S-98164A213 1/4"-20 x 3/4" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments due to 316 stainless steel construction with passivated finish
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precision thread engagement ensured by Class 3A thread fit and UNC coarse threading for reliable fastening
• Easy installation and removal with 5/32" hex drive design and fully threaded length
• Low-profile rounded head provides smooth finish while maintaining structural integrity
• Regulatory compliance meets ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
• Versatile application capability across industries requiring chemical resistance and durable fastening solutions

Professional Applications & Engineering Value

These 316 stainless steel rounded head screws with 1/4"-20 UNC coarse threading deliver exceptional performance in corrosive environments where chemical resistance is critical. The passivated finish enhances surface protection while maintaining the material's inherent corrosion-resistant properties. The hex drive design ensures secure tool engagement during installation, preventing stripping and providing consistent torque application. With fully threaded construction and Class 3A thread fit, these fasteners offer reliable clamping force distribution and vibration resistance in industrial equipment, marine applications, chemical processing systems, and food processing machinery where exposure to moisture, chemicals, and extreme conditions demands superior fastener performance and longevity.

Specification Summary & Compliance

This 1/4"-20 UNC rounded head screw features precision Class 3A thread fit with coarse threading for optimal engagement. Manufacturing complies with ASME B18.3 standards (ASTM F879) ensuring dimensional accuracy and performance reliability. The fastener meets RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) compliance for chemical safety. With 3/4" length and fully threaded design, these screws maintain consistent mechanical properties throughout their specification range.