S-97763A354 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 with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh environments and reducing maintenance costs.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and vibration, minimizing failure risks.
• Precision Class 3A UNF fine thread fit provides secure, tight fastening with excellent engagement in tapped holes.
• Hex drive (5/32") design allows for easy installation and removal with standard tools, speeding up assembly processes.
• Rounded button head profile offers a low-profile, aesthetically pleasing finish that reduces snagging and improves safety.
• Full threading along the 5/8" length enables consistent grip and uniform stress distribution for enhanced joint integrity.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations for global use.

Professional Applications & Engineering Value

This Black-Oxide 18-8 Stainless Steel Rounded Head Screw is engineered to address common industrial challenges, such as corrosion in humid or chemical-exposed settings, thanks to its durable stainless steel core and protective coating. The Class 3A UNF fine thread and fully threaded design deliver precise, vibration-resistant connections in critical assemblies like machinery, automotive components, and electronic enclosures, where loosening can lead to operational failures. With a Rockwell B55 hardness and 70,000 psi tensile strength, it withstands high-stress conditions without deformation, making it a reliable choice for precision fasteners in manufacturing and maintenance applications. The hex drive and rounded head further simplify installation in tight spaces, boosting efficiency and reducing labor time.

Specification Summary & Compliance

This screw features a 1/4"-28 UNF fine thread with Class 3A fit for high precision and tight tolerances, ensuring consistent performance in threaded holes. It meets ASME B18.3 specifications for dimensional accuracy and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental standards for industrial use.