S-98164A448 8-32 x 5/16" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Enhanced durability through passivated surface finish that increases corrosion protection and extends service life
• Precise thread engagement with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance
• Easy installation and removal with 3/32" hex drive providing positive torque transmission and reduced tool slippage
• Full threading capability allowing complete penetration through materials for maximum holding power
• Regulatory compliance meeting ASME B18.3 standards and environmental regulations including RoHS and REACH

Professional Applications & Engineering Value

This 8-32 UNC 316 stainless steel rounded head screw delivers critical performance advantages in demanding industrial settings where corrosion resistance and mechanical reliability are paramount. The combination of 316 stainless steel material and passivated finish provides exceptional protection against chloride-induced stress corrosion cracking, making these hex drive screws ideal for chemical processing equipment, marine hardware, and food processing machinery. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of cross-threading while maintaining vibration resistance in dynamic applications. The rounded button head profile offers a low-profile installation with improved aesthetic appeal, while the coarse UNC threading facilitates quicker assembly in production environments. These fully threaded screws distribute clamping force evenly across the entire fastener length, preventing joint relaxation under thermal cycling and mechanical stress.

Specification Summary & Compliance

This high-performance rounded head screw features precise 8-32 UNC coarse threading with Class 3A thread fit tolerance for superior engagement. Manufacturing complies with ASME B18.3 specifications ensuring dimensional accuracy and interchangeability. The fastener meets stringent environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, confirming the absence of restricted substances. With dimensions of 5/16" length, 0.312" head diameter, and 3/32" hex drive size, this screw delivers reliable performance in critical applications requiring corrosion resistance and mechanical integrity.