S-98164A540 1/2"-13 x 3/4" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
• High-strength performance offering 70,000 psi tensile strength for reliable load-bearing in demanding applications
• Precise thread engagement with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance
• Enhanced durability through passivated surface treatment that improves corrosion protection and extends service life
• Efficient installation with 5/16" hex drive providing positive torque transmission and reduced tool slippage
• Full threading capability allowing complete engagement along the entire 3/4" length for maximum holding power
• Regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for quality assurance and environmental safety

Professional Applications & Engineering Value

These 316 stainless steel rounded head screws deliver critical performance advantages in challenging industrial settings where corrosion resistance and mechanical reliability are paramount. The combination of UNC coarse threading and Class 3A thread fit provides superior vibration resistance in machinery, equipment assembly, and structural applications. The passivated finish significantly enhances the natural corrosion resistance of 316 stainless steel, making these hex drive screws ideal for chemical processing, marine hardware, food processing equipment, and outdoor installations exposed to weather elements. With their fully threaded design and 70,000 psi tensile strength, they ensure consistent clamping force distribution and reliable performance in high-stress applications where fastener failure is not an option.

Specification Summary & Compliance

This 1/2"-13 x 3/4" rounded head screw features precision UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufacturing complies with ASME B18.3 specifications (ASTM F879) ensuring consistent quality and interchangeability. The component is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting the latest environmental regulations for hazardous substances. Material hardness is certified at Rockwell B55, providing optimal balance between strength and machinability for industrial fastening requirements.