S-91781A577 1/4"-20 x 6" 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, ideal for harsh industrial environments
• High tensile strength of 80,000 psi ensures reliable performance in heavy-duty applications and structural assemblies
• Class 2A thread fit with UNC coarse threading provides consistent engagement and easier installation in various materials
• Standard 82° countersink angle enables flush mounting for clean, professional finishes in visible applications
• Partially threaded design offers optimal clamping force control while maintaining unthreaded shank strength
• Slotted drive compatibility allows for straightforward installation with common tools in maintenance and assembly
• Full regulatory compliance with ASME B18.6.3, RoHS 3, and REACH ensures material safety and international acceptance

Professional Applications & Engineering Value

This 1/4"-20 x 6" flat head screw delivers exceptional engineering value through its 18-8 stainless steel composition and passivated finish, specifically engineered to combat corrosion in demanding environments like marine equipment, food processing machinery, and outdoor structures. The UNC coarse threading with Class 2A fit ensures rapid installation and vibration resistance in assembly lines, while the partially threaded configuration provides precise clamping control for machinery frames and structural components. The 82° countersink angle and slotted drive design facilitate seamless integration in applications requiring flush surfaces and accessibility, making it ideal for industrial maintenance, manufacturing equipment, and infrastructure projects where reliability and regulatory compliance are paramount.

Specification Summary & Compliance

This flat head screw maintains precise dimensional accuracy with Class 2A thread fit and UNC 1/4"-20 coarse thread spacing, manufactured to ASME B18.6.3 specifications for consistent performance. The product fully complies with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, ensuring environmental responsibility and global market acceptance.