S-91255A253 10-24 x 2 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating on alloy steel, extending service life in demanding industrial environments
• Precise thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance in critical assemblies
• Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Optimized partial threading providing superior clamping force control while reducing thread damage risks
• Enhanced installation efficiency with hex drive design allowing high-torque application without cam-out issues
• Compliant with major industry standards including ASME B18.3 and ASTM F835 for guaranteed performance and interchangeability
• Environmental regulation compliance meeting RoHS 3 and REACH standards for sustainable manufacturing practices

Professional Applications & Engineering Value

These 10-24 UNC partially threaded screws with black-oxide alloy steel construction address critical engineering challenges in industrial fastening. The coarse thread spacing and Class 3A thread fit provide exceptional resistance to vibration loosening in machinery, automotive, and heavy equipment applications. The rounded button head design offers a low-profile finish while the hex drive enables secure installation in confined spaces. The partial threading allows precise clamp load distribution, preventing joint failure in structural assemblies. These industrial screws maintain integrity under extreme stress conditions thanks to their 120,000 psi tensile strength, making them ideal for high-vibration environments where fastener reliability is paramount.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread tolerances with UNC coarse thread specifications, these screws ensure precision fit in all applications. Compliance with ASME B18.3 and ASTM F835 standards guarantees consistent quality and dimensional accuracy. The products fully meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming their suitability for global manufacturing requirements. With right-hand threading and standardized 2-1/4" length, these fasteners provide reliable performance across industrial sectors while maintaining strict regulatory compliance.