S-91781A143 6-32 x 3/16" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• High mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness to withstand demanding industrial loads
• Precision thread engagement with Class 2A fit and UNC coarse threads for reliable fastening and reduced cross-threading risk
• Flush mounting capability featuring an undercut flat head with 82° countersink angle for seamless surface integration
• Full threading design ensures maximum grip length and uniform stress distribution across the entire fastener
• Regulatory compliance with ASME B18.6.3 manufacturing standards and environmental directives (RoHS 3/REACH)
• Right-hand thread direction provides standardized installation compatible with common assembly tools and procedures

Professional Applications & Engineering Value

These 6-32 UNC flat head screws deliver critical performance advantages in precision assembly applications where surface flushness and corrosion resistance are paramount. The 18-8 stainless steel composition combined with passivated surface treatment creates a protective oxide layer that significantly extends service life in moist or chemically aggressive environments. The undercut flat head profile with 82° countersink angle ensures complete seating below surface level, eliminating protrusion issues in machinery, electronic enclosures, and precision instruments. With fully threaded construction and coarse UNC threads, these fasteners provide superior pull-out resistance while enabling rapid installation in sheet metal, plastic components, and industrial equipment where vibration resistance and long-term reliability are essential.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance ensuring precise dimensional accuracy. Features 6-32 UNC coarse threads with right-hand direction and full threading along the 3/16" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making these screws suitable for global industrial applications with strict material restrictions.