S-98164A530 5/16"-24 x 1" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh chemical and marine environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under heavy loads
• Precision thread engagement with Class 3A fit and UNF fine thread profile ensuring secure fastening and vibration resistance
• Efficient installation with 3/16" hex drive and rounded button head design for easy access and reduced tool slippage
• Full thread coverage along the 1" length providing maximum grip and load distribution across connected components
• Regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe use in regulated industries
• Right-hand threading for standard installation procedures and compatibility with existing industrial equipment

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 316 stainless steel rounded head hex screws deliver exceptional performance in corrosive environments where standard fasteners fail. The combination of UNF fine threading and Class 3A thread fit provides superior vibration resistance and precise torque control, critical for machinery, marine equipment, and chemical processing systems. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, while the rounded button head profile with hex drive enables quick installation in confined spaces. These fully threaded screws maintain structural integrity under high-stress conditions, making them ideal for permanent installations requiring reliable, long-term fastening solutions in aerospace, automotive, and industrial manufacturing applications.

Specification Summary & Compliance

This 5/16"-24 x 1" screw features precision Class 3A thread fit with UNF fine thread profile and right-hand threading. Manufactured to ASME B18.3 specifications (ASTM F879) with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The screw maintains dimensional accuracy with 0.313" thread diameter, 0.547" head diameter, and 0.166" head height, ensuring consistent performance and interchangeability in industrial applications.