S-91771A558 1/4"-28 x 5/8" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel, ideal for harsh environments and long-term reliability.
• High tensile strength of 80,000 psi ensures dependable performance under heavy loads and mechanical stress.
• Precise Class 2A thread fit for smooth assembly and secure fastening in fine-thread applications.
• Standard 82° countersink angle allows for flush mounting, reducing snagging and improving aesthetics.
• Phillips No. 3 drive design provides efficient torque transfer and ease of installation with common tools.
• Full threading along the 5/8" length maximizes grip and holding power in various materials.
• Compliance with ASME B18.6.3 and environmental regulations guarantees quality, safety, and eco-friendly use.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 1/4"-28 UNF flat head Phillips screws in passivated 18-8 stainless steel address critical challenges like corrosion and vibration loosening. The fine UNF threads and Class 2A fit ensure tight, reliable connections in machinery, automotive assemblies, and electronic enclosures, reducing maintenance needs. With an 82° countersink angle and fully threaded design, they provide a low-profile, secure fastening solution that withstands harsh conditions, enhancing durability and operational efficiency in heavy-duty applications.

Specification Summary & Compliance

This screw adheres to ASME B18.6.3 standards, with precise Class 2A thread fit and UNF fine threading for consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring environmental safety and regulatory adherence in industrial use.