S-91781A083 2-56 x 5/8" 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
• Exceptional mechanical strength delivering 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Precision thread engagement with Class 2A fit and UNC coarse threads ensuring smooth installation and vibration resistance
• Optimal flush mounting featuring standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced installation control through slotted drive compatibility with standard screwdrivers
• Full-threaded design providing maximum grip length and holding power across the entire fastener
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations for global industrial applications

Professional Applications & Engineering Value

These 2-56 UNC flat head slotted screws deliver critical performance advantages for precision assembly applications where corrosion resistance and flush surface requirements are paramount. The combination of 18-8 stainless steel material and passivated surface treatment provides exceptional protection against oxidation and chemical exposure in demanding environments such as electronic enclosures, instrumentation panels, and marine equipment. The fully threaded design with coarse thread spacing ensures maximum thread engagement in thin materials while the 82° countersink angle creates a secure, flush fit that prevents snagging and maintains aerodynamic or hygienic surfaces. These industrial screws solve common fastening challenges by offering reliable tensile strength while maintaining dimensional stability under thermal cycling and mechanical stress conditions.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC thread form ensuring interchangeability and consistent performance. Complies with ASME B18.6.3 mechanical standards for flat head screws, RoHS 3 (2015/863/EU) restrictions on hazardous substances, and REACH (EC 1907/2006) chemical safety regulations. The right-hand thread direction and coarse thread spacing provide industry-standard compatibility while the specified 5/8" length and 0.086" thread diameter maintain dimensional accuracy across production lots.