S-91781A266 2-56 x 1 1/4" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish for extended service life in harsh environments
• High tensile strength of 80,000 psi ensures reliable fastening under substantial mechanical loads
• Precision Class 2A thread fit provides smooth assembly and consistent engagement with mating components
• 82° countersink angle and standard flat head profile enable flush mounting for streamlined surfaces
• Coarse UNC threading facilitates quick installation and reduces cross-threading risks
• Full threading along the 1-1/4" length offers maximum grip and adjustability in various material thicknesses
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality, safety, and environmental responsibility

Professional Applications & Engineering Value

These 2-56 UNC flat head slotted screws are engineered to address critical industrial fastening challenges. The 18-8 stainless steel construction, combined with a passivated finish, provides exceptional resistance to oxidation and chemical exposure, making them ideal for applications in machinery, electronics, and outdoor equipment where durability is paramount. The flat head design with 82° countersink ensures a secure, flush fit that minimizes protrusion risks in tight spaces. With coarse thread spacing and Class 2A thread fit, these screws reduce installation time and prevent stripping in soft or brittle materials. Fully threaded along the entire 1-1/4" length, they deliver uniform clamping force and versatility across varying assembly depths, supporting efficient production and long-term reliability in demanding industrial applications.

Specification Summary & Compliance

This product features a 2-56 UNC coarse thread with Class 2A tolerance for precise fit, right-hand thread direction, and a standard flat head profile. Manufacturing adheres to ASME B18.6.3 specifications, ensuring dimensional accuracy and performance consistency. The screws are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming they are free of restricted hazardous substances and safe for use in regulated industries.