S-98164A912 1/4"-28 x 5/8" ASME B18.3 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 and passivated surface treatment
• Exceptional mechanical reliability with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precise thread engagement ensured by Class 3A UNF fine thread fit, reducing vibration loosening risks
• Efficient installation and removal with 5/32" hex drive design providing secure tool engagement
• Low-profile rounded head design offers clean aesthetics while minimizing snagging hazards
• Full threading along 5/8" length delivers maximum grip and load distribution across mating components
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

Engineered for critical industrial applications where corrosion resistance and mechanical integrity are paramount, these 316 stainless steel rounded head screws solve persistent challenges in chemical processing, marine equipment, and food manufacturing environments. The combination of UNF fine threading and Class 3A thread fit provides superior vibration resistance compared to coarse-thread alternatives, while the passivated finish enhances the natural corrosion resistance of 316 stainless steel, extending service life in chloride-exposed applications. The hex drive design ensures reliable torque transmission during installation, preventing tool slippage that can damage fastener heads in confined spaces. These fully threaded fasteners deliver consistent clamping force across the entire engagement length, making them ideal for precision assemblies requiring uniform stress distribution.

Specification Summary & Compliance

This 1/4"-28 x 5/8" rounded head screw features precision UNF fine threads with Class 3A fit tolerance for exacting dimensional requirements. Manufacturing conforms to ASME B18.3 specifications for consistent quality and interchangeability. The fastener is fully compliant with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, ensuring suitability for global industrial supply chains and environmentally conscious operations.