S-92210A582 5/16"-18 x 1 1/8" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, heavy-duty fastening
• Precise thread engagement with Class 3A thread fit ensuring secure, vibration-resistant connections in critical applications
• Easy installation and removal with 3/16" hex drive and standard 82° countersink angle for flush mounting
• Full-length threading provides maximum grip and load distribution across the entire fastener length
• Industry-standard compliance with ASME B18.3 specifications and RoHS/REACH environmental regulations
• Optimized for coarse threading applications with 5/16"-18 UNC threads offering quick assembly and superior performance in softer materials

Professional Applications & Engineering Value

This 18-8 stainless steel flat head screw delivers critical performance advantages in demanding industrial settings. The combination of Class 3A thread fit and coarse UNC threading ensures rapid installation while maintaining vibration resistance in machinery, equipment frames, and structural assemblies. The passivated finish significantly enhances corrosion protection, making these hex drive screws ideal for manufacturing environments, outdoor equipment, and applications exposed to moisture or chemicals. With full threading and 82° countersink, these fasteners provide flush mounting solutions for sheet metal, wood, and composite materials while distributing clamping forces efficiently. The 70,000 psi tensile strength guarantees reliable performance in high-stress applications where fastener failure is not an option.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 standards, this flat head screw features 5/16"-18 UNC coarse threading with precision Class 3A thread fit for superior dimensional accuracy. The fastener meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, ensuring environmental responsibility. With fully threaded design and standard 82° countersink angle, this screw delivers consistent performance across industrial applications while maintaining strict quality control throughout manufacturing.