S-91255A261 10-32 x 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 demanding applications, reducing the risk of fastener failure.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in high-stress environments.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance and a durable, non-reflective surface for extended service life.
• Rockwell C39 hardness delivers excellent wear resistance, maintaining thread integrity through repeated assembly and disassembly.
• Fully threaded fine UNF design allows for maximum grip length and finer adjustment in precision assemblies.
• 1/8" hex drive with rounded button head enables easy installation in confined spaces while providing a low-profile, finished appearance.
• Compliance with ASME, ASTM, RoHS, and REACH guarantees material safety and interchangeability in regulated industrial applications.

Professional Applications & Engineering Value

These black-oxide alloy steel rounded head screws with 10-32 UNF Class 3A threads are engineered to address critical challenges in precision machinery, electronics, and automotive assemblies. The fine thread spacing and fully threaded design ensure maximum clamping force and resistance to vibrational loosening, a common failure point in dynamic environments. The black-oxide surface treatment not only provides corrosion protection but also reduces galling during installation, extending tool life. With a 120,000 psi tensile strength and Rockwell C39 hardness, these screws maintain integrity under high loads and repeated use, making them ideal for applications requiring reliable, high-strength fastening without compromising on dimensional accuracy or regulatory compliance.

Specification Summary & Compliance

This screw features a 10-32 UNF thread with Class 3A fit, ensuring tight tolerances for precision assemblies. It is manufactured to meet ASME B18.3 and ASTM F835 specifications, guaranteeing dimensional consistency and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances for safe use in various industrial sectors.