S-91781A076 2-56 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, ideal for harsh industrial environments
• Exceptional mechanical strength with 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 secure fastening and vibration resistance
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Broad compliance coverage meeting ASME B18.6.3 specifications plus RoHS 3 and REACH environmental regulations
• Full-threaded design providing maximum grip length and uniform stress distribution along the entire fastener
• Traditional slotted drive offering compatibility with standard screwdrivers for straightforward installation

Professional Applications & Engineering Value

These 2-56 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 finish creates a durable barrier against chemical exposure and atmospheric corrosion, extending service life in demanding environments. The Class 2A thread fit and coarse thread spacing ensure rapid installation while maintaining secure fastening integrity, reducing assembly time in high-volume production. The 82° countersink angle and flat head profile provide optimal seating in prepared holes, eliminating protrusions that could interfere with moving components or create safety hazards in machinery, electronic enclosures, and precision instrument manufacturing.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerances for consistent quality and interchangeability. Features UNC coarse threads (2-56 size) with right-hand direction and fully threaded design. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety. Dimensions include 0.162" head diameter, 0.051" head height, and 3/16" length for standardized application across industrial fastening requirements.