S-91781A190 8-32 x 1/4" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable, long-lasting fastening under high stress.
• Precision thread engagement with Class 2A thread fit and UNC coarse threads ensures easy installation and secure, vibration-resistant connections.
• Optimized flush mounting featuring an undercut flat head and 82° countersink angle for a smooth, unobtrusive finish in countersunk applications.
• Full regulatory compliance with ASME B18.6.3 manufacturing standards, RoHS 3, and REACH, guaranteeing safety and environmental responsibility.
• Versatile right-hand threading and fully threaded design for consistent holding power across the entire screw length in various materials.
• Easy manual installation with a slotted drive style, providing straightforward assembly without specialized tools.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 8-32 UNC flat head screws address critical challenges like corrosion, vibration loosening, and mechanical failure. The 18-8 stainless steel material, combined with a passivated finish, offers outstanding resistance to rust and chemicals, making them ideal for machinery, electronics, and outdoor equipment. The undercut flat head profile and precise coarse thread design ensure a flush fit and rapid installation, reducing assembly time while maintaining high tensile strength. This makes them a trusted choice for OEMs and maintenance teams seeking durable, compliant fasteners that minimize downtime and enhance product longevity in corrosive or high-stress environments.

Specification Summary & Compliance

This screw adheres to Class 2A thread fit tolerances and UNC coarse thread standards per ASME B18.6.3, ensuring dimensional accuracy and interchangeability. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances. The manufacturing process meets rigorous specifications for thread diameter (0.164"), length (1/4"), and countersink angle (82°), providing reliable performance in professional fastening systems.