S-92949A882 1/2"-20 x 7/8" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish for long-term reliability in harsh environments
• Superior torque transmission through 5/16" hex drive design, preventing tool slippage during high-tension applications
• Precise thread engagement with Class 3A fine UNF threads ensuring secure, vibration-resistant connections
• High mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
• Streamlined installation with rounded button head profile that eliminates snagging and provides a finished appearance
• Maximum grip length through fully threaded design for superior holding power across the entire 7/8" length
• Regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial acceptance

Professional Applications & Engineering Value

These 1/2"-20 UNF rounded head screws provide engineering solutions where corrosion resistance and high tensile strength are critical. The 18-8 stainless steel composition with passivated finish ensures durability in chemical processing, marine, and food industry applications where moisture and corrosive agents are present. The Class 3A fine thread fit delivers precise engagement for vibration-prone machinery, while the hex drive configuration allows for high-torque installation without cam-out. The rounded button head design minimizes protrusion in confined spaces while maintaining structural integrity under 70,000 psi tensile loads, making these industrial screws ideal for heavy equipment assembly, structural frameworks, and precision manufacturing applications requiring reliable, long-lasting fastening solutions.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread fit precision and UNF fine threading (1/2"-20) for superior engagement. Compliant with ASME B18.3 specifications (ASTM F879) for dimensional accuracy and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The fully threaded 7/8" length provides consistent clamping force, while the 0.5" thread diameter and fine thread spacing optimize load distribution in critical applications.