S-98164A539 3/8"-24 x 1 1/2" 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 and passivated finish, ideal for harsh chemical and marine environments
• Superior mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under high-stress conditions
• Precision fine threading with Class 3A fit ensures secure, vibration-resistant fastening in critical assemblies
• Optimized drive engagement through 7/32" hex drive design providing efficient torque transmission and reduced stripping risk
• Full-threaded length maximizes grip range and load distribution across the entire fastener
• Regulatory compliance meets ASME B18.3 manufacturing standards while satisfying RoHS 3 and REACH environmental directives
• Streamlined rounded head profile combines low-clearance design with enhanced aesthetic integration

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 316 stainless steel rounded head screws address critical challenges in chemical processing, marine equipment, and food manufacturing environments. The combination of UNF fine threading and Class 3A thread fit provides exceptional resistance to vibrational loosening while maintaining precise alignment in assembled components. The passivated surface treatment significantly enhances the natural corrosion resistance of 316 stainless steel, extending service life in aggressive media including chlorides and acidic solutions. With fully threaded construction and hex drive compatibility, these fasteners deliver consistent clamping force across the entire engagement length while accommodating standard industrial driving tools for efficient installation and maintenance.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread tolerances for precision fit. The 3/8"-24 UNF fine thread configuration ensures optimal performance in applications requiring fine adjustment capability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations confirms adherence to hazardous substance restrictions. Mechanical properties include 70,000 psi minimum tensile strength and Rockwell B55 hardness for consistent performance across industrial applications.