S-98164A697 5/16"-18 x 3/8" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction with passivated surface treatment
• Exceptional thread reliability with Class 3A fit UNC coarse threading ensuring secure fastening in demanding applications
• High mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty performance
• Optimized installation efficiency through hex drive design providing positive torque transmission and reduced slipping
• Full regulatory compliance meeting ASME B18.3 standards while being RoHS 3 and REACH compliant for global applications
• Versatile rounded head design offering low-profile installation with standard button head profile for space-constrained assemblies
• Complete threading coverage along the 3/8" length ensuring maximum engagement strength in various material thicknesses

Professional Applications & Engineering Value

This 316 stainless steel rounded head screw addresses critical industrial challenges where corrosion resistance and mechanical reliability are paramount. The combination of UNC coarse threading with Class 3A fit provides superior vibration resistance in dynamic applications while the passivated finish enhances protection against chemical exposure and atmospheric corrosion. Engineered for heavy-duty industrial fastening in marine, chemical processing, and food equipment applications, the hex drive configuration ensures secure installation without cam-out issues. The fully threaded design maintains consistent clamping force across varying material thicknesses, making these button head screws ideal for machinery assembly, structural frameworks, and equipment requiring frequent maintenance access.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit per UNC specifications, ensuring tight tolerances for reliable performance. The screw meets ASME B18.3 manufacturing standards while maintaining full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Thread specifications include 5/16"-18 UNC coarse threading with right-hand direction, complemented by a 3/8" fully threaded length and hex drive (3/16") configuration for standardized installation procedures.