher torque application without stripping, reducing installation time and improving assembly efficiency.

Specification Summary & Compliance

This high-performance fastener features 1/4"-20 UNC coarse threads with Class 3A thread fit for precision engagement and meets ASME B18.3 specifications (ASTM F835). The screw maintains compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries. With dimensions of 2-1/2" length, 0.437" head diameter, and standardized Torx Plus IP27/T27 drive, this fastener delivers consistent performance and reliability in professional applications.