S-91781A535 1/4"-20 x 3/8" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Corrosion-resistant performance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Superior tensile strength rated at 80,000 psi ensures reliable fastening under high-stress industrial applications
• Precision thread engagement with Class 2A fit and UNC coarse threading provides consistent installation and vibration resistance
• Optimized flush mounting featuring 82° countersink angle and undercut head profile for seamless surface integration
• Enhanced durability with Rockwell B80 hardness maintains structural integrity through repeated use cycles
• Broad compliance coverage meeting ASME B18.6.3 specifications while adhering to RoHS 3 and REACH environmental regulations
• Universal compatibility through standardized 1/4"-20 UNC threading and slotted drive design for tooling flexibility

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 1/4"-20 UNC flat head screws deliver critical corrosion resistance through their 18-8 stainless steel composition and passivated finish, effectively preventing galvanic corrosion and chemical degradation. The fully threaded design with coarse spacing ensures maximum grip strength in soft materials and accelerated installation times. The undercut flat head profile combined with the standardized 82° countersink angle eliminates protrusion issues in precision machinery, automotive assemblies, and electrical enclosures where surface clearance is paramount. These industrial fasteners maintain Class 2A thread fit tolerances for consistent torque performance, reducing assembly variables in high-volume manufacturing operations while meeting rigorous ASME B18.6.3 mechanical specifications.

Specification Summary & Compliance

This flat head screw maintains precision Class 2A thread fit per UNC standards with coarse thread spacing for optimal engagement. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance adherence for global industrial applications.