S-91255A528 1/4"-20 x 2 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional durability with 120,000 psi tensile strength and Rockwell C39 hardness for reliable performance in demanding applications
• Superior corrosion resistance through black-oxide coating on alloy steel, extending service life in harsh industrial environments
• Enhanced holding power with fully threaded UNC coarse thread design that provides maximum grip and vibration resistance
• Precise thread engagement with Class 3A fit ensuring consistent, reliable connections in critical assemblies
• Easy installation and removal with 5/32" hex drive design that prevents stripping and allows for high torque application
• Low-profile rounded button head design reduces protrusion while maintaining strong clamping force in space-constrained applications
• Industry compliance assurance meeting ASME B18.3 and ASTM F835 standards for guaranteed quality and performance

Professional Applications & Engineering Value

These black-oxide alloy steel button head screws deliver exceptional engineering value in demanding industrial applications where vibration resistance and corrosion protection are critical. The combination of high-strength alloy steel (120,000 psi tensile strength) with fully threaded UNC coarse threads provides superior clamping force in machinery, heavy equipment, and structural assemblies. The rounded button head profile with hex drive allows for flush mounting in tight spaces while maintaining accessibility for maintenance. These industrial screws are particularly valuable in applications requiring repeated disassembly and reassembly, as the Class 3A thread fit ensures consistent performance through multiple cycles without compromising integrity.

Specification Summary & Compliance

This 1/4"-20 x 2-1/4" button head screw features precision UNC coarse threads with Class 3A fit for optimal thread engagement and dimensional accuracy. Manufactured to meet ASME B18.3 and ASTM F835 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict regulatory adherence.