S-99355A222 10-24 x 1 1/4" ASME B18.3 Tamper-Resistant Asymmetrical-Drive Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and long-term reliability
• Exceptional tensile strength rated at 70,000 psi, ensuring secure fastening under high-stress industrial conditions
• Precision thread engagement with UNC coarse spacing and Class 2A fit for quick installation and reduced cross-threading risks
• Enhanced durability from Rockwell B70 hardness, maintaining structural integrity through repeated use and vibration
• Optimized drive performance featuring an asymmetrical U10 drive style for improved torque transfer and reduced cam-out
• Full threading along the 1-1/4" length provides maximum grip and uniform load distribution across the entire fastener
• Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental responsibility

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 18-8 Stainless Steel rounded head screws address critical challenges in machinery assembly, electrical enclosures, and structural frameworks. The UNC coarse thread design facilitates faster installation in tough materials, while the Class 2A thread fit ensures consistent clamping force without galling. With a fully threaded shank and asymmetrical drive, they eliminate the need for precise hole alignment and reduce operator fatigue. The corrosion-resistant properties make them suitable for outdoor equipment, marine components, and chemical processing plants, where moisture and corrosive agents are prevalent. By integrating high tensile strength and standardized dimensions, these screws minimize downtime and enhance the longevity of assembled products.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances per UNC standards, ensuring dimensional accuracy and interchangeability. Manufacturing follows ASME B18.3 specifications for consistent quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances. Thread size is 10-24 UNC with coarse spacing, and the length is precisely 1-1/4 inches for uniform performance across applications.